Freescale Semiconductor MPC8260 L, M

MPC8260 PowerQUICC II Family Reference Manual, Rev. 2

Freescale Semiconductor Glossary-5

Interrupt. An asynchronous exception. On PowerPC processors, interrupts are a special

case of exceptions.

n

of a word

corresponds to the least-significant byte. In an addressed memory word, the bytes

are ordered (left to right) 3, 2, 1, 0, with 3 being the most-significant byte.

See

Big-endian.

MMaster. The name given to a bus device that has been granted control, or mastership, of the

bus.

Memory access ordering. The specific order in which the processor performs load and

store memory accesses and the order in which those acces ses complete.

Memory controller. A unit whose primary function is to control the external bus memories

and I/O devices.

Memory coherency. An aspect of caching in which it is ensured that an accurate view of

memory is provided to all devices that share system memory.

Memory consistency. Refers to agreement of levels of memory with respect to a single

processor and system memory (for example, on-chip cache, secondary cache, and

system memory).

Memory management unit (MMU). The functional unit that is capable of translating an

effective (logical) address to a physical address, providing protection

mechanisms, and defining caching methods.

Microarchitecture. The hardware details of a microprocessor’s design. Such details are

not defined by the PowerPC architecture.

Mnemonic. The abbreviated name of an instruction used for coding.

Modified state. When a cache block is in the modified state, it has been modified by the

processor since it was copied from memory.

See

MESI.

Contents

Main Document Number: MPC8260RM Rev. 2, 12/2005 How to Reach Us: Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page About This Book Reference Manual Revision History MPC8260 Family Reference Manual Tablei. Changes to , Rev. 1 Errata to MPC8260 Users Manual Tableii. Device- and Silicon-Specific Notations Before Using this ManualImport ant Note Audience Organization Page Page Architecture Documentation Page Page Page Page PowerPC Architecture Terminology Conventions Tabl e v describes instruction field notation conventions used in this manual. Tableiv. Terminology Conventions Tablev. Instruction Fiel d Conventions Page Part I Overview Tabl e I-1 contains acronyms and abbreviations that are used in this document. TableI-1. Acronyms and Abbreviated Terms TableI-1 . Acronyms and Abbreviated Terms (co ntinued) Page Chapter 1 Overview 1.1 Features Page Page Page Page 1.2 Architecture Overview Freescale Semiconductor 1-7 Figure 1-1. PowerQUICC II Block Diagram 1.2.1 G2 Core Notes: 1.2.2 System Interface Unit (SIU) 1.2.3 Communications Processor Module (CPM) 1.3 Software Compatibility Issues 1.3.1 Signals Page 1.4 Differences between MPC860 and PowerQUICC II 1.5 Serial Protocol Table 1.6 PowerQUICC II Configurations 1.6.1 Pin Configurations 1.6.2 Serial Performance 1.7 Application Examples 1.7.1 Communication Systems 1.7.1.1 Remote Access Server Page 1.7.1.2 Regional Office Router 1.7.1.3 LAN-to-WAN Bridge Router Figure 1-5. LAN-to-WAN Bridge Router Configurat ion 1.7.1.4 Cellular Base Station Figure 1-6. Cellular Base Station Configuration 1.7.1.5 Telecommunications Switch Controller 1.7.1.6 SONET Transmission Controller 1.7.2 Bus Configurations 1.7.2.1 Basic System Figure 1-9. Basic System Configuration Figure 1-10. High-Performance Communication 1.7.2.2 High-Performance Communication Figure 1-10 shows a high-performance communication configuration. 1.7.2.3 High-Performance System Microprocessor 1.7.2.4 PCI Figure 1-12. PCI Configuration 1.7.2.5 PCI with 155-Mbps ATM Figure 1-13 shows the PCI with 155-Mbps ATM configuration (MPC8265 and MPC8266 only). Figure 1-13. PCI with 155-Mbps ATM Configuration 1.7.2.6 PowerQUICC II as PCI Agent Page Chapter 2 G2 Core 2.1 Overview Figure 2-1. PowerQUICC II Integrated Processor Core Block Diagram 2.2 G2 Processor Core Features Page 2.2.1 Instruction Unit 2.2.2 Instruction Queue and Dispatch Unit 2.2.3 Branch Processing Uni t (BPU) 2.2.4 Independent Execution Units 2.2.4.1 Integer Unit (IU) 2.2.4.2 Floating-Point Unit (FPU) 2.2.4.3 Load/Store Unit (LSU) 2.2.4.4 System Register Unit (SRU) 2.2.5 Completion Unit 2.2.6 Memory Subsystem Support 2.2.6.1 Memory Management Units (MMUs) 2.2.6.2 Cache Units 2.3 Programming Model 2.3.1 Register Se t 2.3.1.1 PowerPC Register Set Figure 2-2. PowerQUICC II Programming ModelRegisters 2.3.1.2 PowerQUICC II-Specific Registers Page Page G2 Core Reference Manual Figure 2-4. Hardware Implementation-Dependent Register 1 (HID1) Table2-2. HID1 Field Descriptions Figure 2-5. Hardware Implementation-Dependent Register 2 (HID2) Table2-3. HID2 Field Descriptions 2.3.2 PowerPC Instruction Set and Addressing Modes 2.3.2.1 Calculating Effective Addresses 2.3.2.2 PowerPC Instruction Set 2.3.2.3 PowerQUICC II Implementation-Specific Instruction Set 2.4 Cache Implementation 2.4.1 PowerPC Cache Model 2.4.2 PowerQUICC II Implementation-Specific Cach e Implementation 2.4.2.1 Data Cache Page 2.4.2.2 Instruction Cache 2.4.2.3 Cache Locking 2.5 Exception Model 2.5.1 PowerPC Exceptio n Model 2.5.2 PowerQUICC II Implementation-Specific Exceptio n Model MPC603e Users Manual Table2- 5. Exceptions and Conditio ns (continued) 2.5.3 Exception Priorities 2.6 Memory Management 2.6.1 PowerPC MMU Model 2.6.2 PowerQUICC II Implementation-Specific MMU Features 2.7 Instruction Timing 2.8 Differences between the PowerQUICC IIs G2 Core and the MPC603e Microprocessor MPC603e Users Manual MPC603e Users Manual Table2-7. Major Differences between PowerQUICC IIs G2 Core and the Chapter 3 Memory Map Table3-1. Internal Memory Map Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Part II Configuration and Reset Page Chapter 4 System Interface Unit (SIU) 4.1 System Configuration and Protection 4.1.1 Bus Monitor 4.1.2 Timers Clock 4.1.3 Time Counter (TMCNT) 4.1.4 Periodic Interrupt Timer (PIT) 4.1.5 Software Watchdog Timer 4.2 Interrupt Controller 4.2.1 Interrupt Configuration Figure 4-8. PowerQUICC II Interrupt Structure 4.2.1.1 Machine Check Interrupt 4.2.1.2 INT Interrupt 4.2.2 Interrupt Source Priorities Table4-2. Interrupt Source Priority Levels Table4-2. In terrupt Source Priority Levels (continued) 4.2.2.1 SCC, FCC, and MCC Relative Priority 4.2.2.2 PIT, TMCNT, PCI, and IRQ Relative Priority 4.2.2.3 Highest Priority Interrupt 4.2.3 Masking Interrupt Sources Figure 4-9. Interrupt Request Masking 4.2.4 Interrupt Vector Generation and Calculation Table4- 3. Encoding the Interrupt Vector Table4- 3. Encoding the Interrupt Vector (continued) 4.2.4.1 Port C External Interrupts 4.3 Programming Model 4.3.1 Interrupt Controller Registers 4.3.1.1 SIU Interrupt Configuration Register (SICR) The SICR register bits are described in Table 4 -4. 4.3.1.2 SIU Interrupt Priority Register (SIPRR) Figure 4-11. SIU Interrupt Priority Register (SIPRR) The SIPRR register bits are described in Table 4- 5. Table4-4. SICR Field Descriptions 4.3.1.3 CPM Interrupt Priority Registers (SCPRR_H and SCPRR_L) Figure 4-12. CPM High Interrupt Priority Register (SCPRR_H) Tabl e 4-6 describes SCPRR_H fields. Table4-5. SIPRR Field Descriptions Tabl e 4-7 describes SCPRR_L fields. Table4-6. SCPRR_H Field Descriptions Figure 4-13. CPM Low Interrup t Priority Register (SCPRR_L) 4.3.1.4 SIU Interrupt Pending Registers (SIPNR_H and SIPNR_L) Figure 4-14. SIPNR_H Figure 4-15 shows SIPNR_L fields. Table4-7. SCPRR_L Field Descriptions 4.3.1.5 SIU Interrupt Mask Registers (SIMR_H and SIMR_L) Page 4.3.1.6 SIU Interrupt Vector Register (SIVEC) Figure 4-19. Interrupt Table Handling Example 4.3.1.7 SIU External Interrupt Control Register (SIEXR) Tabl e 4-8 describes SIEXR fields. 4.3.2 System Configuration and Protection Registers The system configuration and protection registers are described in the following sections. 4.3.2.1 Bus Configuration Register (BCR) Figure 4-20. SIU External Interrupt Control Register (SIEXR) Table4- 8. SIEXR Field Descriptions Figure 4-9 describes BCR fields. Figure 4-21. Bus Configuration Register (BCR) Table4-9. BCR Field Descriptions Table4- 9. BCR Field Descriptions ( continued) 4.3.2.2 60x Bus Arbiter Configuration Register (PPC_ACR) Figure4-22. PPC_ACR Table4-10 describes PPC_ACR fields. Table4- 9. BCR Field Descriptions ( continued) 4.3.2.3 60x Bus Arbitration-Level Registers (PPC_ALRH/PPC_ALRL) Figure 4-23. PPC_ALRH Table4-10. PPC_ACR Field Descriptions 4.3.2.4 Local Bus Arbiter Configuration Register (LCL_ACR) Table4-11 describes LCL_ACR register bits. Figure 4-24. PPC_ALRL Figure 4-25. LCL_ACR Table4-11. LCL_ACR Field Descriptions 4.3.2.5 Local Bus Arbitration Level Registers (LCL_ALRH and LCL_ACRL) Figure4-26. LCL_ALRH Table4-11. LCL_ACR Field Descriptions (continued) 4.3.2.6 SIU Module Configuration Register (SIUMCR) Table4-12 describes SIUMCR fields. Figure 4-27. LCL_ALRL Figure4-28. SIU Model Configuration Register (SIUMCR) Table4-12. SIUMCR Register Field Descriptions Page Table4-12. SIUMCR Register Field Descriptions (continued) 4.3.2.7 Internal Memory Map Register (IMMR) 4.3.2.8 System Protection Control Register (SYPCR) Figure 4-30. System Protection Control Register (SYPCCR) Table4-13. IMMR Field Descriptions Table4-14 describes SYPCR fields. 4.3.2.9 Software Service Register (SWSR) The 60x bus transfer error status and control register 1 (TESCR1) is shown in Figure 4-31. 4.3.2.10 60x Bus Transfer Error Status and Control Register 1 (TESCR1) Table4-14. SYPCR Field Descriptions Table4-15 describes TESCR1 fields. 4.3.2.11 60x Bus Transfer Error Status and Control Register 2 (TESCR2) The 60x bus transfer error status and control register 2 (TESCR2) is shown in Figure 4-32. Table4-15. TESCR1 Field Descriptions (continued) The TESCR2 register is described in Table 4-16. 4.3.2.12 Local Bus Transfer Error Status and Control Register 1 (L_TESCR1) The local bus transfer error status and control register 1 (L_TESCR1) is shown in Figure4-33. The L_TESCR1 register bits are described in Table4-17. 4.3.2.13 Local Bus Transfer Error Status and Control Register 2 (L_TESCR2) The local bus transfer error status and control register 2 (L_TESCR2) is shown in Figure4-34. Table4-18 describes L_TESCR2 fields. Table4-17. L_TESCR1 Field Descriptions (continued) 4.3.2.14 Time Counter Status and Control Register (TMCNTSC) Table4-19 describes TMCNTSC fields. 4.3.2.15 Time Counter Register (TMCNT) 4.3.2.16 Time Counter Alarm Register (TMCNTAL) Table4-20 describes TMCNTAL fields. Figure 4-36. Time Counter Register (TCMCNT) Figure 4-37. Time Counter Alarm Register (TMCNTAL) Table4-20. TMCNTAL Field Descriptions 4.3.3 Periodic Interrupt Registers 4.3.3.1 Periodic Interrupt Status and Control Register (PISCR) 4.3.3.2 Periodic Interrupt Timer Count Register (PITC) Table4-22 describes PITC fields. 4.3.3.3 Periodic Interrupt Timer Register (PITR) Figure4-40. Periodic Interrupt Timer Register (PITR) Figure 4-39. Periodic interrupt Time r Count Register (PITC) Table4-22. PITC Field Descriptions 4.3.4 PCI Control Registers 4.3.4.1 PCI Base Register (PCIBRx) Table4-24 describes PCIBRx fields. 4.3.4.2 PCI Mask Register (PCIMSKx) Figure 4-42 shows the PCI mask register. 4.4 SIU Pin Multiplexing Table4-24. PCIBRx Field Descriptions Table4-25. PCIM SKx Field Descriptions 4-50 Freescale Semiconductor Table4-26. SIU Pins Multiplexing Control Pin Name Pin Configuration Control Chapter 5 Reset 5.1 Reset Causes 5.1.1 Reset Actions 5.1.2 Power-On Reset Flow 5.1.3 HRESET Flow 5.1.4 SRESET Flow 5.2 Reset Status Register (RSR) Tabl e 5-3 describes RSR fields. Figure 5-2. Reset Status Register (RSR) Table5-3. RSR Field Descriptions 5.3 Reset Mode Register (RMR) 5.4 Reset Configuration Page 5.4.1 Hard Reset Configuration Word The contents of the hard reset configuration word are shown in Figure5-4. n_nnnn nnnnn Tabl e 5-7 describes hard reset configuration word fields. Table5- 7. Hard Reset Configuration Word Field Descriptions (cont inued) 5.4.2 Hard Reset Configuration Examples 5.4.2.1 Single PowerQUICC II with Default Configuration 5.4.2.2 Single PowerQUICC II Configured from Boot EPROM 5.4.2.3 Multiple PowerQUICC IIs Configured from Boot EPROM Figure5-7. Configuring Multiple Chips 5.4.2.4 Multiple PowerQUICC IIs in a System with No EPROM Page Part III The Hardware Interface Page Page TableIII-1. Acronyms and Abbreviated Terms (continued) Chapter 6 External Signals 6.1 Functional Pinout 6.2 Signal Descriptions Table6-1 . External Signals Page Page Page Page Page Page Page Page Page Page Page Page Page Chapter 7 60x Signals 7.1 Signal Configuration Figure shows the grouping of the PowerQUICC IIs 60x bus signal configuration. Figure 7-1. Signal Groupings 7.2 Signal Descriptions 7.2.1 Address Bus Arbitration Sig nals 7.2.1.1 Bus Request (BR)Output 7.2.1.2 Bus Grant (BG) 7.2.1.3 Address Bus Busy (ABB) 7.2.2 Address Transfer Start Signal 7.2.2.1 Transfer Start (TS) 7.2.2.2 Transfer Start (TS)Input 7.2.3 Address Transfer Signals 7.2.3.1 Address Bus (A[031]) 7.2.4 Address Transfer Attribute Signals 7.2.4.1 Transfer Type (TT[04]) 7.2.4.2 Transfer Size (TSIZ[03]) 7.2.4.3 Transfer Burst (TBST) 7.2.4.4 Global (GBL) 7.2.4.5 Caching-Inhibited (CI)Output 7.2.4.6 Write-Through (WT)Output 7.2.5 Address Transfer Termination Sig nals 7.2.5.1 Address Acknowledge (AACK) 7.2.5.2 Address Retry (ARTRY) 7.2.6 Data Bus Arbitration Signals 7.2.6.1 Data Bus Grant (DBG) 7.2.6.2 Data Bus Busy (DBB) 7.2.7 Data Transfer Signals 7.2.7.1 Data Bus (D[063]) 7.2.7.2 Data Bus Parity (DP[07]) 7.2.8 Data Transfer Termination Sig nals 7.2.8.1 Transfer Acknowledge (TA) Page 7.2.8.2 Transfer Error Acknowledge (TEA) 7.2.8.3 Partial Data Valid Indication (PSDVAL) Page Page Chapter 8 The 60x Bus 8.1 Terminology 8.2 Bus Configuration 8.2.1 Single-PowerQUICC II Bus Mode 8.2.2 60x-Compatible Bus Mode Figure 8-2. 60x-Compatible Bus Mode 8.3 60x Bus Protocol Overview 8.3.1 Arbitration Phase 8.3.2 Address Pipelining and Split-Bus Transactions 8.4 Address Tenure Operations 8.4.1 Address Arbitration 8.4.2 Address Pipelining 8.4.3 Address Transfer Attribute Signals 8.4.3.1 Transfer Type Signal (TT[04]) Encoding Table 8-2. Tran sfer Type Enco din g Regarding Tabl e 8-2: Table8-2. Transfer Type Encoding (continued) 8.4.3.2 Transfer Code Signals TC[02] 8.4.3.3 TBST and TSIZ[03] Signals and Size of Transfer 8.4.3.4 Burst Ordering During Data Transfers Each data beat is terminated with an assertion of TA. 8.4.3.5 Effect of Alignment on Data Transfers Table8-5. Burst Ordering Table 8-6. Aligned Da ta Transfers Page 8.4.3.6 Effect of Port Size on Data Transfers Figure 8-6. Interface to Different Port Size Devices 8.4.3.7 60x-Compatible Bus ModeSize Calculation Table8-8. Data Bus: Rea d Cycle Requirements and Write Cycle Content 8.4.3.8 Extended Transfer Mode Table8-9. Address and Size State Calculations Table8-10. Data Bus Contents for Extended Write Cycles Table8-11. Data Bus Requirements for Extended Read Cycles Table8-12. Address and Size State for Extended Transfers 8.4.4 Address Transfer Termination 8.4.4.1 Address Retried with ARTRY Page 8.4.4.2 Address Tenure Timing Configuration 8.4.5 Pipeline Control 8.5 Data Tenure Operations 8.5.1 Data Bus Arbitra tion 8.5.2 Data Streaming Mode 8.5.3 Data Bus Transfers and Normal Termination 8.5.4 Effect of ARTRY Assertion on Data Transfer and Arbi tration 8.5.5 Port Size Data Bus Transfers and PSDVAL Termination Figure 8-9. 28-Bit Extended Transfer to 32-Bit Port Size 8.5.6 Data Bus Termination by Assertion o f TEA 8.6 Memory CoherencyMEI Protocol 8.7 Processor State Signals 8.7.1 Support for the lwarx/stwcx. Inst ruction Pair 8.7.2 TLBISYNC Input 8.8 Little-Endian Mode Chapter 9 PCI Bridge Figure9-1. PCI Bridge in the PowerQUICC II Figure 9-2. PCI Bridge Structure 9.1 Signals 9.2 Clocking 9.3 PCI Bridge Initialization 9.4 SDMA Interface 9.5 Interrupts from PCI Bridge 9.6 60x Bus Arbitration Priority 9.7 60x Bus Maste rs 9.8 CompactPCI Hot Swap Specification Support 9.9 PCI Interface 9.9.1 PCI Interface Operation 9.9.1.1 Bus Commands 9.9.1.2 PCI Protocol Fundamentals Table9- 2. PCI Command Definitions Page 9.9.1.3 Bus Transactions Page Page Page 9.9.1.4 Other Bus Operations Page Page Page 9.9.1.5 Error Functions Page 9.9.2 PCI Bus Arbitration 9.9.2.1 Bus Parking 9.9.2.2 Arbitration Algorithm 9.9.2.3 Master Latency Timer 9.10 Address Map Page Page 9.10.1 Address Map Programming 9.10.2 Address Translation 9.10.2.1 PCI Inbound Translation 9.10.2.2 PCI Outbound Translation 9.10.3 SIU Registers 9.11 Configuration Registers 9.11.1 Memory-Mapped Configuration Registers Page Table9-3. Internal Memory Map (continued) 9.11.1.1 Message Unit (I2O) Registers 9.11.1.2 DMA Controller Registers 9.11.1.3 PCI Outbound Translation Address Registers (POTAR ) 9.11.1.4 PCI Outbound Base Address Registers (POBAR ) 9.11.1.5 PCI Outbound Comparison Mask Registers (POCMR ) Figure 9-19. PCI Outbound Comparison Mask Registers (POCMR 9.11.1.6 Discard Timer Control Register (PTCR) Field Descriptions Figure 9-20. Discard Timer Control register (PTCR) Table9-7. describes PTCR fields. 9.11.1.7 General Purpose Control Register (GPCR) Table9-7. PTCR Field Descriptions Figure9-21. General Purpose Control Register (GPCR) Table9-8. describes GPCR fields. Table9- 8. GPCR Field Descriptions 9.11.1.8 PCI General Control Register (PCI_GCR) Figure 9-22. PCI General Control Register (PCI_GCR) Table9-9. describes PCI_GCR fields. 9.11.1.9 Error Status Register (ESR) Table9- 9. PCI_GCR Field Descriptions Table9-10. describes ESR fields. Table9- 10. ESR Field Descriptions 9.11.1.10 Error Mask Register (EMR) Table9-11. describes EMR fields. Figure 9-24. Error Mask Register (EMR) Table9-11. EMR Field Descriptions Table9-10. ESR F ield Descriptions (continued) 9.11.1.11 Error Control Register (ECR) Table9-12 describes ECR fields. Figure 9-25. Error Control Registe r (ECR) Table9-11. EMR Field Descriptions (continued) 9.11.1.12 PCI Error Address Capture Register (PCI_EACR) Table9-13. describes PCI_EACR f ields. Figure9-26. PCI Error Address Capture Register (PCI_EACR) Table9-12. ECR Field De scriptions 9.11.1.13 PCI Error Data Capture Register (PCI_EDCR) 9.11.1.14 PCI Error Control Capture Register (PCI_ECCR) Figure 9-28. PCI Error Control Capture Register (PCI_ECCR) Table9-15 describes PCI_ECCR fields. Table9-15. PCI_ECCR Field Descriptions Table9-10 9.11.1.15 PCI Inbound Translation Address Registers (PITAR ) Table 9-1 6. PI TAR 9.11.1.16 PCI Inbound Base Address Registers (PIBAR Figure 9-29. PCI Inbound Translation Address Registers (PITAR 9.11.1.17 PCI Inbound Comparison Mask Registers (PICMR ) Figure 9-31. PCI Inbound Comparison Mas k Registers (PICMR Table9-18. describes PICMRx. Table9-18. PICMR x) x 9.11.2 PCI Bridge Configuration Registers Figure9-32. PCI Bridge PCI Configuration Registers 9.11.2.1 Vendor ID Register Figure 9-33 and Table9-20 describe the vendor ID register. Table9-19. PCI Bridge PCI Configuration Registers (continued) Figure 9-33. Vendor ID Register 9.11.2.2 Device ID Register Figure 9-35. PCI Bus Command Register Figure 9-34 and Table9-21 describes the device ID register. Figure 9-34. Device ID Register 9.11.2.3 PCI Bus Command Register 9.11.2.4 PCI Bus Status Register Table9-22. PCI B us Command Register Description Figure 9-36. PCI Bus Status Register Table9-23. describes the PCI bus status register fields. 9.11.2.5 Revision ID Register Figure 9-37 and Table9-24 describe the revision ID register. Table9-23. PCI Bus Status Register Description Figure 9-37. Revision ID Register 9.11.2.6 PCI Bus Programming Interface Register Figure 9-38 and Table9-25 describe the PCI bus pr ogramming interface register. Figure 9-39 and Table9-26 describe the subclass code register. Figure 9-38. PCI Bus Programming Interface Register 9.11.2.7 Subclass Code Register 9.11.2.8 PCI Bus Base Class Code Register 9.11.2.9 PCI Bus Cache Line Size Register Figure 9-41. PCI Bus Cache Line Size Register 9.11.2.10 PCI Bus Latency Timer Register Figure 9-42 and Table9-29 describe the PCI bus latency timer register. Figure 9-43 and Table9-30 describe the header type register. Figure 9-42. PCI Bus Latency Timer Register 9.11.2.11 Header Type Register 9.11.2.12 BIST Control Register 9.11.2.13 PCI Bus Internal Memory-Mapped Registers Base Address Register (PIMMRBAR) 9.11.2.14 General Purpose Local Access Base Address Registers (GPLABAR ) Figure 9-46. General Purpose Local Access Base Address Reg isters (GPLABAR Table9-33 describes GPLABARx fields. Table9-33. GPLABAR 9.11.2.15 Subsystem Vendor ID Register Figure 9-47 and Table9-34 describe the subsystem vendor ID register. 9.11.2.16 Subsystem Device ID Register Figure 9-48 and Table9-35 describe the subsystem ID register. Figure 9-50 and Table9-37 describes the PCI bus interrupt line register. Figure 9-48. Subsystem Device ID Register 9.11.2.17 PCI Bus Capabilities Pointer Register 9.11.2.19 PCI Bus Interrupt Pin Register Figure9-52. PCI Bus MIN GNT Figure 9-51 and Table9-38 describe the PCI bus interrupt pin register. Figure 9-51. PCI Bus Interrupt Pin Register 9.11.2.20 PCI Bus MIN GNT 9.11.2.21 PCI Bus MAX LAT Figure 9-53 and Table9-40 describe the PCI bus MAX LAT register. Table9-41. describes PCI bus function register fields. Figure 9-53. PCI Bus MAX LAT 9.11.2.22 PCI Bus Function Register 9.11.2.23 PCI Bus Arbiter Configuration Register Figure 9-55. PCI Bus Arbiter Configuration Register Table9-41. PCI Bu s Function Register Field Descriptions Table9-42. describes the PCI bus arbiter configuration register fields. 9.11.2.24 PCI Hot Swap Register Block Table9-43 describes the Hot Swap register block fields. Figure 9-56. Hot Swap Register Block Table9-42. P CI Bus Arbiter Configuration Register Field Description 9.11.2.25 PCI Hot Swap Control Status Register Figure 9-57 and Table9-44 describe the Hot Swap control status register. Figure 9-57. Hot Swap Control Status Register Table9-43. Hot Swap Register Block Field Descriptions Table9-44. Hot Swap Control Status Register Field Descriptions 9.11.2.26 PCI Configuration Register Access from the Core Example: configuration sequence, 2-byte data write to register at address offset 0x1A for PCI bus. Page 9.11.2.28 Initializing the PCI Configuration Registers 9.12 Message Unit (I2O) 9.12.1 Messag e Registers 9.12.1.1 Inbound Message Registers (IMR ) 9.12.1.2 Outbound Message Registers (OMR ) 9.12.2 Door Bell Registers 9.12.2.1 Outbound Doorbell Register (ODR) Figure 9-62. Outbound Doorbel l Register (ODR) 9.12.2.2 Inbound Doorbell Register (IDR) Figure 9-63. Inbound Doorbell Regist er (IDR) Table9-48. ODR Field Descriptions 9.12.3 I2O Unit Figure 9-64. I2O Message Queue 9.12.3.1 PCI Configuration Identification 9.12.3.2 Inbound FIFOs Page Page Figure 9-67. Inbound Post_FIFO Head Pointer Register (IPHPR) Figure 9-68. Inbound Post_FIFO Tail Pointer Register (IPTPR) Table9-52. IPHPR F ield Descriptions 9.12.3.3 Outbound FIFOs Page Page Figure 9-72. Outbound Post_FIFO Tail Pointer Register (OPTPR) 9.12.3.4 I2O Registers Figure 9-73. Inbound FIFO Queue Port Regist er (IFQPR) Table9-57. OPTPR Field Descriptions Page Figure 9-75. Outbound Message Interrupt Status Register (OMISR) Table9-60 describes OMISR fields. Table9-60. OMISR Field Descriptions Figure 9-76. Outbound Message Interrupt Mask Register (OMIMR) Table9-61 describes OMIMR f ields. Table9-61. O MIMR Field Descriptions Figure 9-77. Inbound Message Interrupt Status Register (IMIS R) Table9-62 describes IMISR fields. Table9- 62. IMISR Field Descriptions Figure 9-78. Inbound Message Interrupt Mask Register (I MIMR) Table9-63 describes IMIMR fields. Table9-63. IMIMR Field Descriptions Figure 9-79. Messaging Unit Control Register (MUCR) Table9-64 describes MUCR fields. Table9-64. MUCR Field Descriptions Table9-63. IMIMR Field Descriptions (continued) Figure 9-80. Queue Base Address Register (QBAR) Table9-65 describes QB AR fields. Table9-65. Q BAR Field Descriptions Table9-64. MUCR Field Descriptions 9.13 DMA Controller 9.13.1 DMA Operat ion 9.13.1.1 DMA Direct Mode 9.13.1.2 DMA Chaining Mode 9.13.1.3 DMA Coherency 9.13.1.4 Halt and Error Conditions 9.13.1.5 DMA Transfer Types 9.13.1.6 DMA Registers Table 9-66 . DM AMR Field Descriptions Channels. 9.13.1.6.2 DMA Status Register [03] (DMASR Table 9-66 . DM AMR Table9-67 describes DMASRx fields. Figure 9-83. DMA Status Register [03] (DMASR Field Descriptions (continued) 9.13.1.6.3 DMA Current Descriptor Address Register [03] (DMACDAR Table9-67. DMASR Table9-68 describes DMACDARx fields. Figure 9-84. DMA Current Descriptor Address Register [03] (DMACDAR Field Descriptions Page Page 9.13.1.6.7 DMA Next Descriptor Address Register [03] (DMANDAR Table9-71. DMABCR Table9-72. DMANDAR Table9-72 describes DMANDARx fields. Figure 9-88. DMA Next Descriptor Address Register [03] (DMANDAR 9.13.2 DMA Segment Descriptors Figure 9-89. DMA Chain of Segment Descriptors 9.13.2.1 Descriptor in Big Endian Mode 9.13.2.2 Descriptor in Little Endian Mode 9.14 Error Handling 9.14.1 Interrupt and Error Signals 9.14.1.1 PCI Bus Error Signals 9.14.1.2 Illegal Register Access Error 9.14.1.3 PCI Interface Page 9.14.1.4 Embedded Utilities Chapter 10 Clocks and Power Control 10.1 Clock Unit 10.2 Clock Configuration 10.3 External Clock Inputs 10.4 Main PLL 10.4.1 PLL Block Diagra m 10.4.2 Skew Elimination 10.4.3 PCI Bridge Clocking 10.4.3.1 PCI Bridge as an Agent Operating from the PCI System Clock Figure 10-2. PCI Bridge as an Agent, Operating from the PCI System Clock 10.4.3.2 PCI Bridge as a Host and Generating the PCI System Clock Figure 10-3. PCI Bridge as a Host, Generating the PCI S ystem Clock 10.5 Clock Dividers 10.6 PowerQUICC II Internal Clock Signals 10.6.1 General System Clocks 10.7 PLL Pins Table10-1 shows dedicated PLL pins . Table10-1. Dedicated PLL Pins Figure 10-4 shows the filtering circuit for VCCSYN and VCCSYN1, described in Table10- 1. Figure 10-4. PLL Filtering Circuit Table10 -1. Dedicated PLL Pins (continued) .29m (HiP3) Silicon: Rev. A.1 and B.x .29m (HiP3) Silicon: Rev. C.2 and Future Revisions 10.8 System Clock Control Register (SCCR) Table10-2 describes SCCR fields. Figure 10-5. System Clock Control Register (SCCR) Table10-2. SCCR Field Descriptions 10.9 System Clock Mode Register (SCMR) Figure 10-6. System Clock Mode Register (SCMR) Table10-2. SCCR Field D escriptions (continued) The relationships among these parameters are described in the formulas in Figure10-7. Figure 10-7. Relationships of SCMR Paramet ers SCMR[CORECNF] bit values are shown in Table10-4. Table10-3. SCMR Field Descriptions 10.10 Basic Power Structure Table10-4. 60x Bus-to-Core Frequency Page Chapter 11 Memory Controller Figure 11-1. Dual-Bus Architecture 11.1 Features 11.2 Basic Architecture Page Page 11.2.1 Address and Address Space Checking 11.2.2 Page Hit Checking 11.2.3 Error Checking and Correction (ECC ) 11.2.4 Parity Generation and Checking 11.2.5 Transfer Error Acknowledge (TEA) Generation 11.2.6 Machine Check Interrupt (MCP) Generati on 11.2.7 Data Buffer Controls (BCTL and LWR) 11.2.8 Atomic Bus Operation 11.2.9 Data Pipelining 11.2.10 E xternal Memory Controller Support 11.2.11 E xternal Address Latch Enable Signal (ALE) 11.2.12 E CC/Parity Byte Select (PBSE) 11.2.13 Partial Data Valid Indication (PSDVAL) 11.2.14 BADDR[27:31] Signal Connections Table11-3 lists registers used to control the 60x bus memory controller. 11.3 Register Descriptions Table11-2. BADDR Connections Table11-3. 60x B us Memory Controller Registers 11.3.1 Base Registers (BR Figure 11-6. Base Registers (BR Table11-4 describes BRx fields. Table11-4. BR 11.3.2 Option Registers (OR Table11-5. OR Field Descriptions (SDRAM Mode) Figure 11-8 shows ORx as it is formatted for GPCM mode. Table11-5. OR Figure 11-8. OR Table11-6 describes ORx fields in GPCM mode. GPCM Mode Table11-6. OR Table11-6. OR GPCM Mode Field Descriptions (continued) Figure 11-9. OR Table11-7 describes the ORx fields in UPM mode. UPM Mode Table11-7. Option Reg ister (OR )UPM Mode 11.3.3 60x SDRAM Mode Register (PSDMR) Figure 11-10. 60x/Local SDRAM Mode Register (PSDMR/LSDMR) Table11-8 describes PSDMR fields. LSMDR fields a re described in Table 11-9.. Table11-7. Option Reg ister (OR )UPM Mode Table11-8. PSDMR Field Descriptions Table11-8. PSDMR Field Descriptions (continued) 11.3.4 Local Bus SDRAM Mode Register (LSDMR) Table11-9. LSDMR Field Descriptions Table11-8. PSDMR Field Descriptions (continued) Page Page 11.3.5 Machine A/B/C Mode Registers (M MR) Mode Registers (M Figure 11-11. Machine Table11-10 describes MxMR bits. Table11-10. Machine x Mode Registers (M 11.3.6 Memory Data Register (MDR) Table11-10. Machine x Mode Registers (M MR) (continued) Table11-11 describes MDR fields. 11.3.7 Memory Address Register (MAR) Figure 11-13. Memory Address Register (MAR) Table11-12 describes MAR fields. The memory address register (MAR) is shown in Figure 11-13. Figure 11-12. Memory Data Register (MDR) Table11-11. MDR Field Descriptions 11.3.8 60x Bus-Assigned UPM Refres h Timer (PURT) The 60x bus assigned UPM refresh timer register (PURT) is shown in Figure11-14. Table11-14 describes LURT fields. Table11-13 describes PURT fields. 11.3.9 Local Bus-Assigned UPM Re fresh Timer (LURT) 11.3.10 60x Bus-Assigned SDRAM Refresh Timer (PSRT) The 60x bus assigned SDRAM refresh timer register (PSRT) is shown in Figure 11-16. The local bus-assigned SDRAM refresh timer register (LSRT) is shown in Figure11-17. Table11-15 describes PSRT fields. 11.3.11 Local Bus-Assigned SDRAM Refresh Timer (LSRT) 11.3.12 Memory Refresh Timer Pres caler Register (MPTPR) bus Table11-17 describes MPTPR fields. Figure 11-18 shows the memory refresh timer prescaler register (MPTPR). Figure 11-17. Local Bus-Assigned SDRAM Refresh Timer (LSRT) Table11-16. LSRT Field Descr iptions 11.4 SDRAM Machine Figure 11-19. 128-Mbyte SDRAM (Eight-Bank Configuration, Banks 1 and 8 Shown) 11.4.1 Supported SDRAM Configurations 11.4.2 SDRAM Power-On Initialization 11.4.3 JEDEC-Standard SDRAM Interface Commands 11.4.4 Page-Mode Support and Pipeline Accesses Table11-19. SDRAM Interface Commands 11.4.5 Bank Interleaving 11.4.5.1 Using BNKSEL Signals in Single-PowerQUICCII Bus Mode 11.4.5.2 SDRAM Address Multiplexing (SDAM and BSMA) 11.4.6 SDRAM Device-Specific Parameters 11.4.6.1 Precharge-to-Activate Interval 11.4.6.2 Activate to Read/Write Interval 11-40 Freescale Semiconductor Figure 11-21. ACTTORW = 2 (2 Clock Cycles) 11.4.6.3 Column Address to First Data OutCAS Latency Figure 11-22. CL = 2 (2 Clock Cycles) Freescale Semiconductor 11-41 11.4.6.4 Last Data Out to Precharge Figure 11-24. WRC = 2 (2 Clock Cycles) Figure 11-23. LDOTOPRE = 2 (-2 Clock Cycles) 11.4.6.5 Last Data In to PrechargeWrite Recovery 11.4.6.6 Refresh Recovery Interval (RFRC) 11.4.6.7 External Address Multiplexing Signal 11.4.6.8 External Address and Command Buffers (BUFCMD) Freescale Semiconductor 11-43 Figure11-27. BUFCMD = 1 11.4.7 SDRAM Interface Timing Figure 11-28 through Figure11-36 show SDRAM timing for various types of acce sses. 11-44 Freescale Semiconductor Figure 11-29. SDRAM Single-Beat Read, Page Hit, CL = 3 Figure 11-30. SDRAM Two-Beat Burst Read, Page Closed, CL = 3 Figure 11-31. SDRAM Four-Beat Burst Read, Page Miss, CL = 3 Freescale Semiconductor 11-45 Figure 11-32. SDRAM Single-Beat Write, Page Hit Figure 11-33. SDRAM Three-Beat Burst Write, Page Closed Figure 11-34. SDRAM Read-after-Read Pipeline, Page Hit, CL = 3 11.4.8 SDRAM Read/Write Transactions 11.4.9 SDRAM MODE-SET Command Timing 11.4.10 SDRAM Refresh 11.4.11 SDRAM Refresh Timing 11.4.12 SDRAM Configuration Examples 11.4.12.1 SDRAM Configuration Example (Page-Based Interleaving) 11.4.13 SDRAM Configuration Example (Bank-Based Interleaving) 11.5 General-Purpose Chip-Select Machine (GPCM) Table11-27. SDRAM Device Address Port during ACTIVATE Command Table11-28. SDRAM Device Address Port during READ/WRITE Command Table11-29. Register Settings (Bank-Based Interleaving) Page 11.5.1 Timing Configuration 11.5.1.1 Chip-Select Assertion Timing 11.5.1.2 Chip-Select and Write Enable Deassertion Timing Page Figure 11-45. GPCM Memory Device Basic Timing (ACS 00, CSNT = 1, TRLX = 0) 11.5.1.3 Relaxed Timing Figure 11-46. GPCM Relaxed Timing Read (ACS = 1x, SCY = 1, CSNT = 0, TRLX= 1) Figure 11-47. GPCM Relaxed-Timing Write (ACS = 1x, SCY = 0, CSNT = 0,TRLX = 1) Figure 11-48. GPCM Relaxed-Timing Write (ACS = 10, SCY = 0, CSNT = 1, TRLX = 1) 11.5.1.4 Output Enable (OE) Timing 11.5.1.5 Programmable Wait State Configuration 11.5.1.6 Extended Hold Time on Read Accesses [2930] = 00, Fastest Timing) Figure 11-50. GPCM Read Followed by Read (OR See Figure 11-50 through Figure 11-53 for timing examples. Table11-32. TRLX and EHTR Combinations Figure 11-51. GPCM Read Followed by Read (OR [2930] = 01) Figure 11-52. GPCM Read Followed by Write (OR 11.5.2 External Access Termination 11.5.3 Boot Chip-Select Operation 11.5.4 Differences between MPC8xxs GPCM and MPC82xxs GPCM 11.6 User-Programmable Machines (UPMs) 11.6.1 Requests Page 11.6.1.1 Memory Access Requests 11.6.1.2 UPM Refresh Timer Requests 11.6.1.3 Software RequestsRUN Command 11.6.1.4 Exception Requests 11.6.2 Programming the UPMs 11.6.3 Clock Timing Page 11.6.4 The RAM Array Figure 11-61. RAM Array and Signal Generation 11.6.4.1 RAM Words Figure 11-62. The RAM Word Table11-36 describes RAM word fields. Table11-36. RAM Word Bit Settings Page Page T Page Page 11.6.4.2 Address Multiplexing 11.6.4.3 Data Valid and Data Sample Control 11.6.4.4 Signals Negation 11.6.4.5 The Wait Mechanism 11.6.4.6 Extended Hold Time on Read Accesses 11.6.5 UPM DRAM Configuration Example 11.6.6 Differences between MPC8xx U PM and MPC82xx UPM 11.7 Memory System Interface Example Using UPM Table11-42. UPMs Attributes Example Figure 11-68. Single-Beat Read Access to FPM DRAM Figure 11-69. Single-Beat Write Access to FPM DRAM Figure 11-70. Burst Read Access to FPM DRAM (No LOOP) Figure 11-71. Burst Read Access to FPM DRAM (LOOP) Figure 11-72. Burst Write Access to FPM DRAM (No LOOP) Figure 11-73. Refresh Cycle (CBR) to FPM DRAM Figure 11-74. Exception Cycle Table11-43. UPMs Attributes Example Page Figure 11-75. FPM DRAM Burst Read Access (Data Sampling on Falling Edg e of CLKIN) 11.7.0.1 EDO Interface Example Figure 11-76. PowerQUICC II/EDO Interface Connection to the 60x Bus Table11-44. EDO Connection Field Value Example Table11-44. EDO C onnection Field Value Example (continued) Figure 11-77. Single-Beat Read Access to EDO DRAM Figure 11-78. Single-Beat Write Access to EDO DRAM Figure 11-79. Single-Beat Write Access to EDO DRAM Using REDO to Insert Three Wait States Figure 11-80. Burst Read Access to EDO DRAM Figure 11-81. Burst Write Access to EDO DRAM Figure 11-82. Refresh Cycle (CBR) to EDO DRAM Figure 11-83. Exception Cycle For EDO DRAM 11.8 Handling Devices with Slow or Variable Access Times 11.8.1 Hierarchica l Bus Interface Example 11.8.2 Slow Devices Example 11.9 External Master Support (60x-Compatible Mode) 11.9.1 60x-Compatible External Mast ers (non-PowerQUICC II) 11.9.2 PowerQUICC II External Masters 11.9.3 Extended Controls in 60x-Compatible Mode 11.9.4 Address Incrementing for Exter nal Bursting Masters 11.9.5 External Masters Timing Figure 11-84. Pipelined Bus Operation and Memory Access in 60x-Compatible Mode Figure 11-85. External Master Access (GPCM) 11.9.5.1 Example of External Master Using the SDRAM Machine Figure 11-86. External Master Configuration with SDRAM Device Chapter 12 Secondary (L2) Cache Support 12.1 L2 Cache Configurations 12.1.1 Copy-Back Mo de Figure 12-1. L2 Cache in Copy-Back Mode 12.1.2 Write-Through Mode Page Figure 12-2. External L2 Cache in Write-Through Mode 12.1.3 ECC/Parity Mode Page Figure 12-3. External L2 Cache in ECC/Parity Mode 12.2 L2 Cache Interface Parameters 12.3 System Requirements When Using the L2 Cache Interface 12.4 L2 Cache Operation 12.5 Timing Example Figure 12-4. Read Access with L2 Cache Chapter 13 IEEE 1149.1 Test Access Port 13.1 Overview Figure 13-1. Test Logic Block Diagram The TAP consists of the signals in Table 13-1. 13.2 TAP Controller Table13-1. TAP Signals Figure 13-2. TAP Controller State Machine 13.3 Boundary Scan Register Figure 13-3. Output Pin Cell (O.Pin) Figure 13-4. Observe-Only Input Pin Cell (I.Obs) Figure13-5. Output Control Cell (IO.CTL) Figure 13-6. General Arrangement of Bidi rectional Pin Cells 13.4 Instruction Register Table13-2. Instruction Decoding 13.5 PowerQUICC II Restrictions 13.6 Nonscan Chain Operation Page Part IV Communications Processor Module Page Architecture Documentation Page TableIV-1. Acronyms and Abbreviated Terms Page TableIV-1. Acronyms and Abbreviated Terms (continued) Page Chapter 14 Communications Processor Module Overview 14.1 Features Page Figure 14-1 shows the PowerQUICC I I s CPM block diagram. Figure 14-1. PowerQUICCII CPM Block Diagram 14.2 PowerQUICC II Serial Configurations 14.3 Communications Processor (CP) 14.3.1 CPM Performance Evaluation 14.3.2 Features 14.3.3 CP Block Diagram Figure 14-2. Communications Processor (CP) Block Diagram 14.3.4 G2 Core Interface The CP communicates with the G2 core in several ways: 14.3.5 Peripheral Interface 14.3.6 Execution from RAM 14.3.7 RISC Controller Configuration Register (RCCR) Table14 -2. Peripheral Prioritization (continue d) RCCR bit fields are described in Table14-3. Table14-3. RISC Co ntroller Configuration Register Field Descriptions (continued) 14.3.8 RISC Time-Stamp Control Register (RTSCR) The RISC time-stamp register (RTSR), shown in Figure14-5, contains the time stamp. Table14-4 describes RTSCR fields. 14.3.9 RISC Time-Stamp Register (RTSR) Figure 14-4. RISC Time-Stamp Control Register (RTSCR) Table14-4. RTSCR Field Descriptions 14.4 Command Set 14.4.1 CP Command Register (CPCR) Table14-6 describes CPC R fields. Figure 14-6. CP Command Register (CPCR) Table14-6. CP Command Register Field Descript ions 14.4.1.1 CP Commands The CP command opcodes are shown in Table14-7. Table14-6. CP Command Register Field Descriptions (continued) Table14 -7. CP Command Opcodes Table14-8. Command Descriptions 14.4.2 Command Register Example 14.4.3 Command Execution Latency 14.5 Dual-Port RAM Table14-8. Command Descriptions (continued) Page Figure 14-8. Dual-Port RAM Memory Map 14.5.1 Buffer Descriptors (BDs) 14.5.2 Parameter RAM Table14-10. Parameter RAM 14.6 RISC Timer Tables 14.6.1 RISC Timer Table Parameter RAM Figure 14-9. RISC Timer Table RAM Usage Table14-11. RISC T imer Table Parameter RAM 14.6.2 RISC Timer Command Register (TM_CMD) 14.6.3 RISC Timer Table Entries 14.6.4 RISC Timer Event Registe r (RTER)/Mask Register (RTMR) 14.6.5 SET TIMER Command 14.6.6 RISC Timer Initialization Sequence 14.6.7 RISC Timer Initialization Example 14.6.8 RISC Timer Interrupt Handling 14.6.9 RISC Timer Table Scan Algorithm 14.6.10 Using the RISC Timers to Track CP Loading Page Page Figure15-1. SI Block Diagram 15.1 Features 15.2 Overview Figure15-2. Various Configurations of a Single TDM Channel Page 15.3 Enabling Connections to TSA Figure 15-4. Enabling Connections to the TS A 15.4 Serial Interface RAM 15.4.1 One Multiplexed Channel with Static Frames 15.4.2 One Multiplexed Channel with Dynamic Frames Figure 15-6. One TDM Channel with Shadow RAM for Dynamic Route Change 15.4.3 Programming SI RAM Entry Fields Figure 15-7. SI When MCC = 0, the SIx RAM entry fields function as described in Table15-1. RAM Entries Table15-1. SI RAM Entry (MCC = 0) Page Table15-2. SI RAM Entry (MCC = 1) 15.4.4 SI RAM Programming Example 15.4.5 Static and Dynamic Routing Page Figure 15-9. Example: SI RAM Size RAM Dynamic Changes, TDMa and b, Same SI 15.5 Serial Interface Registers 15.5.1 SI Global Mode Registers (SI 15.5.2 SI Mode Regist ers (SI GMR) MR) Table15-5 describes SIxMR fields. Figure 15-11. SI Mode Registers (SI MR Field Descriptions MR Field Descriptions (continued) Figure 15-12 shows the one-clock delay from sync to data when xFSD = 01. Figure 15-12. One-Clock Delay from Sync to Data ( Figure 15-14 shows the effects of changing FE when CE = 1 with a 1-bit frame sync delay. Figure 15-13. No Delay from Sync to Data ( FSD = 01) Figure 15-15 shows the effects of changing FE when CE = 0 with a 1-bit frame sync delay. FSD = 01 Figure 15-16 shows the effects of changing FE when CE = 1 with no frame sync delay. Figure 15-16. Falling Edge (FE) Effect When CE = 1 and Figure 15-17 shows the effects of changing FE when CE = 0 with no frame sync delay. FSD = 00 Figure 15-17. Falling Edge (FE) Effect When CE = 0 and 15.5.3 SI FSD = 00 RAM Shadow Address Registe rs (SI RSR) Table15-6. describes SIxRSR fields. 15.5.4 SI Command Register (SI Table15-7 describes SIxCMDR fields. CMDR) RSR) Table15-6. SI RSR Field Descriptions 15.6 Serial Interface IDL Interface Support CMDR Field Description STR) Table15-8. SI STR Field Descriptions 15.6.1 IDL Interface Example Figure 15-22. IDL Terminal Adaptor Table15-9. IDL Signal Descriptions Page 15.6.2 IDL Interface Programming 15.7 Serial Interface GCI Support Page 15.7.1 SI GCI Activation/Deactivation Procedure 15.7.2 Serial Interface GCI Programming 15.7.2.1 Normal Mode GCI Programming 15.7.2.2 SCIT Programming Page Chapter 16 CPM Multiplexing Figure 16-1. CPM Multiplexing Logic (CMX) Block Diagram 16.1 Features 16.2 Enabling Connections to TSA or NMSI Figure 16-2. Enabling Connections to the TS A 16.3 NMSI Configuration Figure 16-3. Bank of Clocks Table16-1. Clock Source Options 16.4 CMX Registers 16.4.1 CMX UTOPIA Address Register (CMXUAR) Page Figure 16-5. Connection of the Master Address Figure 16-6. Connection of the Slave Address Page Figure 16-7. Multi-PHY Receive Address Multiplexing 16.4.2 CMX SI1 Clock Route Register (CMXSI1CR) Table16-3 describes CMXSI1CR fields. 16.4.3 CMX SI2 Clock Route Register (CMXSI2CR) Figure 16-8. CMX SI1 Clock Route Register (CMXSI1CR) Table16-3. CMXS I1CR Field Descriptions Table16-4 describes CMXSI2CR fields. 16.4.4 CMX FCC Clock Route Register (CMXFCR) Figure 16-9. CMX SI2 Clock Route Register (CMXSI2CR) Table16-4. CMXS I2CR Field Descriptions Table16-5 describes CMXFCR fields. Figure 16-10. CMX FCC Clock Route Register (CMXFCR) Table16-5. CMXFCR Field Descriptions Table16-5. CMXFCR Field Descriptions (continued) 16.4.5 CMX SCC Clock Route Register (CMXSCR) Table16-6 describes CMXSCR fields. Figure 16-11. CMX SCC Clock Route Register (CMXSCR) Table16-6. CMXSCR Field Descriptions Table16-5. CMXFCR Field Descriptions (continued) Page Page 16.4.6 CMX SMC Clock Route Register (CMXSMR) Table16-7 describes CMXSMR fields. Figure 16-12. CMX SMC Clock Route Register (CMXSMR) Table16-7. CMXSMR Field Descriptions Table16-7. CMXSMR Field Descriptions Chapter 17 Baud-Rate Generators (BRGs) 17.1 BRG Configuration Registers 18 (BRGC Table17-2 shows the possible external clock sources for the BRGs. Table17-1. BRGC Field Descriptions 17.2 Autobaud Operation on a UART 17.3 UART Baud Rate Examples Page Chapter 18 Timers Figure18-1. Timer Block Diagram Pin assignments for TINx, TGATEx, and TOUTx are described in Section40.5, Ports Tables. 18.1 Features 18.2 General-Purpose Timer Units 18.2.1 Cascaded Mode 18.2.2 Timer Global Configuration Registers (TGCR1 and TGCR2) Table18-1 describes TGCR1 fields. The TGCR2 register is shown in Figure18-4. Figure 18-3. Timer Global Configuration Register 1 (TGCR1) Table18-1. TGCR1 Field Descriptions Table18-2 describes TGCR2 fields. 18.2.3 Timer Mode Registers (TMR1 TMR4) Figure 18-4. Timer Global Configuration Register 2 (TGCR2) Table18-2. TGCR2 Field Descriptions Table18-3 describes TMR1TMR 4 register fields. 18.2.4 Timer Reference Registers (TR R1TRR4) Figure 18-5. Timer Mode Registers (TMR1TMR4) Table18-3. TMR1TM R4 Field Descriptions 18.2.5 Timer Capture Registers (TCR1 TCR4) 18.2.6 Timer Counters (TCN1TCN4) 18.2.7 Timer Event Registers (TER1 TER4) Page Chapter 19 SDMA Channels and IDMA Emulation 19.1 SDMA Bus Arbitration and Bus Transfers 19.2 SDMA Registers 19.2.1 SDMA Status Register (SDSR) 19.2.2 SDMA Mask Register (SDMR) 19.2.3 SDMA Transfer Error Address Registers (PDTEA and LDTEA) 19.2.4 SDMA Transfer Error MSNUM Registers (PDTEM and LDTEM) 19.3 IDMA Emulation 19.4 IDMA Features 19.5 IDMA Transfers 19.5.1 Memory-to-Memory Transfers Page 19.5.1.1 External Request Mode 19.5.1.2 Normal Mode 19.5.1.3 Working with a PCI Bus 19.5.2 Memory to/from Peripheral Transfers 19.5.2.1 Dual-Address Transfers 19.5.2.2 Single Address (Fly-By) Transfers 19.5.3 Controlling 60x Bus Bandwidth 19.5.4 PCI Burst Length and Latency Control 19.6 IDMA Priorities 19.7 IDMA Interface Signals and DACK 19.7.1 DREQ 19.7.1.1 Level-Sensitive Mode 19.7.1.2 Edge-Sensitive Mode 19.7.2 DONE 19.8 IDMA Operation 19.8.1 Auto Buffer and Buffer Chaining 19.8.2 IDMA Parameter RAM Table19-4. IDMA Parameter RAM 19.8.2.1 DMA Channel Mode (DCM) Table19-4. IDMA Figure19-9. DCM Parameters Table19-5 describes DC M bits. Parameter RAM (continued) Table19-5. DCM Field Descriptions 19.8.2.2 Data Transfer Types as Programmed in DCM Table19-6 summarizes the types of data transfers according to the DCM programming. Table19-6. IDMA Channel Data Transfer Operation Table19-5. DCM Field Descriptions (continued) 19.8.2.3 Programming DTS and STS Table19-7. Valid Memory-to-Memory STS/DTS Values Table19-6. IDMA Channel Data Transfer Operation (continued) Table19-8 describes valid STS/DTS values for memory/peripheral operations. 19.8.3 IDMA Performance Table19-8. Valid STS/DTS Values for Peripherals Table19-7. Valid Memory-to-Memory STS/DTS Values 19.8.4 IDMA Event Register (IDSR) and Mask Register (IDMR) 19.8.5 IDMA BDs Table19-10 describes IDMA BD fields. Figure 19-11. IDMA BD Structure Table19-10. IDMA BD F ield Descriptions Table19-10. IDMA BD F ield Descriptions (continued) 19.9 IDMA Commands 19.9.1 START_IDMA Command 19.9.2 STOP_IDMA Command 19.10 IDMA Bus Exceptions 19.10.1 Externally Recognizing IDMA Operand Transfers 19.11 Programming the Parallel I/O Registers PPARD, PDIRD, PODRD, and PSORD control port D in the same way. 19.12 IDMA Programming Examples 19.12.1 Peripher al-to-Memory Mode (60x Bus to Local Bus)IDMA2 Table19-15. Example: Peripheral-to-Memory ModeIDM A2 (continued) 19.12.2 Memory-to-Peripheral Fly-By ModeIDMA3 Table19-16. Exa mple: Memory-to-Peripheral Fly-By Mode (on 60x)IDMA3 19.12.3 Memory-to-Memory (PCI Bus to 60x Bus)IDMA1 Table19-17. Progra mming Example: Memory-to-Memory (PCI-to-60x)IDMA1 (continued) Chapter 20 Serial Communications Controllers (SCCs) 20.1 Features 20.1.1 The General SCC Mode Registers (GSMR1GSMR4) Table20-1 describes GSMR_H f ields. Figure 20-2. GSMR_HGeneral SCC Mode Register (High Order) Table20-1. GSMR_H Field Description s Table20-1. GSMR_H Field Descriptions (continued) Figure 20-3 shows GSMR_L. Table20-2 describes GSMR_L fields. Figure 20-3. GSMR_LGeneral SCC Mode Register (Low O rder) Table20-2. GSMR _L Field Descriptions Table20-1. GSMR_H Field Descriptions (continued) Page Page Page 20.1.2 Protocol-Specific Mode Register (PSMR) 20.1.3 Data Synchronization Register (DSR) 20.1.4 Transmit-on-Demand Register (TODR) 20.2 SCC Buffer Descriptors (BDs) Page Page 20.3 SCC Parameter RAM 20.3.1 SCC Base Addresses Table20 -4. SCC Parameter RAM Map for All Protocols (continued) 20.3.2 Function Code Registe rs (RFCR and TFCR) /TFCR Table20-6 describes RFCRx/TFCRx fields. Table20-5. Parameter RAMSCC Base Addresses Figure 20-8. Function Code Registers (RFCR and TFCR) Table20-6. RFCR 20.3.3 Handling SCC Interrupts 20.3.4 Initializing the SCCs 11.Set GSMR_L[ENT] and GSM R_L[ENR]. 20.3.5 Controlling SCC Timing with RTS, CTS, and CD 20.3.5.1 Synchronous Protocols Figure 20-9. Output Delay from RTS Asserted for Synchronous Protocols Figure 20-10. Output Delay from CTS Asserted for Synchronous Protocols Figure 20-11. CTS Lost in Synchronous Protocols 20.3.5.2 Asynchronous Protocols 20.3.6 Digital Phase-Locked Loop (DPLL) Operation Figure 20-13. DPLL Receiver Block Diagram Page 20.3.6.1 Encoding Data with a DPLL 20.3.7 Reconfiguring the SCCs 20.3.8 Saving Power Page Chapter 21 SCC UART Mode 21.1 Features 21.2 Normal Asynchronous Mode 21.3 Synchronous Mode 21.4 SCC UART Parameter RAM Table21-1. UART-Specific SCC Parameter RAM Memory Map 21.5 Data-Handling Methods: Character- or Message-Based 21.6 Error and Status Reporting 21.7 SCC UART Commands The transmit commands in Table21-2 are issued to the CP command register (CPCR). Receive commands are described in Table 21-3. 21.8 Multidrop Systems and Address Recognition Table21-2. Transmit Commands 21.9 Receiving Control Characters Table21-4 describes the data structure used in control character recognition. Figure 21-3. Control Character Table Table21-4. Control Character Table, RCCM, and RCCR Descriptions 21.10 Hunt Mode (Receiver) 21.11 Inserting Control Characters into the Transmit Data Stream 21.12 Sending a Break (Transmitter) 21.13 Sending a Preamble (Transmitter) 21.14 Fractional Stop Bits (Transmitter) 21.15 Handling Errors in the SCC UART Controller Reception errors are described in Table21-8. Table21-6. DSR Fields Descriptions Table21-7. Transmission Errors 21.16 UART Mode Register (PSMR) Table21 -8. Reception Errors Table21-9 describes PSMR UART fields. 21.17 SCC UART Receive Buffer Descriptor (RxBD) Table21-9. PSMR UART Field Descriptions (continued) Page Figure 21-7. SCC UART Receiving using RxBDs Figure 21-8 shows the SCC UART RxBD. Table21-10 describes RxBD s tatus and control fields. Section 20.2, SCC Buffer Descriptors (BDs), describes the data length and buffer pointer fields. 21.18 SCC UART Transmit Buffer Descriptor (TxBD) Table21-11 describes TxBD status and control fields. Table21-10. SCC UART RxBD Status and Control Field Descriptions (continued) 21.19 SCC UART Event Register (SCCE) and Mask Register (SCCM) Table21-11. SCC UART TxBD Status and Control Field Descriptions (continued) Figure 21-10. SCC UART Interrupt Event Example Figure 21-11. SCC UART Event Register (SCCE) and Mask Register (SCCM) Table21-12 describes SCCE fields for UART mode. 21.20 SCC UART Status Register (SCCS) The SCC UART status register (SCCS), shown in Figure21-12, monitors the real-time status of RXD. Figure 21-12. SCC Status Register for UART Mode (SCCS) Table21-13 describes UART SCCS fields. Table21-12. SCCE/SCCM Field Descriptions for UART Mode 21.21 SCC UART Programming Example 21.22 S-Records Loader Application Page Chapter 22 SCC HDLC Mode 22.1 SCC HDLC Features 22.2 SCC HDLC Channel Frame Transmission 22.3 SCC HDLC Channel Frame Reception 22.4 SCC HDLC Parameter RAM Figure 22-2 shows 16- and 8-bit address recognition. Figure 22-2. HDLC Address Recognition 22.5 Programming the SCC in HDLC Mode Table22-1. HDLC-Specific SCC Parameter RAM Memory Map (continued) 22.6 SCC HDLC Commands Receive commands are described in Table 22-3. 22.7 Handling Errors in the SCC HDLC Controller Table22-2. Transmit Commands Table22-3. Recei ve Commands Reception errors are described in Table22-5. Table22-4. Transmit Errors Table22-5. Receive E rrors 10 0 22.8 HDLC Mode Register (PSMR) Table22-6 describes PSMR HDLC fields. Figure 22-3. HDLC Mode Register (PSMR) Table22-6. PSMR HDLC F ield Descriptions 22.9 SCC HDLC Receive Buffer Descriptor (RxBD) The CP uses the RxBD, shown in Figure22-4, to report on data received for each buffer. Table22-7 describes HDLC RxBD status and control fields. Table22-6. PSMR H DLC Field Descriptions (continued) Table22-7. SCC HDLC RxBD Status and Control Field Descriptions (continued) Figure 22-5. SCC HDLC Receiving Using RxBDs 22.10 SCC HDLC Transmit Buffer Descriptor (TxBD) The CP uses the TxBD, shown in Figure22-6, to confirm transmissions and indicate error conditions. Table22-8 describes HDLC TxBD status and control fields. 22.11 HDLC Event Register (SCCE)/HDLC Mask Register (SCCM) Figure 22-8 shows interrupts that can be generated using the HDLC protocol. Figure 22-8. SCC HDLC Interrupt Event Example Table22-9. SCCE/SCCM Field Des criptions (continued) 22.12 SCC HDLC Status Register (SCCS) 22.13 SCC HDLC Programming Examples 22.14 SCC HDLC Programming Example #1 Page 22.14.1 SCC HDLC Programming Example #2 22.15 HDLC Bus Mode with Collision Detection Page 22.15.1 HDLC Bus Features 22.15.2 Accessing the HDLC Bus 22.15.3 Increasing Performance Figure 22-13. Nonsymmetrical Tx Clock Duty Cycle for Increased Performance 22.15.4 Delayed RTS Mode Figure 22-14. HDLC Bus Transmission Line Configuration Figure 22-15. Delayed RTS Mode 22.15.5 Using the Time-Slot Assigner (TSA) Figure22-16. HDLC Bus TDM Transmission Line Configuration 22.15.6 HDLC Bus Protocol Programming 22.15.6.1 Programming GSMR and PSMR for the HDLC Bus Protocol 22.15.6.2 HDLC Bus Controller Programming Example Chapter 23 SCC BISYNC Mode 23.1 Features 23.2 SCC BISYNC Channel Frame Transmission 23.3 SCC BISYNC Channel Frame Reception 23.4 SCC BISYNC Parameter RAM 23.5 SCC BISYNC Commands Receive commands are described in Table 23-3. 23.6 SCC BISYNC Control Character Recognition Table23-2. Transmit Commands Table23-3. Recei ve Commands Page 23.7 BISYNC SYNC Register (BSYNC) Figure 23-3. BISYNC SYNC (BSYNC) Table23-5 describes BSYNC fields. Table23-4. Control Character Table and RCCM Field Descriptions 23.8 SCC BISYNC DLE Register (BDLE) 23.9 Sending and Receiving the Synchronization Sequence 23.10 Handling Errors in the SCC BISYNC Table23-9 describes receive errors. 23.11 BISYNC Mode Register (PSMR) Figure 23-5. Protocol-Specific Mode Regist er for BISYNC (PSMR) Table23-10 describes PSMR fields. Table23-8. Transmit Errors XXX Table23-10. PSMR Field Descriptions 23.12 SCC BISYNC Receive BD (RxBD) Table23-11. SCC BISYNC RxBD Status and Control Field Descriptions (continued) 23.13 SCC BISYNC Transmit BD (TxBD) Table23-12 describes SCC BISYNC TxBD status and control fields. 23.14 BISYNC Event Register (SCCE)/BISYNC Mask Register (SCCM) Table23-13 describes SCCE and SCCM fields. 23.15 SCC Status Registers (SCCS) Figure 23-9. SCC Status Registers (SCCS) Table23-14 describes SCCS fields. 23.16 Programming the SCC BISYNC Controller 23.17 SCC BISYNC Programming Example Page Page Chapter 24 SCC Transparent Mode 24.1 Features 24.2 SCC Transparent Channel Frame Transmission Process 24.3 SCC Transparent Channel Frame Reception Process 24.4 Achieving Synchronization in Transparent Mode 24.4.1 Synchronization in NMSI Mode 24.4.1.1 In-Line Synchronization Pattern 24.4.1.2 External Synchronization Signals Page 24.4.1.3 Transparent Mode without Explicit Synchronization 24.4.2 Synchronization and th e TSA 24.4.2.1 Inline Synchronization Pattern 24.4.2.2 Inherent Synchronization 24.4.3 End of Frame Dete ction 24.5 CRC Calculation in Transparent Mode 24.6 SCC Transparent Parame ter RAM 24.7 SCC Transparent Com mands Table24-4 describes receive commands. 24.8 Handling Errors in the Transparent Controller Table24-6 describes receive errors. Table24-4. Recei ve Commands Table24-5. Transmit Errors Table24-3. Transmit Commands (continued) 24.9 Transparent Mode and the PSMR 24.10 SCC Transparent Receive Buffer Descriptor (RxBD) Table24-7. SCC Transparent RxBD Status and Control Field Descriptions 24.11 SCC Transparent Transmit Buffer Descriptor (TxBD) 24.12 SCC Transparent Event Register (SCCE)/Mask Register (SCCM) 24.13 SCC Status Register in Transparent Mode (SCCS) Table24-10 describes SCCS fields. 24.14 SCC2 Transparent Programming Example Figure 24-5. SCC Status Register in Transparent Mode (SCCS) Table24-10. SCCS Field Descriptions Table24-9. SCCE/SCCM Field Des criptions (continued) Page Page Chapter 25 SCC Ethernet Mode 25.1 Ethernet on the PowerQUICC II 25.2 Features Page 25.3 Connecting the PowerQUICCII to Ethernet 25.4 SCC Ethernet Channel Frame Transmission 25.5 SCC Ethernet Channel Frame Reception 25.6 The Content-Addressable Memory (CAM) Interface 25.7 SCC Ethernet Parameter RAM Table25 -1. SCC Ethernet Parameter RAM Memory Map (con tinued) 25.8 Programming the Ethernet Controller 25.9 SCC Ethernet Commands Table25 -1. SCC Ethernet Parameter RAM Memory Map (con tinued) Table25-3 describes receive commands. Table25-2. Transmit Commands Table25-3. Recei ve Commands 25.10 SCC Ethernet Address Recognition Figure 25-4. Ethernet Address R ecognition Flowchart 25.11 Hash Table Algorithm 25.12 Interpacket Gap Time 25.13 Handling Collisions 25.14 Internal and External Loopback 25.15 Full-Duplex Ethernet Support 25.16 Handling Errors in the Ethernet Controller Table25-5 describes reception errors. 25.17 Ethernet Mode Register (PSMR) Figure 25-5. Ethernet Mode Register (PSMR ) Table25-6 describes PSMR fields. Table25 -5. Reception Errors Table25-4. Transmission Errors (continued) Table25-6. PSMR Field Descriptions 25.18 SCC Ethernet Receive BD The Ethernet controller uses the RxBD to report on the received data for each buffer. Table25-7 describes RxBD s tatus and control fields. Figure 25-6. SCC Ethernet RxBD Table25-7. SCC Ethernet RxBD Status and Control Field Descriptions Table25-6. PSMR Field Descriptions Table25-7. SCC Ethernet RxBD Status and Control Field Descriptions (continued) Figure 25-7. Ethernet Receiving using RxBDs 25.19 SCC Ethernet Transmit Buffer Descriptor Table25-8 describes TxBD status and control fields. Figure 25-8. SCC Ethernet TxBD Table25-8. SCC Ethernet TxBD Status and Control Field Descriptions 25.20 SCC Ethernet Event Register (SCCE)/Mask Register (SCCM) Freescale Semiconductor 25-21 Figure 25-10 shows an example of interrupts that can be generated in Ethernet protocol. Figure 25-10. Ethernet Interrupt Events Example Table25-9. SCCE/SCCM Field Descriptions (continued) Bits Name Description 25.21 SCC Ethernet Programming Example Page Page Chapter 26 SCC AppleTalk Mode 26.1 Operating the LocalTalk Bus 26.2 Features 26.3 Connecting to AppleTalk 26.4 Programming the SCC in AppleTalk Mode 26.4.1 Programming the GSMR 26.4.2 Programming the PSMR 26.4.3 Programming the TODR 26.4.4 SCC AppleTalk Programming Example Chapter 27 Serial Management Controllers (SMCs) 27.1 Features 27.2 Common SMC Settings and Configurations 27.2.1 SMC Mode Registers (SMCMR1/SMCMR2) Table27-1 describes SMCMR fields. Figure 27-2. SMC Mode Registers (SMCMR1/SMCMR2) Table27-1. SMCMR1/SMCMR2 Field Descriptions 27.2.2 SMC Buffer Descriptor Operation Table27-1. SMCMR1/SMCMR2 Field Description s (continued) 27.2.3 SMC Parameter RAM Table27-2. SMC UART and Transparent Parameter RAM Memory Map Table27-2. SMC UART and Transparent Parameter RAM Memory Map (continued) 27.2.3.1 SMC Function Code Registers (RFCR/TFCR) 27.2.4 Disabling SMCs On-the-F ly 27.2.4.1 SMC Transmitter Full Sequence 27.2.4.2 SMC Transmitter Shortcut Sequence 27.2.4.3 SMC Receiver Full Sequence 27.2.4.4 SMC Receiver Shortcut Sequence 27.2.4.5 Switching Protocols 27.3 SMC in UART Mode 27.3.1 Features 27.3.2 SMC UART Channel Transmission Process 27.3.3 SMC UART Channel Reception Process 27.3.4 Programming the SMC UART Controller 27.3.5 SMC UART Transmit and Receive Commands 27.3.6 Sending a Break 27.3.7 Sending a Preamble 27.3.8 Handling Errors in the SMC UART Controller 27.3.9 SMC UART RxBD Table27-7 describes RxB D fields. Figure 27-6. SMC UART RxBD Table27-7. SMC UART RxBD Field Descriptions Page Figure 27-7. RxBD Example 27.3.10 SMC UART TxBD Table27-8 describes SMC UART TxBD fields. Figure 27-8. SMC UART TxBD Table27-8. SMC UART TxBD Field Descriptions 27.3.11 SMC UART Event Register (SMCE)/Mask Register (SMCM) 27.3.12 SMC UART Controller Programming Example 27.4 SMC in Transparent Mode 27.4.1 Features 27.4.2 SMC Transparent Channel Transmission Process 27.4.3 SMC Transparent Channel Reception Process 27.4.4 Using SMSYN for Synchronization Figure27-11. Synchronization with SMSYN 27.4.5 Using the Time-Slot Assigner (TSA) for Synchronization Page 27.4.6 SMC Transparent Commands The SMC uses BDs and the SMCE to report message send and receive errors. Table27-10 describes transmit commands issued to the CPCR. Table27-11 describes receive commands issued to the CPCR. 27.4.7 Handling Errors in the SMC Transparent Controller 27.4.8 SMC Transparent RxBD Table27-13 describes SMC transparent RxBD fields. Table27-12. SMC Transparent Error Conditions Figure 27-13. SMC Transparent RxBD Table27-13. SM C Transparent RxBD Field Descriptions 27.4.9 SMC Transparent TxBD Table27-15 describes SMC transparent TxBD fields. Table27-14. SMC Transparent TxBD Table27-15. SMC Transparent TxBD Field Descriptions Table27-13. SMC Transparent RxBD Field Descriptions (continued) 27.4.10 SMC Transparent Event Register (SMCE)/Mask Register (SMCM) 27.4.11 SMC Transparent NMSI Programming Example 27.5 The SMC in GCI Mode 27.5.1 SMC GCI Parameter RAM 27.5.2 Handling the GCI Monitor Channel The following sections describe how the GCI monitor channel is handled. 27.5.2.1 SMC GCI Monitor Channel Transmission Process 27.5.2.2 SMC GCI Monitor Channel Reception Process Table27-17. SMC G CI Parameter RAM Memory Map 27.5.3 Handling the GCI C/I Channel 27.5.3.1 SMC GCI C/I Channel Transmission Process 27.5.3.2 SMC GCI C/I Channel Reception Process 27.5.4 SMC GCI Commands 27.5.5 SMC GCI Monitor Channel RxBD 27.5.6 SMC GCI Monitor Channel TxBD The CP uses this BD, seen in Figure 27-17, to report information about the C/I channel receive byte. 27.5.7 SMC GCI C/I Channel RxBD Table27-19. SMC Monitor Channel RxBD Field Descriptions Figure 27-16. SMC Monitor Channel TxBD Table27-20. SMC Mon itor Channel TxBD Field Descriptions 27.5.8 SMC GCI C/I Channel TxBD 27.5.9 SMC GCI Event Register (SMC E)/Mask Register (SMCM) Figure 27-17. SMC C/I Channel RxBD Table27-21. SMC C/I C hannel RxBD Field Descriptions Figure 27-18. SMC C/I Channel TxBD Table27-22. SMC C/I Channel TxBD Field Descriptions Table27-23 describes SMCE/SMCM fields. Page Chapter 28 Multi-Channel Controllers (MCCs) 28.1 MCC Operation Overview 28.1.1 MCC Data St ructure Organization Page 28.2 Global MCC Parameters The global MCC parameters are described in Table28-1. Table28-1. Global MCC Parameters 28.3 Channel-Specific Parameters Table28-2 describes channel-specific parameters for HDLC. 28.3.1 Channel-Sp ecific HDLC Parameters Table28-1. Global MCC Parameters (continued) Table28-2. Chan nel-Specific Parameters for HDLC 28.3.1.1 Internal Transmitter State (TSTATE)HDLC Mode TSTATE high-byte fields are described in Table28-3. Figure 28-2. TSTATE High Byte Table28-3. TSTATE High-Byte Field Descriptions Table28-2. Channel-Specific Parameters for HDLC (continued) 28.3.1.2 Interrupt Mask (INTMSK)HDLC Mode 28.3.1.3 Channel Mode Register (CHAMR)HDLC Mode Table28-4. CHAMR Field Descriptions 28.3.1.4 Internal Receiver State (RSTATE)HDLC Mode RSTATE high-byte fields are described in Table28-5. Figure28-5. Rx Internal State (RSTATE) High Byte Table28-5. RSTATE High-Byte Field Descriptions Table28-4. CHAMR Field Descriptions (continued) 28.3.2 Channel-Specific Transparent Parameters Table28-6 describes channe l-specific parameters for transparent operation. Table28-6. Channel-Specific Parameters for Transparent Operation Table28-5. RSTATE High-Byte Field Descriptions (continued) 28.3.2.1 Internal Transmitter State (TSTATE)Transparent Mode 28.3.2.2 Interrupt Mask (INTMSK)Transparent Mode Table28-6. Channel-Speci fic Parameters for Transparent Operation (continued) 28.3.2.3 Channel Mode Register (CHAMR)Transparent Mode CHAMR fields are described in Table28-4. 28.3.2.4 Internal Receiver State (RSTATE)Transparent Mode 28.3.3 MCC Parameters for AAL1 CES Usage Table28-7. CHAMR Field De scriptionsTransparent Mode (continued) 28.3.3.1 Channel-Specific ParametersAAL1 CES 28.3.3.2 Channel Mode Register (CHAMR)AAL1 CES The CHAMR in CES mode fields are described in Table28-7. Figure 28-8. Channel Mode Register (CHAMR)CES Mode Table28-9. CHAMR Field DescriptionsCES Mode 28.3.4 Channel-Specific SS7 Parameters Page Table28-10. C hannel-Specific Parameters for SS7 Table28-10. Channel-Specific Parameters for SS7 (continued) 28.3.4.1 Extended Channel Mode Register (ECHAMR)SS7 Mode Table28-10. Channel-Specific Parameters for SS7 (continued) ECHAMR fields are described in Table 28-11. Figure 28-9. Extended Channel Mode Register (ECHAMR) Table28-11. ECHAMR Fields Description 28.3.4.2 Signal Unit Error Monitor (SUERM)SS7 Mode 28.3.4.3 SS7 Configuration RegisterSS7 Mode Table28-13 describes SS7 configurat ion register fields. The SS7 configuration register, shown on Figure28-10 contains additional SS7 parameters. Table28-12. Parameter Values for SUERM in Japanese SS7 Page 28.3.4.4 SU FilteringSS7 Mode Page 28.3.4.5 Octet Counting ModeSS7 Mode 28.4 Channel Extra Parameters 28.5 Superchannels 28.5.1 Superchannel Table 28.5.2 Superchannels and Receiving 28.5.3 Transparent Slot Synchronization 28.5.4 Superchannelling Program ming Examples Page Figure28-15. Receiver Super Channel with Slot Synchronization Example Figure 28-16. Receiver Super Channel without Slot Synchronization Example 28.6 MCC Configuration Registers (MCCF Table28-15 describes M CCF fields. Figure 28-17. SI MCC Configuration Register (MCCF) Table28-15. M CCF Field Descriptions 28.7 MCC Commands 28.8 MCC Exceptions Table28-17. MCC Commands Page 28.8.1 MCC Event Register (MCCE)/Ma sk Register (MCCM) 28.8.1.1 Interrupt Circular Table Entry Table28-19. Inter rupt Circular Table Entry Field Descriptions 28.8.1.2 Global Transmitter Underrun (GUN) Page 28.8.1.3 Recovery from GUN Errors 28.8.1.4 Global Overrun (GOV) 28.9 MCC Buffer Descriptors 28.9.1 Receive Buffer Descript or (RxBD) Table28-22. RxBD Field Descriptions 28.9.2 Transmit Buffer Descriptor (TxBD) Table28-23 describes TxBD fields. Figure 28-22. MCC Transmit Buffer Descriptor (TxBD) Table28-23. TxBD Field Descriptions 28.10 MCC Initialization and Start/Stop Sequence 28.10.1 Stopping and Restarting a Single-Channel 28.10.2 Stopping and Restarti ng a Superchannel 28.11 MCC Latency and Performance Page Chapter 29 Fast Communications Controllers (FCCs) 29.1 Overview Page Figure 29-1. FCC Block Diagram 29.2 General FCC Mode Registers (GFMR Table29-1. Internal Clocks to CPM Clock Frequency Ratio Table29-2. describes GFMR fields. Figure 29-2. General FCC Mode Register (GFMR) Table29-2. GFMR Register Field Descriptions Page Page 29.3 FCC Protocol-Specific Mode Registers (FPSMR 29.4 FCC Data Synchronization Registers (FDSR 29.5 FCC Transmit-on-Demand Registers (FTODR 29.6 FCC Buffer Descriptors Page 29.7 FCC Parameter RAM Table29-4. FCC Parameter RAM Common to All Protocols except ATM 29.7.1 FCC Function Code Regis ters (FCR Figure 29-7. Function Code Register (FCR Table29 -4. FCC Parameter RAM Common to All Protocols except ATM (continued) 29.8 Interrupts from the FCCs 29.8.1 FCC Event Registers (FCCE 29.8.2 FCC Mask Registers (FCCM 29.8.3 FCC Status Registers (FCCS 29.9 FCC Initialization 29.10 FCC Interrupt Handling 29.10.1 FCC Transmit Errors 29.10.1.1 Re-Initialization Procedure 29.10.1.2 Recovery Sequence 29.10.1.3 Adjusting Transmitter BD Handling 29.11 FCC Timing Control Figure 29-8. Output Delay from RTS Asserted Figure 29-9. Output Delay from CTS Asserted Figure 29-10. CTS Lost 29.12 Disabling the FCCs On-the-Fly 29.12.1 FCC Transmitter Full Sequence 29.12.2 FCC Transmitter Shortcut Sequence 29.12.3 FCC Receiver Ful l Sequence 29.12.4 FCC Receiver Sh ortcut Sequence 29.12.5 Switching Protocols 29.13 Saving Power Chapter 30 ATM Controller and AAL0, AAL1, and AAL5 30.1 Features Page Page 30.2 ATM Controller Overview 30.2.1 Transmitter Overview 30.2.1.1 AAL5 Transmitter Overview 30.2.1.2 AAL1 Transmitter Overview 30.2.1.3 AAL0 Transmitter Overview 30.2.1.4 AAL2 Transmitter Overview 30.2.2 Receiver Overview 30.2.2.1 AAL5 Receiver Overview 30.2.2.2 AAL1 Receiver Overview 30.2.2.3 AAL0 Receiver Overview 30.2.2.4 AAL2 Receiver Overview 30.2.3 Performance Monitoring 30.3 ATM Pace Control (APC) Unit 30.3.1 APC Modes and ATM Service Types 30.3.2 APC Unit Scheduling Mechanism 30.3.3 Determining the Sche duling Table Size 30.3.3.1 Determining the Cells Per Slot (CPS) in a Scheduling Table 30.3.3.2 Determining the Number of Slots in a Scheduling Table 30.3.4 Determining the Time-Slot Scheduling Rate of a Channel 30.3.5 ATM Traffic Type 30.3.5.1 Peak Cell Rate Traffic Type 30.3.5.2 Determining the PCR Traffic Type Parameters 30.3.5.3 Peak and Sustain Traffic Type (VBR) 30.3.5.4 Peak and Minimum Cell Rate Traffic Type (UBR+) 30.3.6 Determining the Priority o f an ATM Channel 30.4 VCI/VPI Address Lookup Mechanism 30.4.1 External CAM Lookup 30.4.2 Address Compression 30.4.2.1 VP-Level Address Compression Table (VPLT) 30.4.2.2 VC-Level Address Compression Tables (VCLTs) 30.4.3 Misinserted Cells 30.4.4 Receive Raw Cell Queue 30.5 Available Bit Rate (ABR) Flow Control 30.5.1 The ABR Model 30.5.1.1 ABR Flow Control Source End-System Behavior 30.5.1.2 ABR Flow Control Destination End-System Behavior 30.5.1.3 ABR Flowcharts Figure 30-11. ABR Transmit Flow Figure 30-12. ABR Transmit Flow (Continued) Figure 30-13. ABR Transmit Flow (Continued) Figure 30-14. ABR Receive Flow 30.5.2 RM Cell Structure 30.5.2.1 RM Cell Rate Representation Figure 30-16. Rate Formula for RM Cells Table30-7. Fields and th eir Positions in RM Cells Figure 30-15. Rate Format for RM Cells 30.5.3 ABR Flow Control Setup 30.6 OAM Support 30.6.1 ATM-Layer OAM Definitions 30.6.2 Virtual Path (F4) Flow Mechanism 30.6.3 Virtual Channel (F5) Flow Mechanism 30.6.4 Receiving OAM F4 or F5 Cells 30.6.5 Transmitting OAM F4 or F5 Cells 30.6.6 Performance Monitoring 30.6.6.1 Running a Performance Block Test 30.6.6.2 PM Block Monitoring 30.6.6.3 PM Block Generation 30.6.6.4 BRC Performance Calculations 30.7 User-Defined Cells (UDC) 30.7.1 UDC Extended Address Mode (UEAD) 30.8 ATM Layer Statistics 30.9 ATM-to-TDM Interworking 30.9.1 Automatic Data Forwa rding 30.9.2 Using Interrupts in Automatic Data Forwarding 30.9.3 Timing Issues 30.9.4 Clock Synchronization (SRTS and Adaptive FIFOs) 30.9.5 Mapping TDM Time Sl ots to VCs 30.9.6 CAS Support 30.9.7 Trunk Condition 30.10 ATM Memory Structure 30.10.1 Parameter RA M Page Page 30.10.1.1 Determining UEAD_OFFSET (UEAD Mode Only) 30.10.1.2 VCI Filtering (VCIF) Table30-12. UEAD_OFF SETs for Extended Addresses in the UDC Extra Header Figure 30-22. VCI Filtering Enable Bits Table30-13. VCI F iltering Enable Field Descriptions 30.10.1.3 Global Mode Entry (GMODE) Figure 30-23 shows the layout of the global mode entry (GMODE). Table30-14 describes GMODE fields. Figure 30-23. Global Mode Entry (GMODE) Table30-14. GMODE Field Descri ptions 30.10.2 Connection Tables (RCT, TCT, and TCTE) 30.10.2.1 ATM Channel Code 30.10.2.2 Receive Connection Table (RCT) Table30-16 describes RCT fields. Figure 30-25. Receive Connection Table (RCT) Entry Table30-16. RCT Field Descriptions Table30-16. RCT Field Descriptions (continued) Table30-17 describes AAL 5 protocol specific RCT fields. Figure 30-26. AAL5 Protocol-Specific RCT Table30-17. RCT Settings (AAL5 Protocol-Specific) Table30-18 describes AAL5-ABR protocol-specific RCT fields. Figure 30-28. AAL1 Protocol-Specif ic RCT Table30-19 describes AAL 1 protocol-specific RCT fields. Table30-19. AAL1 Protocol-Specific RCT Field Descriptions Table30-20 describes AAL 0 protocol specific RCT fields. Figure 30-29. AAL0 Protocol-Specif ic RCT Table30-20. AAL0-Specific RCT Field Descriptions Table30-19. AAL1 Protocol-Specific RCT Field Descriptions (continued) 30.10.2.3 Transmit Connection Table (TCT) Figure 30-30. Transmit Connection Table (TCT) Entry Figure 30-30 shows the format of an TCT entry. Table30-20. AAL0-Specific RCT Field Descriptions (continued) Page Page Table30-21. TCT Field Descriptions Table30-21. TCT Field Descriptions (continued) 30.10.2.3.1 AAL5 Protocol-Specific TCT Figure 30-31 shows the AAL5 protocol-specific TCT. Table30-22 describes AAL 5 protocol-specific TCT fields. 30.10.2.3.2 AAL1 Protocol-Specific TCT Figure 30-32 shows the AAL1 protocol-specific TCT. Figure30-31. AAL5 Protocol-Specific TCT Table30-22. AAL5-Specific T CT Field Descriptions Table30-21. TCT Field Descriptions (continued) Table30-23 describes AAL 1 protocol-specific TCT fields. Figure30-32. AAL1 Protocol-Specific TCT Table30 -23. AAL1 Protocol-Specific TCT Field Des criptions Page Table30-25 describes VBR protocol-specific TCTE fields. 30.10.2.3.7 UBR+ Protocol-Specific TCTE Figure 30-35 shows the UBR+ protocol-specific TCTE. Table30-26 describes UBR+ protocol-specific TCTE fields. 30.10.2.3.8 ABR Protocol-Specific TCTE Figure 30-36 shows the ABR protocol-specific TCTE. Table30-27 describes ABR -specific TCTE fields. Figure 30-36. ABR Protocol-Specific TCTE Table30-27. ABR-Specific TCTE Field Desc riptions Table30-27. ABR-Specific TCTE Field Desc riptions (continued) 30.10.3 OAM Performance Monitoring Tables 30.10.4 APC Data Structure Table30 -28. OAMPerformance Monitoring Table Field D escriptions Figure 30-38. ATM Pace Control Data Structure 30.10.4.1 APC Parameter Tables Table30-29. APC Parameter Table 30.10.4.2 APC Priority Table Slot N+1 is used as a control slot, as shown in Figure30-40. 30.10.4.3 APC Scheduling Tables Figure30-39. The APC Scheduling Table Structure Table30-30. APC Priority Table Entry 30.10.5 ATM Controller Buffer Descriptors (BDs) 30.10.5.1 Transmit Buffer Operation 30.10.5.2 Receive Buffer Operation Page Figure 30-43. Receive Global Buffer Allocation Example Figure 30-44. Free Buffer Pool Structure Figure 30-45 describes the structure of a free buffer pool entry. Table30-32 describes free buffer pool entr y fields. Figure 30-45. Free Buffer Pool Entry Table30-32. Free Buffer Pool Entry Field Descriptions Table30-33. Free Buffer Pool Parameter Table 30.10.5.3 ATM Controller Buffers Table30-34 describes properties of the ATM receive and transmit buffers. Figure 30-46. AAL5 RxBD Figure 30-46 shows the AAL5 RxBD. 30.10.5.4 AAL5 RxBD Table30-35 describes AAL 5 RxBD fields. 30.10.5.5 AAL1 RxBD Figure 30-47 shows the AAL1 RxBD. Figure 30-47. AAL1 RxBD Table30-36 describes AAL 1 RxBD fields. Table30-35. AAL5 RxBD Field Descriptions (continued) 30.10.5.6 AAL0 RxBD Figure 30-48 shows the AAL0 RxBD. Figure 30-48. AAL0 RxBD Table30-37 describes AAL 0 RxBD fields. Table30-36. AAL1 RxBD Field Descriptions 30.10.5.7 AAL1 CES RxBD Refer to Section 31.12.1, AAL1 CES RxBD. Refer to Section 32.4.4.4, CPS Receive Buffer Descriptor (RxBD). 30.10.5.8 AAL2 RxBD Table30-37. AAL0 RxBD Field Descriptions 30.10.5.9 AAL5, AAL1 CES User-Defined CellRxBD Extension 30.10.5.10 AAL5 TxBDs 30.10.5.11 AAL1 TxBDs Figure 30-51 shows the AAL1 TxBD. Table30-38. AAL5 TxBD Field Descriptions Table30-39 describes AAL 1 TxBD fields. 30.10.5.12 AAL0 TxBDs Figure 30-51. AAL1 TxBD Table30-39. AAL1 TxBD Field Descriptions Table30-40 describes AAL 0 TxBD fields. 30.10.5.13 AAL1 CES TxBDs Refer to Section 31.12.2, AAL1 CES TxBDs Figure 30-52. AAL0 TxBDs Table30-40. AAL0 TxBD Field Descriptions 30.10.5.14 AAL2 TxBDs 30.10.5.15 AAL5, AAL1 User-Defined CellTxBD Extension 30.10.6 AAL1 Sequence Number (SN) P rotection Table 30.10.7 UNI Statistics Table 30.11 ATM Exceptions 30.11.1 Interrupt Queues 30.11.2 Interrupt Queue Entry 30.11.3 Interrupt Queue Parameter Tables Table30-42. Interrupt Queue Entry Field Description Table30-43. I nterrupt Queue Parameter Table 30.12 The UTOPIA Interface Table30-44 describes UTOPIA master mode signals. 30.12.1 UTOPIA Interface Master Mode Figure 30-57. UTOPIA Master Mode Signals Table30-44. UTOPIA Master Mode Signal Descriptions 30.12.1.1 UTOPIA Master Multiple PHY Operation Table30-44. UTOPIA Master Mode Signal Descriptions (continued) 30.12.2 UTOPIA Interface Slave Mode Figure 30-58. UTOPIA Slave Mode Signals Table30-45 describes UTOPIA slave mode signals. Table30-45. UTOPIA Slave Mod e Signals 30.12.2.1 UTOPIA Slave Multiple PHY Operation 30.13 ATM Registers 30.13.1 General FCC Mode Register (GFMR) Table30-47 describes FPSMR fields. 30.13.2 FCC Protocol-Specific Mode Register (FPSMR) Figure 30-59. FCC ATM Mode Register (FPSMR) Table30-47. FCC ATM Mode Register (FPSMR) Table3 0-47. FCC ATM Mode Register (FPSM R) (continued) 30.13.3 ATM Event Register (FCCE)/Mask Register (FCCM) Table3 0-47. FCC ATM Mode Register (FPSM R) (continued) Table30-48 describes FCCE fields. 30.13.4 FCC Transmit Internal Rate Registers (FTIRR (FCC1 and FCC2 Only) Page 30.14 ATM Transmit Command 30.15 SRTS Generation and Clock Recovery Using External Logic 30.16 Configuring the ATM Controller for Maximum CPM Performance 30.16.1 Using Transmit Internal Rate Mode 30.16.2 APC Configuration 30.16.3 Buffer Configuration Chapter 31 ATM AAL1 Circuit Emulation Service 31.1 Features Page 31.2 AAL1 CES Transmitter Overview 31.2.1 Data Path 31.2.2 Signalin g Path 31.3 AAL1 CES Receiver Overview Page 31.4 Interworking Functions Multiplexing low speed services, such as voice and data, onto one ATM connection 31.4.1 Automatic Data Forwarding 31.4.1.1 ATM-to-TDM 31.4.1.2 TDM-to-ATM 31.4.2 Timing Issues 31.4.3 Clock Synchronization (SRTS, Adaptive FIFO) 31.4.4 Mapping TDM Time Slots to VCs 31.4.5 Trunk Condition 31.4.6 Channel Associated Signaling (CAS) Suppor t Figure 31-8. Internal CAS Block Formats 31.4.7 Mapping VC Signaling to CAS Blocks Figure 31-9. Mapping CAS Entry 31.4.7.1 CAS Routing Table Figure 31-11. AAL1 CES CAS Routing Table Entry Figure 31-10. AAL1 CES CAS Routing Table (CRT) Figure 31-11 describes the structure of a CAS routing table entry. 31.4.7.2 TDM-to-ATM CAS Support 31.4.7.3 ATM-to-TDM CAS Support 31.5 ATM-to-TDM Adaptive Slip Control 31.5.1 CES Adaptive Threshold Tables Table31-2 describes CES ada ptive threshold table fields. Figure 31-16. Pre-Underrun Sequence Figure 31-17. Pre-Overrun Sequence 31.6 3-Step-SN Algorithm 31.6.1 The Three St ates of the Algorithm 31.7 Pointer Verification Mechanism 31.8 AAL-1 Memory Structure 31.8.1 AAL1 CES Parameter RAM Page Table31-3. AAL1 C ES Field Descriptions (continued) Additional CES parameters needed by the AAL1 microcode are described in the following table. 31.9 Receive and Transmit Connection Tables (RCT, TCT) Table31-4. AAL1 CES Parameters 31.9.1 Receive Connection Table (RCT) Table31 -5. RCT Field Descriptions 31.9.1.1 AAL1 CES Protocol-Specific RCT Figure 31-22 shows the AAL1 CES protocol-specific area of an RCT entry. Figure 31-22. AAL1 CES Protoc ol-Specific RCT Table31-5. RCT Field Descriptions (continued) Table31-6 describes AAL1 C ES protocol-specific RCT fields. Figure 31-22. AAL1 CES Protoc ol-Specific RCT Table31-6. AAL1 CES Protocol-Specific RCT Field Descriptions Table31-6. AAL1 CES Protocol-Specific RCT Field Descriptions (continued) 31.9.2 Transmit Connection Table (TCT) Figure 31-23 shows the format of an TCT entry. Figure 31-23. Transmit Connection Table (TCT) Entry Table31-7 describes general TCT fields. Table31-7. TCT Field Descriptions Table31-7. TCT Field Descriptions (continued) 31.9.2.1 AAL1 CES Protocol-Specific TCT Figure 31-24 shows the AAL1 CES protocol-specific transmission connection tables (TCT). Table31-8 describes AAL1 C ES protocol-specific TCT fields. 31.10 Outgoing CAS Status Register (OCASSR) Figure31-25. Outgoing CAS Status Register (OCASSR) Table31-9. OC ASSR Field Descriptions Table31 -8. AAL1 CES Protocol-Specific TCT Field Des criptions (continued) 31.11 Buffer Descriptors 31.11.1 Transmit Buffer Operation Figure 31-26. Transmit Buffers and BD Table Example 31.11.2 Receive Buffer Operation Figure 31-27. Receive Buffers and BD Table Example 31.12 ATM Controller Buffers Table31-10 describes properties of the ATM receive and transmit buffers. Figure 31-28 shows the AAL1 CES RxBD. 31.12.1 AAL1 CES RxBD Table31-10. Receive an d Transmit Buffers Table31-11 describes AAL1 CES RxBD fields. Figure 31-28. AAL1 CES RxBD Table31-11. AAL1 CES RxBD Field Descriptions 31.12.2 AAL1 CES TxBDs Figure 31-29 shows the AAL1 CES TxBD. Table31-12 describes AAL1 C ES TxBD fields. Figure 31-29. AAL1 CES TxBD Table31-12. AAL1 CES TxBD Field Descriptions 31.13 AAL1 CES Exceptions 31.13.1 AAL1 CES Interrupt Queue Entry 31.14 AAL1 Sequence Number (SN) Protection Table Table31-13. AAL1 CES Interrupt Queue Entr y Field Descriptions (continued) 31.15 Internal AAL1 CES Statistics Tables Figure 31-31. AAL1 Sequence Number (SN) Protection Table Table31-14. AAL1 CES DPR Statistics Table 31.16 External AAL1 CES Statistics Tables 31.17 CES-Specific Additions to the MCC 31.18 Application Considerations Page Page Chapter 32 ATM AAL2 32.1 Introduction Page X 32.2 Features Page 32.3 AAL2 Transmitter 32.3.1 Transmitter Overview 32.3.2 Transmit Priority Mechanism 32.3.2.1 Round Robin Priority 32.3.2.2 Fixed Priority 32.3.3 Partial Fill Mode (PFM) 32.3.4 No STF Mode 32.3.5 AAL2 Tx Data Structures 32.3.5.1 AAL2 Protocol-Specific TCT Page Page Page 32.3.5.2 CPS Tx Queue Descriptor Table32-2 describes the CPS TxQD fields. . Figure 32-7. CPS Tx Queue Descriptor (TxQD) Table32-2. CPS TxQD Field Descriptions 32.3.5.3 CPS Buffer Structure Figure 32-9 shows a CPS TxBD. Figure 32-8. Buffer Structure Example for CPS Packets Table32-2. CPS TxQD Field Descriptions (continued) Table32-3 describes the CPS TxBD fields. Figure 32-9. CPS TxBD Table32-3. CPS TxBD Field Descriptions 32.3.5.4 SSSAR Tx Queue Descriptor . 32.3.5.5 SSSAR Transmit Buffer Descriptor Figure 32-12. SSSAR TxBD Table32-5. SSSAR T xBD Field Descriptions 32.4 AAL2 Receiver 32.4.1 Receiver Overview 32.4.2 Mapping of PHY | VP | VC | CID 32.4.3 AAL2 Switching 32.4.4 AAL2 RX Data Structures 32.4.4.1 AAL2 Protocol-Specific RCT Page Table32-6. AAL2 Protocol-Specific RCT Field Descriptions 32.4.4.2 CID Mapping Tables and RxQDs 32.4.4.3 CPS Rx Queue Descriptors 32.4.4.4 CPS Receive Buffer Descriptor (RxBD) Figure 32-17. CPS Receive Buffer Descriptor Table32-8 describes the CPS RxBD fields. Table32-7. CPS RxQD Field Descriptions 32.4.4.5 CPS Switch Rx Queue Descriptor The switch RxQD, shown in Figure32-18, is used for CIDs that are being switched from one PHY1|VP 2|CID 2|VC 1 to another PHY2|VP 32.4.4.6 SWITCH Receive/Transmit Buffer Descriptor (RxBD) Figure 32-19. Switch Receive/Transmit Buffer Descriptor Table 3-11 describes the Switch RxBD fields. Figure 32-18. CPS Switch Rx Queue Descriptor Table32-9. CPS Switch RxQD Field Descriptions 32.4.4.7 SSSAR Rx Queue Descriptor Table32-10. Switch RxBD Field Descriptions Table32-11 describes the SSSAR RxQD fields. Figure 32-20. SSSAR Rx Queue Descriptor Table32-11. SSSAR Rx QD Field Descriptions 32.4.4.8 SSSAR Receive Buffer Descriptor Figure 32-21. SSSAR Receive Buffer Descriptor Table32-12 describes the SSSAR RxBD fields. Table32-11. SS SAR RxQD Field Descriptions (continued) Table32-12. SSSAR R xBD Field Descriptions 32.5 AAL2 Parameter RAM Table32-13. AAL2 Parameter RAM . Table32-13. AAL2 Parameter RAM (continued) 32.6 User-Defined Cells in AAL2 32.7 AAL2 Exceptions Table32-14 describes the interrupt queue entry fields for a CID. An interrupt entry for the VC is shown in Figure 32-24. Figure 32-24. AAL2 Interrupt Queue Entry CID = 0 Table32-15. AAL2 Inter rupt Queue Entry CID = 0 Field Descriptions Page Page 33.1.1 References 33.1.2 IMA Versions Supported 33.1.3 PowerQUICC II Versions Supported 33.1.4 PHY-Layer Devices Suppor ted 33.1.5 ATM Features Not Supported 33.2 IMA Protocol Overview 33.2.1 Introduction 33.2.2 IMA Frame Overview Page 33.2.3 Overview of IMA Cells 33.2.3.1 IMA Control Cells Page Page Figure 33-4. IMA Frame and ICP Cell Formats 33.2.3.2 IMA Filler Cells 33.3 IMA Microcode Architecture This chapter explains the architecture of the receive and transmit IMA microcode tasks. 33.3.1 IMA Function Partitioning IMA Frame 33.3.1.1 User Plane Functions Performed by Microcode 33.3.2 Transmit Architecture 33.3.2.1 TRL Operation 33.3.2.2 Non-TRL Operation 33.3.2.3 Transmit Queue Operation Examples (ITC mode) Figure 33-8. Transmit Queue Behavior: Link Clock Rate Slower than TRL Figure 33-9. Transmit Queue Behavior: Link Clock Rate Faster than TRL, Worst-Case Event Sequence 33.3.2.4 Differences in CTC Operation is held off for minimum 33.3.3 Receive Architecture 33.3.3.1 Cell Reception Task Page Cell Reception Task Configuration to reach to move to next state No Link Defect - According to the Links state, the Microcode executes dif ferent Tasks - Each IMA Link follows a Four-State Ma chine Page Page 33.3.3.2 Cell Processing Activation Function Page 33.3.3.3 Cell Processing Task 33.4 IMA Programming Model 33.4.1 Data Structure Organ ization Page 33.4.2 IMA FCC Programming 33.4.2.1 FCC Registers 33.4.2.2 FCC Parameters 33.4.2.3 IMA-Specific FCC Parameters IMAROOT must be programmed to a 128-byte aligned address terminating with 0x80 (i.e. 0xnn80). 33.4.3 IMA Root Table Table33 -3. IMA Root Table1 (continued) 33.4.3.1 IMA Control (IMACNTL) 33.4.4 IMA Group Tables 33.4.4.1 IMA Group Transmit Table Entry Table33-5. IMA Group Transmit Table Entry Figure 33-14. IMA Group Transmit Control (IGTCNTL) Table33-6. IGTCNTL Field Descriptions Table33-5. IMA Group Transmit Table Entry (continued) Page Page Table 33-9. ICP Cell Tem plate (continued) parameters are managed by the microcode and should be initialized to zero unless otherwise stated. Table 33-9. ICP Cell Tem plate (continued) 33.4.4.2 IMA Group Receive Table Entry Table33-10. IMA Group Receive Table Entry Table33-10. IMA Group Re ceive Table Entry (continued) Figure 33-17. IMA Group Receive Control (IGRCNTL) Table33-10. IMA Group Re ceive Table Entry (continued) 33.4.4.2.3 IMA Receive Group Frame Size The fields of the IRGFS register are shown in Figure33-19. Table33-11. IGRCNTL Field Descriptions Figure 33-18. IMA Group Receive State (IGRSTATE) Table33-12. IGRSTATE Field Descriptions Page 33.4.5 IMA Link Tables 33.4.5.1 IMA Link Transmit Table Entry Table33-14. R eceive Group Order Table Entry Field Descriptions Table33-15. IMA Link Transmit Table Entry Figure 33-21. IMA Link Transmit Control (ILTCNTL) Table33-16. ILTCNTL Field Descriptions Table33 -15. IMA Link Transmit Table Entry (con tinued) Figure 33-23. IMA Transmit Interrupt Status (ITINTSTAT) Figure 33-22. IMA Link Transmit State (ILTSTATE) Table33-17. ILTSTATE Field Descriptions Table33-16. ILTCNTL Field Descriptions (continued) Table33-18 describes the ITINTSTAT bit fields. 33.4.5.2 IMA Link Receive Table Entry Table33-18. ITINTSTAT Field Descriptions Table33 -19. IMA Link Receive Table Entry Table33 -19. IMA Link Receive Table Entry1 (continued) Table33-20 describes the ILRCNTL bit fields. Figure 33-24. IMA Link Receive Control (ILRCNTL) Table33-20. ILRCNTL Field Descriptions Table33-21 describes the ILRSTATE bit fields. Figure 33-25. IMA Link Receive State (ILRSTATE) Table33-21. ILRSTATE Field Descriptions 33.4.5.3 IMA Link Receive Statistics Table 33.4.6 Structures in External Memory 33.4.6.1 Transmit Queues 33.4.6.2 Delay Compensation Buffers (DCB) 33.4.7 IMA Exceptions 33.4.7.1 IMA Interrupt Queue Entry 33.4.7.2 ICP Cell Reception Exceptions Table33-23. IMA I nterrupt Queue Entry Field Descriptions 33.4.8 IDCR Timer Programming 33.4.8.1 IDCR Master Clock 33.4.8.2 IDCR FCC Parameter Shadow Page 33.4.8.3 IDCR_Init Command 33.4.8.4 IDCR Root Parameters 33.4.8.5 IDCR Table Entry 33.4.8.6 IDCR Counter Algorithm 33.4.8.7 IDCR Events 33.4.9 APC Programming for IMA 33.4.9.1 Programming for CBR, UBR, VBR, and UBR+ 33.4.9.2 Programming for ABR 33.4.10 Changing IMA Version 33.5 IMA Software Interface and Requirements 33.5.1 Software M odel 33.5.2 Initialization Procedure 33.5.3 Software Responsibilities 33.5.3.1 System Definition 33.5.3.2 General Operation 33.5.3.3 Receive Link State Machine Control 33.5.3.4 Receive Group State Machine Control 33.5.3.5 Transmit Link State Machine Control 33.5.3.6 Transmit Group State Machine Control 33.5.3.7 Group Symmetry Control 33.5.3.8 ICP End-to-End Channel Transmission 33.5.3.9 Link Addition and Slow Recovery (LASR) Procedure 33.5.3.10 Failure Alarms 33.5.4 IMA Software Procedures 33.5.4.1 Transmit ICP Cell Signalling 33.5.4.2 Receive Link Start-up Procedure 33.5.4.3 Group Start-up Procedure Page 33.5.4.4 Link Addition Procedure Page 33.5.4.5 Link Removal Procedure 33.5.4.6 Link Receive Deactivation Procedure 33.5.4.7 Link Receive Reactivation Procedure 33.5.4.8 TRL On-the-Fly Change Procedure 33.5.4.9 Transmit Event Response Procedures 33.5.4.10 Receive Event Response Procedures Page 33.5.4.11 Test Pattern Procedure 33.5.4.12 IDCR Operation 33.5.4.13 End-to-End Channel Signalling Procedure Page Page Chapter 34 ATM Transmission Convergence Layer 34.1 Features Page 34.2 Functionality 34.2.1 Receive ATM Cell Functions Page 34.2.1.1 Receive ATM 2-Cell FIFO 34.2.2 Transmit ATM Cell Functions 34.2.2.1 Transmit ATM 2-Cell FIFO 34.2.3 Receive UTOPIA Interface 34.2.4 Transmit UTOPIA Interface 34.4.1.1 TC Layer Mode Register [18] (TCMODE 34.3 Signals 34.4 TC Layer Programming Mode 34.4.1 TC Layer Registers ) Table34-2 describes TCMODE fields. Figure 34-5. TC Layer Mode Register (TCMODEx) Table34-2. TCMO DEx Field Descriptions 34.4.1.2 Cell Delineation State Machine Register [18] (CDSMR Table34-3. CDSMR Figure 34-6. Cell Delineation State Machine Register (CDSMR Table34-3 describes CDSMR fields. Field Descriptions 34.4.1.3 TC Layer Event Register [18] (TCERx) Figure 34-7. TC Layer Event Register (TCER The TCER bits are described in Table 34-4. Table34-4. TCER Field Descriptions 34.4.2 TC Layer General Registers 34.4.2.1 TC Layer General Event Register (TCGER) 34.4.2.2 TC Layer General Status Register (TCGSR) 34.4.3 TC Layer Cell Counters 34.4.3.6 Filtered Cell Counter [18] (TC_FCC 34.4.4 Programming FCC2 34.4.5 Programming and Operating the TC Layer 34.4.5.1 Receive 34.4.5.2 Transmit Page 34.5 Implementation Example 34.5.1 Operating the TC Layer at Higher Frequen cies 34.5.2 Programming a T1 Application Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Step 7 Chapter 35 Fast Ethernet Controller 35.1 Fast Ethernet on the PowerQUICCII 35.2 Features Page 35.3 Connecting the PowerQUICCII to Fast Ethernet 35.4 Ethernet Channel Frame Transmission 35.5 Ethernet Channel Frame Reception 35.6 Flow Control 35.7 CAM Interface 35.8 Ethernet Parameter RAM For Ethernet mode, the protocol-specific area of the FCC parameter RAM is mapped as in Table35-2. Table35-2. Ethernet-Specific Parameter RAM Page Page 35.9 Programming Model The transmit and receive commands are issued to the CPCR; see Section14.4, Command Set. 35.10 Ethernet Command Set Receive commands that apply to Ethernet are described in Table 35-4. Table35-3. Transmit Commands Table35-4. Receive Commands 35.11 RMON Support 35.12 Ethernet Address Recognition Table35 -5. RMON Statistics and Counters (continued) Page 35.13 Hash Table Algorithm 35.14 Interpacket Gap Time 35.15 Handling Collisions 35.16 Internal and External Loopback 35.17 Ethernet Error-Handling Procedure Transmission errors are described in Table35-6. 35.18 Fast Ethernet Registers 35.18.1 FCC Ethernet Mode Register (FPSMR) Table35-6. Transmission Errors Table35 -7. Reception Errors Table35-8 describes FPSMR fields. Figure 35-5. FCC Ethernet Mode Registers (FPSMR) Table35-8. FPSMR Ethernet Field Descriptions 35.18.2 Ethernet Event Register (F CCE)/Mask Register (FCCM) Figure 35-6. Ethernet Even t Register (FCCE)/Mask Regist er (FCCM) Table35-8. FPSMR Ethernet Field Descriptions (continued) Table35-9 describes FCCE/FCCM fields. Figure 35-6. Ethernet Even t Register (FCCE)/Mask Regist er (FCCM) Figure 35-7 shows interrupts that can be generated in the Ethernet protocol. Table35-9. FCCE/FCCM Field Descriptions Figure 35-7. Ethernet Interrupt Events Example 35.19 Ethernet RxBDs Table35-10 describes Ethernet RxBD fields. Figure 35-8. Fast Ethernet Receive Buffer (RxBD) Table35-10. RxBD Field Descriptions Page Figure 35-9. Ethernet Receiving Using RxBDs 35.20 Ethernet TxBDs Table35-11 describes Ethernet TxBD fields . Figure 35-10. Fast Ethernet Transmit Buffer (TxBD) Table35-11. Ethernet TxBD Field Definitions Page Page Chapter 36 FCC HDLC Controller 36.1 Key Features 36.2 HDLC Channel Frame Transmission Processing 36.3 HDLC Channel Frame Reception Processing 36.4 HDLC Parameter RAM Figure 36-2 shows an example of using HMASK and HADDR[14]. Table36 -1. FCC HDLC-Specific Parameter RAM Memory Map (continued) Figure 36-2. HDLC Address Re cognition Example 36.5 Programming Model 36.5.1 HDLC Command Set Table36-2. Transmit Commands Table36-3 describes the receive commands that apply to the HDLC controller. 36.5.2 HDLC Error Handling Table36-5 describes HDLC reception errors, which are reported through the RxBD. Table36-3. Recei ve Commands Table36-4. HDLC Transmission Errors Table36-2. Transmit Commands (continued) 36.6 HDLC Mode Register (FPSMR) Table36-5. HDLC Reception Errors The FPSMR fields are described in Table36-6. Figure 36-3. HDLC Mode Register (FPSMR) Table36 -6. FPSMR Field Descriptions 36.7 HDLC Receive Buffer Descriptor (RxBD) Table36-6. FPSMR F ield Descriptions (continued) Figure 36-4. FCC HDLC Receiving Using RxBDs Figure 36-5 shows the FCC HDLC RxBD. Table36-7 describes RxB D fields. Figure 36-5. FCC HDLC Receive Buffer Descriptor (RxBD) Table36-7. RxBD field De scriptions 36.8 HDLC Transmit Buffer Descriptor (TxBD) Table36-8. HDLC TxBD F ield Descriptions 36.9 HDLC Event Register (FCCE)/Mask Register (FCCM) Figure 36-8 shows interrupts that can be generated in the HDLC protocol. Table36-9. FCCE/FCCM Field Descriptions Figure 36-8. HDLC Interrupt Event Example 36.10 FCC Status Register (FCCS) Figure 36-9. FCC Status Register (FCCS) Table36-10 describes FCCS bits. Table36-10. FCCS Register Field Descriptions Page Chapter 37 FCC Transparent Controller 37.1 Features 37.2 Transparent Channel Operation 37.3 Achieving Synchronization in Transparent Mode 37.3.1 In-Line S ynchronization Pattern 37.3.2 External Synchronization Signals 37.3.3 Transparent Synchronization Ex ample Figure 37-2. Sending Transparent Frames between PowerQUICCIIs Chapter 38 Serial Peripheral Interface (SPI) 38.1 Features 38.2 SPI Clocking and Signal Functions 38.3 Configuring the SPI Controller 38.3.1 The SPI as a Master Device 38.3.2 The SPI as a Slave Device 38.3.3 The SPI in Multimaster Operation Figure 38-3. Multimaster Configuration 38.4 Programming the SPI Registers Table38-1 describes the SPMODE fields. The following sections describe the registers used in configuring and operating the SPI. 38.4.1 SPI Mode Re gister (SPMODE) Figure 38-4. SPMODESPI Mode Register Table38-1. SPMODE Field Descriptions Figure 38-5. SPI Transfer Format with SPMODE[CP] = 0 Table38-1. SPMODE Field Descriptions (continued) Figure 38-6. SPI Transfer Format with SPMODE[CP] = 1 38.4.1.1 SPI Examples with Different SPMODE[LEN] Values Example 2 Example 1 Table38-2. Example Conventions with REV=1, the string is byte reversed and transmitted, a byte at a time, with lsb first: 38.4.2 SPI Event/Mask Registers (SPIE/SPIM) Table38-3 describes the SPIE/SPIM fields. Figure 38-7. SPIE/SPIMSPI Event/Mask Registers Table38-3. SPIE/SPIM Field Descriptions 38.4.3 SPI Command Register (SPCOM) 38.5 SPI Parameter RAM Table38-5. S PI Parameter RAM Memory Map 38.5.1 Receive/Transmit Function Code Registers (RFCR /TFCR) Figure 38-9 shows the fields in the receive/transmit function code registers (RFCR/TFCR). Table38-7 lists transmit/receive commands sent to the CP command register (CPCR). Table38-6 describes the RFCR/TFCR fields. 38.6 SPI Commands Figure 38-9. RFCR/TFCRFunction Code Registers Table38-6. RFCR/TFCR Field Descriptions Table38-7. SPI Commands 38.7 The SPI Buffer Descriptor (BD) Table 38.7.1 SPI Buffer Descriptors (BDs) 38.7.1.1 SPI Receive BD (RxBD) 38.7.1.2 SPI Transmit BD (TxBD) Table38-9 describes the TxBD status and control fields. Figure 38-12. SPI TxBD Table38-9. SPI TxBD Status and Control Field Descriptions Table38 -8. SPI RxBD Status and Control Field Descriptions (continu ed) 38.8 SPI Master Programming Example 38.9 SPI Slave Programmin g Example 38.10 Handling Interrupts in the SPI Chapter 39 I2C Controller 39.1 Features 39.2 I2C Controller Clocking and Signal Functions 39.3 I2C Controller Transfers 39.3.1 I2C Master Write (Slave Read) 39.3.2 I2C Loopback Testing 39.3.3 I2C Master Read (Slave Write) 39.3.4 I2C Multi-Master Considerations 39.4 I2C Registers The following sections describe the I2C registers. The I2C address register, shown in Figure 39-7, holds the address for this I2C port. 39.4.1 I2C Mode Register (I2MOD) The I2C mode register, shown in Figure39-6, controls the I2C modes and clock source. 39.4.3 I2C Baud Rate Generator Register (I2BRG) The I2C baud rate generator register, shown in Figure 39-8, sets the divide ratio of the I2C BRG. Table39-3 describes I2BRG fields. 39.4.4 I2C Event/Mask Registers (I2CER/I2CMR) Figure 39-7. I2C Address Register (I2ADD) Table39-2. I2ADD Field Descr iptions 39.4.5 I2C Command Register (I2COM) Table39-5 describes I2 COM fields. Figure 39-9. I2C Event/Mask Registers (I2CER/I2CMR) Table39-4. I2CER/I2CMR Field Descriptions Figure 39-10. I2C Command Register (I2COM) Table39-5. I2COM Field Descriptions 39.5 I2C Parameter RAM Table39-6. I2C Parameter RAM Memory Map Table39-5. I2COM Field Descriptions Figure 39-11 shows the RFCR/TFCR bit fields. Table39-7 describes the RFCR/TFCR bit fields. Figure 39-11. I2C Function Code Registers (RFCR/TFCR) Table39-7. RFCR/TFCR Field Descriptions Table39-6. I2C Parameter R AM Memory Map (continued) 39.6 I2C Commands 39.7 The I2C Buffer Descriptor (BD) Table Table39-8. I2C Transmit/Receive Commands Table39-7. RFCR/TFCR Field Descriptions 39.7.1 I2C Buffer Descriptors (BDs) 39.7.1.1 I2C Receive Buffer Descriptor (RxBD) Table39-9 describes I2C RxBD status and control bits. 39.7.1.2 I2C Transmit Buffer Descriptor (TxBD) Figure 39-13. I2C RxBD Table39-9. I2C RxBD Status and Control Bits Table39-10 describes I2C TxBD status and control bits. Figure 39-14. I2C TxBD Table39-10. I2C TxBD Status and Control Bits Chapter 40 Parallel I/O Ports 40.1 Features 40.2 Port Registers 40.2.1 Port Open-Drain Registers (PODRAPODRD) 40.2.2 Port Data Registers (PDATAPDATD) 40.2.3 Port Data Direction Registers (PDIRAPDIRD) The port data direction register(PDIR), shown in Figure40-3, is cleared at syst em res et. Table40-2 describes PDIR fi elds. Figure 40-2. Port Data Registers (PDATAPDATD) Figure 40-3. Port Data Direction Register (PDIR) Table40-2. PDIR Field Descriptions 40.2.4 Port Pin Assignment Register (PPAR) The port pin assignment register (PPAR) is cleared at system reset. Figure 40-5 shows the port special options registers (PSORx). Table40-2 describes PPARx fields. 40.2.5 Port Special Options Registers AD (PSORAPSOR D) 40.3 Port Block Diagram Figure 40-5. Special Options Registers (PSORAPOSRD) Table40-4. PSOR Field Descriptions Figure 40-6. Port Functional Operation 40.4 Port Pins Functions Each pin can operate as a general purpose I/O pin or as a dedicated input or output pin. 40.4.1 General Purpose I/O Pins 40.4.2 Dedicated Pins 40.5 Ports Tables Figure 40-7. Primary and Secondary Option Programming Table40-5. Port ADedicated Pin Assignment (PPARA = 1) Page Page Table40-6 shows the port B pin assignments. Table40-6. Port B Dedicated P in Assignment (PPARB = 1) Table40-6. Port B Dedicated Pin Assignment (PPARB = 1) (continued) Table40-7 shows the port C pin assignments. Table40-7. Port C Dedicated P in Assignment (PPARC = 1) Table40-6. Port B Dedicated Pin Assignment (PPARB = 1) (continued) Page Table40-7. Port C Dedicated Pin Assignment (PPARC = 1) (continued) Table40-8 shows the port D pin assignments. Table40-8. Port D Dedicated Pin Assignment (PPARD = 1) Table40-8. Port D Dedicated Pi n Assignment (PPARD = 1) (continued) 40.6 Interrupts from Port C Table40-8. Port D Dedicated Pi n Assignment (PPARD = 1) (continued) Page Appendix A Register Quick Reference Guide This section provides a brief guide to the core registers. Programming Environments Manual A.1 PowerPC RegistersUser Registers Tabl e A-2 lists SPRs defined by the PowerPC architecture implemented on the MPC8260. Tabl e A-4 lists supervisor-level SPRs defined by the PowerPC architecture. TableA-3. Supervisor-Level PowerPC Registers TableA-4. Supervisor-Level PowerPC SPRs A.3 MPC8260-Specific SPRs TableA-5. MPC8260-Sp ecific Supervisor-Level SPRs Page Appendix B Reference Manual (R ev 1) Errata NOTE B.1 Document Errata Page Page Page Page Page Page Page Page Page 33.3.2.1.1 TRL Service Latency 33.4.1.1, 33-29 Add the following two rows to the bottom of Table 33-5: 33.4.4.1.1, 33-29 Add ISIE to Figure 33-14 and Table 33-6, as shown in the following: 33.4.5.1.2, 33-40 Add LDC to Figure 33-22 and Table 33-17, as shown in the following: 33.4.4.1.2, 33-30 Add GTE and TRQS to Figure 33-15 and Table 33-7, as shown in the following: 33.4.10 Changing IMA Version Page Page Page Glossary of Terms and Abbreviations A B C See also D E F G see H I L See n M N O P Q R S T U V W Page Index Numerics A Page B C Page Page Page D E F G H I Page J L M Page N O P Page Page R Page Page Page S Page Page T U