Freescale Semiconductor MCF5480, MCF5481, MCF5482, MCF5483, MCF5484, MCF5485 16.2.3 Transfer Count Configuration RegisterDMA Read Channel (TCCRDR)

Memory Map/Register Definition

MCF548x Reference Manual, Rev. 3

Freescale Semiconductor 16-5

16.2.3 Transfer Count Configuration Register—DMA Read Channel

(TCCRDR)

This register is used to configure the allocated maximum transfer count for each bank for the DMA read

channel as it accesses SRAM directly, without going through the system bus.

Each field is described in the table below.

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

R0000 BANK3_TC 0 0 0 0 BANK2_TC

Reset0000111100001111

1514131211109876543210

R0000 BANK1_TC 0 0 0 0 BANK0_TC

Reset0000111100001111

Reg

Addr

MBAR + 0x1_FFC8

Figure 16-4. Transfer Count Configuration Register—DMA Read Channel (TCCRDR)

Table 16-4. TCCRDR Register Field Descriptions

Bits Name Description

31–28 — Reserved, should be cleared.

27–24 BANK3_TC Bank three transfer count. This field indicates the maximum transfer count for bank 3. The DMA

read channel can make at most 4 * {field value} 32-bit transfers from bank 3 before it must wait for

other masters to complete their transfers. If this field is programmed to “0” the DMA read channel

can “own” bank 3 for arbitrarily long transfers.

23–20 — Reserved, should be cleared.

19–16 BANK2_TC Bank two transfer count. This field indicates the maximum transfer count for bank 2. The DMA read

channel can make at most 4 * {field value} 32-bit transfers from bank 2 before it must wait for other

masters to complete their transfers. If this field is programmed to “0” the DMA read channel can

“own” bank 2 for arbitrarily long transfers.

15–12 — Reserved, should be cleared.

11–8 BANK1_TC Bank one transfer count. This field indicates the maximum transfer count for bank 1. The DMA read

channel can make at most 4 * {field value} 32-bit transfers from bank 1 before it must wait for other

masters to complete their transfers. If this field is programmed to “0” the DMA read channel can

“own” bank 1 for arbitrarily long transfers.

7–4 — Reserved, should be cleared.

3–0 BANK0_TC Bank zero transfer count. This field indicates the maximum transfer count for bank 0. The DMA read

channel can make at most 4 * {field value} 32-bit transfers from bank 0 before it must wait for other

masters to complete their transfers. If this field is programmed to “0” the DMA read channel can

“own” bank 0 for arbitrarily long transfers.

Contents

Main How to Reach Us: Page Page Chapter 1 Overview Chapter 2 Signal Descriptions Page Page Page Chapter 3 ColdFire Core Chapter 4 Enhanced Multiply-Accumulate Unit (EMAC) Chapter 5 Memory Management Unit (MMU) Chapter 6 Floating-Point Unit (FPU) Chapter 7 Local Memory Chapter 8 Debug Support Chapter 9 System Integration Unit (SIU) Chapter 10 Internal Clocks and Bus Architecture Chapter 11 General Purpose Timers (GPT) Chapter 12 Slice Timers (SLT) Chapter 13 Interrupt Controller Chapter 14 Edge Port Module (EPORT) Chapter 15 GPIO Chapter 16 32-Kbyte System SRAM Chapter 17 FlexBus Chapter 18 SDRAM Controller (SDRAMC) Page Chapter 19 PCI Bus Controller Page Chapter 20 PCI Bus Arbiter Module Chapter 21 FlexCAN Chapter 22 Integrated Security Engine (SEC) Page Chapter 23 IEEE 1149.1 Test Access Port (JTAG) Chapter 24 Multichannel DMA Page Chapter 25 Comm Timer Module (CTM) Chapter 26 Programmable Serial Controller (PSC) Page Page Chapter 27 DMA Serial Peripheral Interface (DSPI) Chapter 28 I2C Interface Chapter 29 USB 2.0 Device Controller Page Page Page Chapter 31 Mechanical Data Page About This Book Audience Organization Page Suggested Reading General Information ColdFire Documentation Conventions Register Conventions Acronyms and Abbreviations Table ii. . Acronyms and Abbreviated Terms (continued) Terminology and Notational Conventions Table iii shows notational conventions used throughout this document. Table iii. Notational Conventions Table ii. . Acronyms and Abbreviated Terms (continued) Table iii. Notational Conventions (continued) Table iv. MCF548x Revision History Table iii. Notational Conventions (continued) Page Page lii Freescale Semiconductor Section/Page Substantive Changes Page Table iv. MCF548x Revision History (continued) Page Page Page Page Chapter 1 Overview 1.1 MCF548x Family Overview 1.2 MCF548x Block Diagram Figure 1-1. MCF548x Block Diagram Figure 1-1 shows a top-level block diagram of the MCF548x products. 1.3 MCF548x Family Products 1.4 MCF548x Family Features Table 1-1. MCF548x Family Products Page 1.4.1 ColdFire V4e Core Overview 1.4.2 Debug Module (BDM) 1.4.3 JTAG 1.4.4 On-Chip Memories 1.4.4.1 Caches 1.4.4.2 System SRAM 1.4.5 PLL and Chip Clocking Options 1.4.6 Communications I/O Subsystem 1.4.6.1 DMA Controller 1.4.6.2 10/100 Fast Ethernet Controller (FEC) 1.4.6.3 USB 2.0 Device (Universal Serial Bus) 1.4.6.4 Programmable Serial Controllers (PSCs) 1.4.6.5 I2C (Inter-Integrated Circuit) 1.4.6.6 DMA Serial Peripheral Interface (DSPI) 1.4.6.7 Controller Area Network (CAN) 1.4.7 DDR SDRAM Memory Controller 1.4.8 Peripheral Component Interconnect (PCI) 1.4.9 Flexible Local Bus (FlexBus) 1.4.10 Security Encryption Controller (SEC) 1.4.11 System Integration Unit (SIU) 1.4.11.1 Timers 1.4.11.2 Interrupt Controller 1.4.11.3 General Purpose I/O Chapter 2 Signal Descriptions 2.1 Introduction 2.1.1 Block Diagram Figure 2-1. MCF548x Signals MCF548x 2-2 Freescale Semiconductor Table 2-1 lists the signals for the MCF548x in functional group order. Table 2-1. MCF548x Signal Description Page Page Page Page Page Page Table 2-2 lists the MCF548x signals in pin number order for the 388 PBGA package. Table 2-2. MCF5485/MCF5484 Signal Description by Pin Number Page Page Page Page Table 2-2. MCF5485/MCF5484 Signal Description by Pin Number (Continued) 2.2 MCF548x External Signals 2.2.1 FlexBus Signals 2.2.1.1 Address/Data Bus (AD[31:0]) 2.2.1.2 Chip Select (FBCS[5:0]) 2.2.1.3 Address Latch Enable (ALE) 2.2.1.4 Read/Write (R/W) 2.2.1.5 Transfer Burst (TBST) 2.2.1.6 Transfer Size (TSIZ[1:0]) 2.2.2 SDRAM Controller Signals 2.2.2.1 SDRAM Data Bus (SDDATA[31:0]) 2.2.2.2 SDRAM Address Bus (SDADDR[12:0]) Page 2.2.3 PCI Controller Signals 2.2.4 Interrupt Control Signals 2.2.5 Clock and Reset Signals 2.2.5.1 Reset In (RSTI) 2.2.5.2 Reset Out (RSTO) 2.2.5.3 Clock In (CLKIN) 2.2.6 Reset Configuration Pins 2.2.6.2 AD5FlexBus Size Configuration (FBSIZE) 2.2.6.3 AD432-bit FlexBus Configuration (FBMODE) 2.2.6.4 AD3Byte Enable Configuration (BECONFIG) 2.2.6.5 AD2Auto Acknowledge Configuration (AACONFIG) 2.2.6.6 AD[1:0]Port Size Configuration (PSCONFIG) 2.2.7 Ethernet Module Signals 2.2.7.1 Management Data (E0MDIO, E1MDIO) Page 2.2.8 Universal Serial Bus (USB) 2.2.9 DMA Serial Peripheral Interface (DSPI) Signals 2.2.10 FlexCAN Signals 2.2.11 I2C I/O Signals 2.2.12 PSC Module Signals 2.2.13 DMA Controller Module Signals 2.2.14 Timer Module Signals 2.2.14.1 Timer Inputs (TIN[3:0]) 2.2.14.2 Timer Outputs (TOUT[3:0]) 2.2.15 Debug Support Signals 2.2.15.1 Processor Clock Output (PSTCLK) 2.2.16 Test Signals 2.2.16.1 Test Mode (MTMOD[3:0]) 2.2.17 Power and Reference Pins Page Part I Processor Core Page Chapter 3 ColdFire Core 3.1 Core Overview 3.2 Features 3.2.1 Enhanced Pipelines Figure 3-1. ColdFire Enhanced Pipeline 3.2.1.1 Instruction Fetch Pipeline (IFP) 3.2.1.2 Operand Execution Pipeline (OEP) Page 3.2.1.3 Harvard Memory Architecture 3.2.2 Debug Module Enhancements 3.3 Programming Model Figure 3-3. ColdFire Programming Model 3.3.1 User Programming Model 3.3.1.1 Data Registers (D0D7) 3.3.1.2 Address Registers (A0A6) 3.3.2 User Stack Pointer (A7) 3.3.2.1 Program Counter (PC) 3.3.3 EMAC Programming Model 3.3.4 FPU Programming Model 3.3.5 Supervisor Programming Model 3.3.5.1 Status Register (SR) 3.3.5.2 Vector Base Register (VBR) 3.3.5.3 Cache Control Register (CACR) 3.3.5.4 Access Control Registers (ACR0ACR3) 3.3.5.5 RAM Base Address Registers (RAMBAR0 and RAMBAR1) 3.3.6 Programming Model Table Table 3-4. ColdFire CPU Registers 3.4 Data Format Summary 3.4.1 Data Organization in Registers 3.4.1.1 Integer Data Format Organization in Registers 3.4.1.2 Integer Data Format Organization in Memory 3.4.2 EMAC Data Representation += ()2 value 1 a 3.4.2.1 Floating-Point Data Formats and Types 3.5 Addressing Mode Summary 3.6 Instruction Set Summary 3.6.1 Additions to the Instruction Set Architecture Table 3-6. ColdFire Effective Addressing Modes Page Table 3-7. V4 New Instruction Summary (Continued) 3.6.2 Instruction Set Summary Table 3-8 lists user-mode instructions by opcode. Table 3-8. User-Mode Instruction Set Summary Table 3-7. V4 New Instruction Summary (Continued) Page Page Page Table 3-9 describes supervisor-mode instructions. 3.7 Instruction Execution Timing 3.7.1 MOVE Instruction Execution Timing Page 3.7.2 One-Operand Instruction Execution Timing Table 3-14 shows standard timings for single-operand instructions. Table 3-13. MAC and Miscellaneous Move Execution Times Table 3-14. One-Operand Instruction Execution Times 3.7.3 Two-Operand Instruction Execution Timing Table 3-15 shows standard timings for double operand instructions. Table 3-15. Two-Operand Instruction Execution Times 3.7.4 Miscellaneous Instruction Execution Timing Table 3-16 lists timings for miscellaneous instructions. Table 3-16. Miscellaneous Instruction Execution Times Table 3-15. Two-Operand Instruction Execution Times (Continued) 3.7.5 Branch Instruction Execution Timing Table 3-17 shows general branch instruction timing. Table 3-17. General Branch Instruction Execution Times Table 3-16. Miscellaneous Instruction Execution Times (Continued) Table 3-18 shows timing for Bcc instructions. 3.7.6 EMAC Instruction Execution Times Table 3-18. Bcc Instruction Execution Times Table 3-19. EMAC Instruction Execution Times 3.7.7 FPU Instruction Execution Times Table 3-20 specifies the instruction execution times associated with the FPU execute engine. Table 3-20. FPU Instruction Execution Times1, 2 Table 3-19. EMAC Instruction Execution Times 3.8 Exception Processing Overview Page 3.8.1 Exception Stack Frame Definition 3.8.2 Processor Exceptions Table 3-22. Format/Vector Word Table 3-23. Processor Exceptions Table 3-23. Processor Exceptions (Continued) 3.9 Precise Faults Page Page Chapter 4 Enhanced Multiply-Accumulate Unit (EMAC) 4.1 Introduction 4.1.1 MAC Overview 4.1.2 General Operation yi() a Page Page 4.2 Memory Map/Register Definition 4.2.1 MAC Status Register (MACSR) Table 4-1 describes MACSR fields. Figure 4-7. MAC Status Register (MACSR) Table 4-1. MACSR Field Descriptions Table 4-2 summarizes the interaction of the MACSR[S/U,F/I,R/T] control bits. Table 4-1. MACSR Field Descriptions (Continued) 4.2.1.1 Fractional Operation Mode Page 4.2.2 Mask Register (MASK) 4.3 EMAC Instruction Set Summary 4.3.1 EMAC Instruction Execution Timing 4.3.2 Data Representation += ()2 value 1 a ai 4.3.3 EMAC Opcodes Page Page Page Page Page Chapter 5 Memory Management Unit (MMU) 5.1 Features 5.2 Virtual Memory Management Architecture 5.2.1 MMU Architecture Features 5.2.2 MMU Architecture Location Figure 5-1. CF4e Processor Core Block with MMU 5.2.3 MMU Architecture Implementation 5.2.3.1 Precise Faults 5.2.3.2 MMU Access 5.2.3.3 Virtual Mode 5.2.3.4 Virtual Memory References 5.2.3.5 Instruction and Data Cache Addresses 5.2.3.6 Supervisor/User Stack Pointers 5.2.3.7 Access Error Stack Frame 5.2.3.8 Expanded Control Register Space 5.2.3.9 Changes to ACRs and CACR 5.2.3.10 ACR Address Improvements Table 5-1. New ACR and CACR Bits 5.2.3.11 Supervisor Protection 5.3 Debugging in a Virtual Environment 5.4 Virtual Memory Architecture Processor Support 5.4.1 Precise Faults 5.4.2 Supervisor/User Stack Pointers 5.4.3 Access Error Stack Frame Additions 5.5 MMU Definition 5.5.1 Effective Address Attribute Determination 5.5.2 MMU Functionality 5.5.3 MMU Organization 5.5.3.1 MMU Base Address Register (MMUBAR) 5.5.3.2 MMU Memory Map 5.5.3.3 MMU Control Register (MMUCR) Table 5-5 describes MMUCR fields. 5.5.3.4 MMU Operation Register (MMUOR) Figure 5-5 shows the MMUOR. Figure 5-4. MMU Control Register (MMUCR) Table 5-5. MMUCR Field Descriptions Table 5-6 describes MMUOR fields. Figure 5-5. MMU Operation Register (MMUOR) Table 5-6. MMUOR Field Descriptions 5.5.3.5 MMU Status Register (MMUSR) MMUSR, Figure 5-6, is updated on all data access faults and search TLB operations. Figure 5-6. MMU Status Register (MMUSR) Table 5-7 describes MMUSR fields. Table 5-6. MMUOR Field Descriptions (Continued) 5.5.3.6 MMU Fault, Test, or TLB Address Register (MMUAR) The MMUAR format, Figure 5-7, depends on how the register is used. Figure 5-7. MMU Fault, Test, or TLB Address Register (MMUAR) Table 5-8 describes MMUAR fields. Table 5-7. MMUSR Field Descriptions 5.5.3.7 MMU Read/Write Tag and Data Entry Registers (MMUTR and MMUDR) Table 5-10 describes MMUDR fields. Figure 5-9. MMU Read/Write TLB Data Register (MMUDR) Table 5-10. MMUDR Field Descriptions Table 5-9. MMUTR Field Descriptions (Continued) 5.5.4 MMU TLB Table 5-10. MMUDR Field Descriptions (Continued) 5.5.5 MMU Operation 5.6 MMU Implementation 5.6.1 TLB Address Fields 5.6.2 TLB Replacement Algorithm 5.6.3 TLB Locked Entries Figure 5-11. Version 4 ColdFire MMU Harvard TLB 5.7 MMU Instructions Page Chapter 6 Floating-Point Unit (FPU) 6.1 Introduction 6.1.1 Overview 6.1.1.1 Notational Conventions Table 6-2 describes addressing modes and syntax for floating-point instructions. Table 6-1. Notational Conventions (Continued) 6.2 Operand Data Formats and Types 6.2.1 Signed-Integer Data Formats 6.2.2 Floating-Point Data Formats 6.2.3 Floating-Point Data Types 6.2.3.1 Normalized Numbers 6.2.3.2 Zeros 6.2.3.3 Infinities 6.2.3.4 Not-A-Number 6.2.3.5 Denormalized Numbers Table 6-3. Real Format Summary (Continued) 6.3 Register Definition 6.3.1 Floating-Point Data Registers (FP0FP7) 6.3.2 Floating-Point Control Register (FPCR) Table 6-4 describes FPCR fields. Figure 6-9. Floating-Point Control Register (FPCR) Table 6-4. FPCR Field Descriptions 6.3.3 Floating-Point Status Register (FPSR) 6.3.4 Floating-Point Instruction Address Register (FPIAR) 6.4 Floating-Point Computational Accuracy 6.4.1 Intermediate Result 6.4.2 Rounding the Result Freescale Semiconductor 6-13 Figure 6-12. Rounding Algorithm Flowchart 6.5 Floating-Point Post-Processing 6.5.1 Underflow, Round, and Overflow 6.5.2 Conditional Testing Page 6.6 Floating-Point Exceptions Table 6-9. Floating-Point Conditional Tests (Continued) 6.6.1 Floating-Point Arithmetic Exceptions 6.6.1.1 Branch/Set on Unordered (BSUN) 6.6.1.2 Input Not-A-Number (INAN) 6.6.1.3 Input Denormalized Number (IDE) 6.6.1.4 Operand Error (OPERR) 6.6.1.5 Overflow (OVFL) 6.6.1.6 Underflow (UNFL) 6.6.1.7 Divide-by-Zero (DZ) 6.6.1.8 Inexact Result (INEX) 6.6.2 Floating-Point State Frames Page 6.7 Instructions 6.7.1 Floating-Point Instruction Overview Table 6-24 defines the terminology used in Table 6-23. Table 6-24. Instruction Format Terminology Table 6-23. Floating-Point Instruction Formats (Continued) 6.7.2 Floating-Point Instruction Execution Timing 6.7.3 Key Differences between ColdFire and M68000 FPU Programming Models Page Page Chapter 7 Local Memory 7.1 Interactions between Local Memory Modules 7.2 SRAM Overview 7.3 SRAM Operation 7.4 SRAM Register Definition 7.4.1 SRAM Base Address Registers (RAMBAR0/RAMBAR1) RAMBARn fields are described in detail in Table 7-1. Figure 7-1. SRAM Base Address Registers (RAMBARn) Table 7-1. RAMBARn Field Description 7.5 SRAM Initialization 7.5.1 SRAM Initialization Code 7.6 Power Management 7.7 Cache Overview 7.8 Cache Organization 7.8.1 Cache Line States: Invalid, Valid-Unmodified, and Valid-Modified 7.8.2 The Cache at Start-Up Figure 7-4. Data CacheA: at Reset, B: after Invalidation, C and D: Loading Pattern 7.9 Cache Operation Page 7.9.1 Caching Modes 7.9.1.1 Cacheable Accesses 7.9.1.2 Cache-Inhibited Accesses 7.9.2 Cache Protocol 7.9.2.1 Read Miss 7.9.2.2 Write Miss (Data Cache Only) 7.9.2.3 Read Hit 7.9.2.4 Write Hit (Data Cache Only) 7.9.3 Cache Coherency (Data Cache Only) 7.9.4 Memory Accesses for Cache Maintenance 7.9.4.1 Cache Filling 7.9.4.2 Cache Pushes 7.9.5 Cache Locking Figure 7-7. Data Cache Locking 7.10 Cache Register Definition 7.10.1 Cache Control Register (CACR) Page Table 7-4. CACR Field Descriptions (Continued) 7.10.2 Access Control Registers (ACR0ACR3) 7.11 Cache Management Page Page 7.12 Cache Operation Summary 7.12.1 Instruction Cache State Transitions Figure 7-12. Instruction Cache Line State Diagram Table 7-6 describes the instruction cache state transitions shown in Figure 7-12. Table 7-6. Instruction Cache Line State Transitions 7.12.2 Data Cache State Transitions Table 7-7. Data Cache Line State Transitions In Table 7-9 the current state is valid. Table 7-8. Data Cache Line State Transitions (Current State Invalid) Table 7-9. Data Cache Line State Transitions (Current State Valid) In Table 7-10 the current state is modified. 7.13 Cache Initialization Code The following example sets up the cache for FLASH or ROM space only. Table 7-10. Data Cache Line State Transitions (Current State Modified) Chapter 8 Debug Support 8.1 Introduction 8.1.1 Overview 8.2 Signal Descriptions 8.2.1 Processor Status/Debug Data (PSTDDATA[7:0]) Page 8.3 Real-Time Trace Support 8.3.1 Begin Execution of Taken Branch (PST = 0x5) Table 8-4. Processor Status Encoding (Continued) 8.3.2 Processor Stopped or Breakpoint State Change (PST = 0xE) 8.3.3 Processor Halted (PST = 0xF) 8.4 Memory Map/Register Definition Figure 8-5. Debug Programming Model Table 8-6. BDM/Breakpoint Registers 8.4.1 Revision A Shared Debug Resources 8.4.2 Configuration/Status Register (CSR) Table 8-8 describes CSR fields. Figure 8-6. Configuration/Status Register (CSR) Table 8-8. CSR Field Descriptions Table 8-8. CSR Field Descriptions (Continued) 8.4.3 PC Breakpoint ASID Control Register (PBAC) Figure 8-7. PC Breakpoint ASID Control Register (PBAC) Table 8-8. CSR Field Descriptions (Continued) 8.4.4 BDM Address Attribute Register (BAAR) 8.4.5 Address Attribute Trigger Registers (AATR, AATR1) Table 8-11 describes AATR and AATR1 fields. Table 8-10. BAAR Field Descriptions 8.4.6 Trigger Definition Register (TDR) Table 8-11. AATR and AATR1 Field Descriptions (Continued) Table 8-12 describes TDR fields. Figure 8-10. Trigger Definition Register (TDR) Table 8-12. TDR Field Descriptions Table 8-12. TDR Field Descriptions (Continued) 8.4.7 Program Counter Breakpoint and Mask Registers (PBRn, PBMR) 8.4.8 Address Breakpoint Registers (ABLR/ABLR1, ABHR/ABHR1) Table 8-15 describes ABLR and ABLR1 fields. Table 8-16 describes ABHR and ABHR1 fields. 8.4.9 Data Breakpoint and Mask Registers (DBR/DBR1, DBMR/DBMR1) Table 8-16. ABHR and ABHR1 Field Description Table 8-17 describes DBRn fields. Table 8-18 describes DBMRn fields. Figure 8-14. Data Breakpoint Registers (DBR/DBR1) Table 8-17. DBRn Field Descriptions Figure 8-15. Data Breakpoint Mask Registers (DBMR/DBMR1) Table 8-18. DBMRn Field Descriptions 8.4.10 PC Breakpoint ASID Register (PBASID) 8.4.11 Extended Trigger Definition Register (XTDR) Table 8-21 describes XTDR fields. Table 8-21. XTDR Field Descriptions 8.4.11.1 Resulting Set of Possible Trigger Combinations Table 8-21. XTDR Field Descriptions (Continued) 8.5 Background Debug Mode (BDM) 8.5.1 CPU Halt Page 8.5.2 BDM Serial Interface 8.5.2.1 Receive Packet Format Table 8-22 describes receive BDM packet fields. 8.5.2.2 Transmit Packet Format The basic transmit packet, Figure 8-20, consists of 16 data bits and 1 control bit. 8.5.3 BDM Command Set Figure 8-19. Receive BDM Packet Table 8-22. Receive BDM Packet Field Description Figure 8-20. Transmit BDM Packet Table 8-23. Transmit BDM Packet Field Description Table 8-24. BDM Command Summary 8.5.3.1 ColdFire BDM Command Format 8.5.3.2 Command Sequence Diagrams Page 8.5.3.3 Command Set Descriptions Page Command Sequence: Figure 8-28. READ Command Sequence Operand Data The only operand is the longword address of the requested location. Figure 8-27. Page Page 8-40 Freescale Semiconductor DUMP does not check for a valid address; it is a valid command only when Command Sequence: Operand Data: None Figure 8-32. DUMP Command Sequence Figure 8-31. DUMP Command/Result Formats Page Page Page Page Page Table 8-26. ColdFire CPU Control Register Map Page Page Page Page 8.6 Real-Time Debug Support 8.6.1 Theory of Operation Page 8.6.1.1 Emulator Mode 8.6.2 Concurrent BDM and Processor Operation 8.7 Debug C Definition of PSTDDATA Outputs 8.7.1 User Instruction Set Page Page Page Table 8-31 shows the PSTDDATA specification for multiply-accumulate instructions. Table 8-31. PSTDDATA Values for User-Mode Multiply-Accumulate Instructions Table 8-32. PSTDDATA Values for User-Mode Floating-Point Instructions Table 8-31. PSTDDATA Values for User-Mode Multiply-Accumulate Instructions (Continued) 8.7.2 Supervisor Instruction Set Table 8-33. Data Markers and FPU Operand Format Specifiers Table 8-34. PSTDDATA Specification for Supervisor-Mode Instructions Table 8-32. PSTDDATA Values for User-Mode Floating-Point Instructions (Continued) 8.8 ColdFire Debug History 8.8.1 ColdFire Debug Classic: The Original Definition 8.8.2 ColdFire Debug Revision B 8.8.3 ColdFire Debug Revision C 8.8.3.1 Debug Interrupts and Interrupt Requests (Emulator Mode) 8.9 Freescale-Recommended BDM Pinout Figure 8-51. Recommended BDM Connector Part II System Integration Unit Page Chapter 9 System Integration Unit (SIU) 9.1 Introduction 9.2 Features 9.3 Memory Map/Register Definition 9.3.1 Module Base Address Register (MBAR) 9.3.1.1 System Breakpoint Control Register (SBCR) Figure 9-1. Module Base Address Register (MBAR) Figure 9-2. System Breakpoint Control Register (SBCR) Table 9-2. SBCR Field Descriptions 9.3.1.2 SEC Sequential Access Control Register (SECSACR) Figure 9-3. SEC Sequential Access Control Register (SECSACR) Table 9-3. SECSACR Field Descriptions Table 9-2. SBCR Field Descriptions (Continued) 9.3.1.3 Reset Status Register (RSR) Figure 9-5. JTAG Device ID Register (JTAGID) 9.3.1.4 JTAG Device Identification Number (JTAGID) Figure 9-4. Reset Status Register (RSR) Table 9-4. RSR Field Descriptions Table 9-5. JTAGID Field Descriptions Chapter 10 Internal Clocks and Bus Architecture 10.1 Introduction Figure 10-1. MCF548x Internal Bus Architecture 10.1.1 Block Diagram Figure 10-1 shows a top-level block diagram of the MCF548x products. 10.1.2 Clocking Overview 10.1.3 Internal Bus Overview 10.1.4 XL Bus Features 10.1.5 Internal Bus Transaction Summaries 10.1.6 XL Bus Interface Operations 10.1.6.1 Basic Transfer Protocol 10.1.6.2 Address Pipelines 10.2 PLL 10.2.1 PLL Memory Map/Register Descriptions 10.2.2 System PLL Control Register (SPCR) Table 10-2. System PLL Memory Map Figure 10-4. System PLL Control Register (SPCR) Table 10-3. SPCR Field Descriptions 10.3 XL Bus Arbiter 10.3.1 Features 10.3.2 Arbiter Functional Description 10.3.2.1 Prioritization 10.3.2.2 Bus Grant Mechanism 10.3.2.3 Watchdog Functions 10.3.3 XLB Arbiter Register Descriptions 10.3.3.1 Arbiter Configuration Register (XARB_CFG) Figure 10-5. Arbiter Configuration Register (XARB_CFG) Table 10-5. XARB_CFG Bit Descriptions Table 10-4. XL Bus Arbiter Memory Map (Continued) 10.3.3.2 Arbiter Version Register (XARB_VER) Figure 10-6. Arbiter Version Register (XARB_VER) Table 10-6. VER Field Descriptions Table 10-5. XARB_CFG Bit Descriptions (Continued) 10.3.3.3 Arbiter Status Register (XARB_SR) 10.3.3.4 Arbiter Interrupt Mask Register (XARB_IMR) Figure 10-7. Arbiter Status Register (XARB_SR) Table 10-7. XARB_SR Field Descriptions Figure 10-8. Arbiter Interrupt Mask Register (XARB_IMR) Table 10-8. XARB_IMR Field Descriptions 10.3.3.5 Arbiter Address Capture Register (XARB_ADRCAP) 10.3.3.6 Arbiter Bus Signal Capture Register (XARB_SIGCAP) 10.3.3.7 Arbiter Address Tenure Time Out Register (XARB_ADRTO) Figure 10-11. Arbiter Address Tenure Time Out Register (XARB_ADRTO) 10.3.3.8 Arbiter Data Tenure Time Out Register (XARB_DATTO) Table 10-11. XARB_ADRTO Field Descriptions 10.3.3.9 Arbiter Bus Activity Time Out Register (XARB_BUSTO) 10.3.3.10 Arbiter Master Priority Enable Register (XARB_PRIEN) Figure 10-14. Arbiter Master Priority Enable Register (XARB_PRIEN) 10.3.3.11 Arbiter Master Priority Register (XARB_PRI) Table 10-16. XARB_PRI Field Descriptions Chapter 11 General Purpose Timers (GPT) 11.1 Introduction 11.1.1 Overview 11.1.2 Modes of Operation 11.2 External Signals 11.3 Memory Map/Register Definition 11.3.1 GPT Enable and Mode Select Register (GMSn) Figure 11-1. GPT Enable and Mode Select Register (GMSn) Table 11-2. GMSn Field Descriptions Table 11-2. GMSn Field Descriptions (Continued) 11.3.2 GPT Counter Input Register (GCIRn) Figure 11-2. GPT Counter Input Register (GCIRn) Table 11-2. GMSn Field Descriptions (Continued) 11.3.3 GPT PWM Configuration Register (GPWMn) Table 11-3. GCIRn Field Descriptions Figure 11-3. GPT PWM Configuration Register (GPWMn) Table 11-4. GPWMn Field Descriptions 11.3.4 GPT Status Register (GSRn) Figure 11-4. GPT Status Register (GSRn) Table 11-5. GSRn Field Descriptions Table 11-4. GPWMn Field Descriptions (Continued) 11.4 Functional Description 11.4.1 Timer Configuration Method 11.4.2 Programming Notes Chapter 12 Slice Timers (SLT) 12.1 Introduction 12.1.1 Overview 12.2 Memory Map/Register Definition 12.2.1 SLT Terminal Count Register (STCNTn) 12.2.2 SLT Control Register (SCRn) Figure 12-2. SLT Control Register (SCRn) Figure 12-1. SLT Terminal Count Register (STCNTn) Table 12-2. STCNTn Field Descriptions 12.2.3 SLT Timer Count Register (SCNTn) Table 12-3. SCRn Field Descriptions Figure 12-3. SLT Count Register (SCNTn) Table 12-4. SCNTn Field Descriptions 12.2.4 SLT Status Register (SSRn) Figure 12-4. SLT Status Register (SSRn) Table 12-5. SSRn Field Descriptions Chapter 13 Interrupt Controller 13.1 Introduction 13.1.1 68K/ColdFire Interrupt Architecture Overview 13.1.1.1 Interrupt Controller Theory of Operation Page 13.2 Memory Map/Register Descriptions 13.2.1 Register Descriptions 13.2.1.1 Interrupt Pending Registers (IPRH, IPRL) Table 13-2. Interrupt Controller Memory Map (Continued) Figure 13-1. Interrupt Pending Register High (IPRH) Table 13-3. IPRH Field Descriptions Figure 13-2. Interrupt Pending Register Low (IPRL) 13.2.1.2 Interrupt Mask Register (IMRH, IMRL) 13.2.1.3 Interrupt Force Registers (INTFRCH, INTFRCL) Table 13-5. IMRH Field Descriptions Figure 13-4. Interrupt Mask Register Low (IMRL) Table 13-6. IMRL Field Descriptions Figure 13-5. Interrupt Force Register High (INTFRCH) Table 13-7. INTFRCH Field Descriptions Figure 13-6. Interrupt Force Register Low (INTFRCL) Table 13-8. INTFRCL Field Descriptions 13.2.1.4 Interrupt Request Level Register (IRLR) 13.2.1.5 Interrupt Acknowledge Level and Priority Register (IACKLPR) 13.2.1.6 Interrupt Control Registers 163 (ICRn) Figure 13-9. Interrupt Control Registers 163 (ICRn) Table 13-11. ICRn Field Descriptions Table 13-10. IACKLPR Field Descriptions (Continued) 13.2.1.6.1 Interrupt Sources Table 13-12 lists the interrupt sources for each interrupt request line Table 13-12. Interrupt Source Assignments 13.2.1.7 Software and Level n IACK Registers (SWIACKR, L1IACKL7IACK) Table 13-12. Interrupt Source Assignments (Continued) Page Chapter 14 Edge Port Module (EPORT) 14.1 Introduction 14.2 Interrupt/General-Purpose I/O Pin Descriptions 14.3 Memory Map/Register Definition 14.3.1 Memory Map 14.3.2 Register Descriptions 14.3.2.1 EPORT Pin Assignment Register (EPPAR) 14.3.2.2 EPORT Data Direction Register (EPDDR) Figure 14-3. EPORT Data Direction Register (EPDDR) Figure 14-2. EPORT Pin Assignment Register (EPPAR) Table 14-2. EPPAR Field Descriptions 14.3.2.3 Edge Port Interrupt Enable Register (EPIER) 14.3.2.4 Edge Port Data Register (EPDR) Figure 14-5. EPORT Port Data Register (EPDR) Table 14-3. EPDDR Field Descriptions Figure 14-4. EPORT Port Interrupt Enable Register (EPIER) Table 14-4. EPIER Field Descriptions 14.3.2.5 Edge Port Pin Data Register (EPPDR) 14.3.2.6 Edge Port Flag Register (EPFR) Figure 14-7. EPORT Port Flag Register (EPFR) Table 14-5. EPDR Field Descriptions Figure 14-6. EPORT Port Pin Data Register (EPPDR) Table 14-6. EPPDR Field Descriptions Table 14-7. EPFR Field Descriptions Chapter 15 GPIO 15.1 Introduction Figure 15-1. MCF548x GPIO Module Block Diagram 15.1.1 Overview 15.1.2 Features 15.2 External Pin Description Page SDA PFECI2C1 SCL PFECI2C0 Primary Function (Pin Name)1GPIO Alternate Alternate Page 15.3 Memory Map/Register Definition Table 15-3 summarizes all the registers in the MCF548x GPIO module address space. 15.3.1 Register Overview Table 15-2. MCF548x Multiple-Pin Functions Table 15-3. MCF548x GPIO Module Memory Map 15.3.2 Register Descriptions 15.3.2.1 Port x Output Data Registers (PODR_x) Table 15-3. MCF548x GPIO Module Memory Map (Continued) Page Figure 15-3. 7-Bit PODR_DSPI Register (PODR_x) Table 15-5. 7-Bit PODR_DSPI Field Descriptions 15.3.2.2 Port x Data Direction Registers (PDDR_x) Figure 15-6. 5-Bit PODR_FBCS Register Table 15-8. 5-Bit PODR_FBCS Field Descriptions Page Page 15.3.2.3 Port x Pin Data/Set Data Registers (PPDSDR_x) Figure 15-11. 5-Bit PDDR_FBCS Register Table 15-13. 5-Bit PDDR_FBCS Field Descriptions Page Page Table 15-16. 5-Bit PPDSDR_PCIBG and PPDSDR_PCIBR Field Descriptions (Continued) 15.3.2.4 Port x Clear Output Data Registers (PCLRR_x) Figure 15-17. 8-Bit Port Clear Output Data Registers Table 15-19. 8-Bit PCLRR_x Field Descriptions Page 15.3.2.5 Port x Pin Assignment Registers (PAR_x) 15.3.2.6 FlexBus Chip Select Pin Assignment Register (PAR_FBCS) Figure 15-23. Flexbus Chip Select Pin Assignment Register (PAR_FBCS) Table 15-24. PAR_FBCTL Field Descriptions (Continued) 15.3.2.7 DMA Pin Assignment Register (PAR_DMA) 15.3.2.8 FEC/I2C/IRQ Pin Assignment Register (PAR_FECI2CIRQ) Table 15-25. PAR_FBCS Field Descriptions Figure 15-24. DMA Pin Assignment Register (PAR_DMA) Table 15-26. PAR_DMA Field Descriptions Page 15.3.2.9 PCI Grant Pin Assignment Register (PAR_PCIBG) Table 15-27. PAR_FEC/I2C/IRQ Field Descriptions (Continued) 15.3.2.10 PCI Request Pin Assignment Register (PAR_PCIBR) The PAR_PCIBR controls the functions of the PCI request pins. The PAR_PCIBR is read/write. Table 15-28. PAR_PCIBG Field Descriptions (Continued) 15.3.2.11 PSC3 Pin Assignment Register (PAR_PSC3) The PAR_PSC3 register controls the functions of the PSC3 pins. The PAR_PSC3 register is read/write. Figure 15-28. PSC3 Pin Assignment Register (PAR_PCS3) Table 15-30. PAR_PSC3 Descriptions Table 15-29. PAR_PCIBR Field Descriptions (Continued) 15.3.2.12 PSC2 Pin Assignment Register (PAR_PSC2) The PAR_PSC2 register controls the functions of the PSC2 pins. The PAR_PSC2 register is read/write. The PAR_PSC1 register controls the functions of the PSC1 pins. The PAR_PSC1 register is read/write. 15.3.2.13 PSC1 Pin Assignment Register (PAR_PSC1) Figure 15-29. PSC2 Pin Assignment Register (PAR_PSC2) Table 15-31. PAR_PSC2 Descriptions 15.3.2.14 PSC0 Pin Assignment Register (PAR_PSC0) The PAR_PSC0 register controls the functions of the PSC0 pins. The PAR_PSC0 register is read/write. Figure 15-31. PSC0 Pin Assignment Register (PAR_PSC0) Figure 15-30. PSC1 Pin Assignment Register (PAR_PSC1) Table 15-32. PAR_PCS1 Descriptions 15.3.2.15 DSPI Pin Assignment Register (PAR_DSPI) Table 15-33. PAR_PCS0 Descriptions Figure 15-32. DSPI Pin Assignment Register (PAR_DSPI) Table 15-34. PAR_DSPI Descriptions 15.3.2.16 General Purpose Timer Pin Assignment Register (PAR_TIMER) Figure 15-33. General Purpose Timer Pin Assignment Register (PAR_TIMER) Table 15-34. PAR_DSPI Descriptions (Continued) 15.4 Functional Description 15.4.1 Overview Page Page Part III On-Chip Integration Page Chapter 16 32-Kbyte System SRAM 16.1 Introduction Long Word 8191 Figure 16-1. SRAM Organization This chapter explains the operation of the MCF548x 32-Kbyte system SRAM. 16.2 Memory Map/Register Definition 16.2.1 System SRAM Configuration Register (SSCR) Each field is described in Table 16-2. Figure 16-2. System SRAM Configuration Register (SSCR) Table 16-2. SSCR Register Field Descriptions Table 16-1. System SRAM Memory Map (Continued) 16.2.2 Transfer Count Configuration Register (TCCR) Each field is described in the Table 16-3. 16.2.3 Transfer Count Configuration RegisterDMA Read Channel (TCCRDR) 16.2.4 Transfer Count Configuration RegisterDMA Write Channel (TCCRDW) 16.2.5 Transfer Count Configuration RegisterSEC (TCCRSEC) 16.3 Functional Description Chapter 17 FlexBus 17.1 Introduction 17.1.1 Overview 17.1.2 Features 17.1.3 Modes of Operation 17.2 Byte Lanes 17.3 Address Latch Figure 17-2. Multiplexed FlexBus Implementation 17.4 External Signals Table 17-1. FlexBus Signal Summary 17.4.1 Chip-Select (FBCS[5:0]) 17.4.2 Address/Data Bus (AD[31:0]) 17.4.3 Address Latch Enable (ALE) 17.4.4 Read/Write (R/W) 17.4.5 Transfer Burst (TBST) 17.4.7 Byte Selects (BE/BWE[3:0]) 17.4.8 Output Enable (OE) 17.4.9 Transfer Acknowledge (TA) 17.5 Chip-Select Operation 17.5.1 General Chip-Select Operation 17.5.1.1 8-, 16-, and 32-Bit Port Sizing 17.5.1.2 Global Chip-Select Operation 17.5.2 Chip-Select Registers Table 17-4. AD[2]/AA Automatic Acknowledge of Boot FBCS0 Table 17-5. AD[1:0]/PS[1:0], Port Size of Boot FBCS0 Table 17-6. Chip-Select Registers 17.5.2.1 Chip-Select Address Registers (CSAR0CSAR5) CSARn, Figure 17-3, specify the chip-select base addresses. Figure 17-3. Chip-Select Address Registers (CSARn) Table 17-7. CSARn Field Descriptions Table 17-6. Chip-Select Registers (Continued) 17.5.2.2 Chip-Select Mask Registers (CSMR0CSMR5) Table 17-8 describes CSMR fields. Figure 17-4. Chip-Select Mask Registers (CSMRn) Table 17-8. CSMRn Field Descriptions 17.5.2.3 Chip-Select Control Registers (CSCR0CSCR5) Table 17-9 describes CSCRn fields. Figure 17-5. Chip-Select Control Registers (CSCRn) Table 17-9. CSCRn Field Descriptions Table 17-9. CSCRn Field Descriptions (Continued) 17.6 Functional Description 17.6.1 Data Transfer Operation 17.6.2 Data Byte Alignment and Physical Connections 17.6.3 Address/Data Bus Multiplexing 17.6.4 Bus Cycle Execution 17.6.4.1 Data Transfer Cycle States Figure 17-7. Data Transfer State Transition Diagram Table 17-11 describes the states as they appear in subsequent timing diagrams. Table 17-11. Bus Cycle States 17.6.5 FlexBus Timing Examples 17.6.5.1 Basic Read Bus Cycle Figure 17-9. Basic Read Bus Cycle 17.6.5.2 Basic Write Bus Cycle Figure 17-10. Write Cycle Flowchart 17.6.5.3 Bus Cycle Multiplexing Figure 17-12. Single Word Read Transfer with Muxed 32-A / 16-D or Non-Muxed 16-A / 16-D Figure 17-13. Single Word Write Transfer with Muxed 32-A / 16-D or Non-Muxed 16-A / 16-D Page Figure 17-15. Single Byte Write Transfer with Muxed 32-A / 8-D or Non-Muxed 24-A / 8-D Figure 17-16. Longword Read Transfer with Muxed 32-A / 32-D 17.6.5.4 Timing Variations Figure 17-18. Basic Read Bus Cycle (No Wait States) Figure 17-19. Basic Write Bus Cycle (No Wait States) Figure 17-20. Read Bus Cycle (One Wait State) Figure 17-21. Write Bus Cycle (One Wait State) Figure 17-22. Read Bus Cycle with Two Clock Address Setup (No Wait States) Figure 17-23. Write Bus Cycle with Two Clock Address Setup (No Wait States) Figure 17-24. Read Cycle with Two Clock Address Hold (No Wait States) Figure 17-26 shows a bus cycle that uses address setup, wait states, and address hold. Figure 17-25. Write Cycle with Two Clock Address Hold (No Wait States) 17.6.6 Burst Cycles Page Figure 17-28. Longword Write Burst to 8-Bit Port 3-1-1-1 (No Wait States) Figure 17-29. Longword Read Burst-Inhibited from 8-Bit Port (No Wait States) Figure 17-30. Longword Write Burst-Inhibited to 8-Bit Port (No Wait States) Figure 17-31. Longword Read Burst from 8-Bit Port 4-2-2-2 (One Wait State) Figure 17-31 illustrates a write burst transfer with one wait state. Figure 17-32. Longword Write Burst to 8-Bit Port 4-2-2-2 (One Wait State) Figure 17-34 shows a write cycle with one clock of address setup and address hold. Figure 17-33. Longword Read Burst from 8-Bit Port 4-1-1-1 (Address Setup and Hold) 17.6.7 Misaligned Operands 17.6.8 Bus Errors Chapter 18 SDRAM Controller (SDRAMC) 18.1 Introduction 18.2 Overview 18.2.1 Features 18.2.2 Terminology 18.3 External Signal Description 18.3.1 SDRAM Data Bus (SDDATA[31:0]) 18.3.2 SDRAM Address Bus (SDADDR[12:0]) 18.3.3 SDRAM Bank Addresses (SDBA[1:0]) Page 18.3.12 SDRAM Clock Enable (SDCKE) 18.3.13 SDR SDRAM Data Strobe (SDRDQS) 18.3.14 SDRAM Memory Supply (SDVDD) 18.3.15 SDRAM Reference Voltage (VREF) 18.4 Interface Recommendations 18.4.1 Supported Memory Configurations Table 18-2. SDRAM Address Multiplexing 18.4.2 SDRAM SDR Connections 18.4.3 SDRAM DDR Component Connections Figure 18-3. MCF548x Connections to DDR SDRAM 18.4.4 SDRAM DDR DIMM Connections 18.4.5 DDR SDRAM Layout Considerations 18.4.5.1 Termination Example Figure 18-5 shows the recommended termination circuitry for DDR SDRAM signals. Figure 18-5. MCF548x DDR SDRAM Termination Circuit 18.5 SDRAM Overview 18.5.1 SDRAM Commands Table 18-3. SDRAM Commands 18.5.1.1 Row and Bank Active Command (ACTV) 18.5.1.2 Read Command (READ) 18.5.1.3 Write Command (WRITE) 18.5.1.4 Precharge All Banks Command (PALL) 18.5.1.5 Load Mode/Extended Mode Register Command (LMR, LEMR) Page 18.5.1.6 Auto Refresh Command (REF) 18.5.1.7 Self-Refresh (SREF) and Power-Down (PDWN) Commands 18.5.2 Power-Up Initialization 18.5.2.1 SDR Initialization 18.5.2.2 DDR Initialization 18.6 Functional Overview 18.6.1 Page Management 18.6.2 Transfer Size 18.7 Memory Map/Register Definition 18.7.1 SDRAM Drive Strength Register (SDRAMDS) Figure 18-8. SDRAM Drive Strength Register (SDRAMDS) Table 18-7. SDRAMDS Field Descriptions Table 18-8. SDRAM Drive Strength Bit Encodings 18.7.2 SDRAM Chip Select Configuration Registers (CSnCFG) 18.7.3 SDRAM Mode/Extended Mode Register (SDMR) 18.7.4 SDRAM Control Register (SDCR) Figure 18-11. SDRAM Control Register (SDCR) Table 18-11. SDCR Field Descriptions 18.7.5 SDRAM Configuration Register 1 (SDCFG1) Table 18-11. SDCR Field Descriptions (Continued) Figure 18-12. SDRAM Configuration Register 1 (SDCFG1) Table 18-12. SDCFG1 Field Descriptions 18.7.6 SDRAM Configuration Register 2 (SDCFG2) Table 18-12. SDCFG1 Field Descriptions (Continued) 18.8 SDRAM Example Figure 18-13. SDRAM Configuration Register 2 (SDCFG2) Table 18-13. SDCFG2 Field Descriptions Table 18-14. SDRAM Example Specifications 18.8.1 SDRAM Signal Drive Strength Settings This configuration results in a value of SDRAMDS = 0x0000_02AA, as described in Table 18-15. 18.8.2 SDRAM Chip Select Settings Table 18-14. SDRAM Example Specifications (Continued) This configuration results in a value of SDRAMDS = 0x0000_0019, as described in Table 18-16. 18.8.3 SDRAM Configuration 1 Register Settings This configuration results in a value of SDCFG1 = 0x7362_2830, as described in Table 18-17. The SDCFG1 register should be programmed as shown in Figure 18-16. 18.8.4 SDRAM Configuration 2 Register Settings The SDCFG2 register should be programmed as shown in Figure 18-17. This configuration results in a value of SDCFG2 = 0x4677_0000, as described in Table 18-18. 18.8.5 SDRAM Control Register Settings and PALL command Table 18-17. SDCFG1 Field Descriptions (Continued) This configuration results in a value of SDCR = 0xE10D_0002, as described in Table 18-19. 18.8.6 Set the Extended Mode Register The SDMR should be programmed as shown in Figure 18-19. This step enables the DDR memorys DLL. Figure 18-20. SDRAM Mode/Extended Mode Register Settings (SDMR) This configuration results in a value of SDMR = 0x048D_0000, as described in Table 18-21. This configuration results in a value of SDMR = 0x4001_0000, as described in Table 18-20. 18.8.8 Issue a PALL command This configuration results in a value of SDCR = 0xE10D_0002, as described in Table 18-22. Table 18-21. SDMR Field Descriptions 18.8.9 Perform Two Refresh Cycles This configuration results in a value of SDCR = 0xE10D_0004, as described in Table 18-19. Table 18-22. SDCR + MODE_EN and IPALL Field Descriptions (Continued) 18.8.10 Clear the Reset DLL Bit in the Mode Register This configuration results in a value of SDMR = 0x008D_0000, as described in Table 18-21. Figure 18-23. SDRAM Mode/Extended Mode Register Settings Table 18-24. SDMR Field Descriptions Table 18-23. SDCR + MODE_EN and IREF Field Descriptions (Continued) 18.8.11 Enable Automatic Refresh and Lock Mode Register This configuration results in a value of SDCR = 0x710D_0F00, as described in Table 18-25. Figure 18-24. SDRAM Control Register Settings + REF Table 18-25. SDCR + REF Field Descriptions Table 18-24. SDMR Field Descriptions (Continued) 18.8.12 Initialization Code Page Page Chapter 19 PCI Bus Controller 19.1 Introduction 19.1.1 Block Diagram 19.1.2 Overview 19.1.3 Features 19.2 External Signal Description 19.2.1 Address/Data Bus (PCIAD[31:0]) 19.2.2 Command/Byte Enables (PCICXBE[3:0]) Page 19.2.13 Target Ready (PCITRDY) 19.3 Memory Map/Register Definition Table 19-2. PCI Memory Map (Continued) 19.3.1 PCI Type 0 Configuration Registers Table 19-2. PCI Memory Map (Continued) 19.3.1.1 Device ID/Vendor ID Register (PCIIDR)PCI Dword Addr 0 19.3.1.2 PCI Status/Command Register (PCISCR)PCI Dword Addr 1 Figure 19-3. PCI Status/Command Register (PCISCR) Figure 19-2. Device ID/Vendor ID Register (PCIIDR) Table 19-3. PCIIDR Field Descriptions Table 19-4. PCISCR Field Descriptions 19.3.1.3 Revision ID/Class Code Register (PCICCRIR)PCI Dword 3 Figure 19-4. Revision ID/Class Code Register (PCICCRIR) Table 19-4. PCISCR Field Descriptions (Continued) 19.3.1.4 Configuration 1 Register (PCICR1)PCI Dword 3 Table 19-5. PCICCRIR Field Descriptions Figure 19-5. Configuration 1 Register (PCICR1) Table 19-6. PCICR1 Field Descriptions 19.3.1.5 Base Address Register 0 (PCIBAR0)PCI Dword 4 Figure 19-6. Base Address Register 0 (PCIBAR0) Table 19-7. PCIBAR0 Field Descriptions 19.3.1.6 Base Address Register 1 (PCIBAR1)PCI Dword 5 19.3.1.7 CardBus CIS Pointer Register PCICCPRPCI Dword A 19.3.1.8 Subsystem ID/Subsystem Vendor ID Registers PCISIDPCI Dword B 19.3.1.9 Expansion ROM Base Address PCIERBARPCI Dword C Not implemented. Fixed to 0x0000_0000 at address MBAR + 0xB30. 19.3.2 General Control/Status Registers Figure 19-8. Configuration 2 Register (PCICR2) Table 19-9. PCICR2 Field Descriptions 19.3.2.1 Global Status/Control Register (PCIGSCR) Figure 19-9. Global Status/Control Register (PCIGSCR) Table 19-10. PCIGSCR Field Descriptions 19.3.2.2 Target Base Address Translation Register 0 (PCITBATR0) Table 19-10. PCIGSCR Field Descriptions (Continued) 19.3.2.3 Target Base Address Translation Register 1 (PCITBATR1) 19.3.2.4 Target Control Register (PCITCR) Figure 19-12. Target Control Register (PCITCR) 19.3.2.5 Initiator Window 0 Base/Translation Address Register (PCIIW0BTAR) Table 19-13. PCITCR Field Descriptions Figure 19-13. Initiator Window 0 Base/Translation Address Register (PCIIW0BTAR) 19.3.2.6 Initiator Window 1 Base/Translation Address Register (PCIIW1BTAR) Table 19-14. PCIIW0BTAR Field Descriptions Figure 19-14. Initiator Window 1 Base/Translation Address Register (PCIIW1BTAR) 19.3.2.7 Initiator Window 2 Base/Translation Address Register (PCIIW2BTAR) Figure 19-16. Initiator Window Configuration Register (PCIIWCR) 19.3.2.8 Initiator Window Configuration Register (PCIIWCR) Figure 19-15. Initiator Window 2 Base/Translation Address Register (PCIIW2BTAR) 19.3.2.9 Initiator Control Register (PCIICR) Table 19-15. PCIIWCR Field Descriptions Figure 19-17. Initiator Control Register (PCIICR) 19.3.2.10 Initiator Status Register (PCIISR) Table 19-16. PCIICR Field Descriptions Figure 19-18. Initiator Status Register (PCIISR) 19.3.2.11 Configuration Address Register (PCICAR) Table 19-17. PCIISR Field Descriptions Figure 19-19. Configuration Address Register (PCICAR) Table 19-18. PCICAR Field Descriptions 19.3.3 Communication Subsystem Interface Registers Figure 19-20. Tx Packet Size Register (PCITPSR) 19.3.3.1 Comm Bus FIFO Transmit Interface Table 19-18. PCICAR Field Descriptions (Continued) 19.3.3.1.2 Tx Start Address Register (PCITSAR) Table 19-19. PCITPSR Field Descriptions 19.3.3.1.3 Tx Transaction Control Register (PCITTCR) Figure 19-22. Tx Transaction Control Register (PCITTCR) Table 19-21. PCITTCR Field Descriptions 19.3.3.1.4 Tx Enables Register (PCITER) Figure 19-23. Tx Enables Register (PCITER) Table 19-22. PCITER Field Descriptions 19.3.3.1.5 Tx Next Address Register (PCITNAR) Figure 19-24. Tx Next Address Register (PCITNAR) Table 19-22. PCITER Field Descriptions (Continued) 19.3.3.1.6 Tx Last Word Register (PCITLWR) 19.3.3.1.7 Tx Done Counts Register (PCITDCR) Figure 19-26. Tx Done Counts Register (PCITDCR) Table 19-23. PCITNAR Field Descriptions Figure 19-25. Tx Last Word Register (PCITLWR) Table 19-24. PCITLWR Field Descriptions 19.3.3.1.8 Tx Status Register (PCITSR) Table 19-25. PCITDCR Field Descriptions Figure 19-27. Tx Status Register (PCITSR) Table 19-26. PCITSR Field Descriptions Table 19-26. PCITSR Field Descriptions (Continued) 19.3.3.1.9 Tx FIFO Data Register (PCITFDR) 19.3.3.1.10 Tx FIFO Status Register (PCITFSR) Figure 19-29. Tx FIFO Status Register (PCITFSR) Figure 19-28. Tx FIFO Data Register (PCITFDR) Table 19-27. PCITFDR Field Descriptions 19.3.3.1.11 Tx FIFO Control Register (PCITFCR) Table 19-28. PCITFSR Field Descriptions Figure 19-30. Tx FIFO Control Register (PCITFCR) 19.3.3.1.12 Tx FIFO Alarm Register (PCITFAR) Table 19-29. PCITFCR Field Descriptions Figure 19-31. Tx FIFO Alarm Register (PCITFAR) 19.3.3.1.13 Tx FIFO Read Pointer Register (PCITFRPR) Table 19-30. PCITFAR Field Descriptions Figure 19-32. Tx FIFO Read Pointer Register (PCITFRPR) Table 19-31. PCITFRPR Field Descriptions 19.3.3.1.14 Tx FIFO Write Pointer Register (PCITFWPR) This marks the end of the PCI Comm Bus FIFO Transmit Interface description. 19.3.3.2 Comm Bus FIFO Receive Interface Figure 19-33. Tx FIFO Write Pointer Register (PCITFWPR) Table 19-32. PCITFWPR Field Descriptions 19.3.3.2.1 Rx Packet Size Register (PCIRPSR) 19.3.3.2.2 Rx Start Address Register (PCIRSAR) Figure 19-35. Rx Start Address Register (PCIRSAR) Figure 19-34. Rx Packet Size Register (PCIRPSR) Table 19-33. PCIRPSR Field Descriptions 19.3.3.2.3 Rx Transaction Control Register (PCIRTCR) Table 19-34. PCIRSAR Field Descriptions Figure 19-36. Rx Transaction Control Register (PCIRTCR) Table 19-35. PCIRTCR Field Descriptions 19.3.3.2.4 Rx Enables Register (PCIRER) Figure 19-37. Rx Enables Register (PCIRER) Table 19-35. PCIRTCR Field Descriptions (Continued) Table 19-36. PCIRER Field Descriptions 19.3.3.2.5 Rx Next Address Register (PCIRNAR) Figure 19-38. Rx Next Address Register (PCIRNAR) Table 19-37. PCIRNAR Field Descriptions Table 19-36. PCIRER Field Descriptions (Continued) 19.3.3.2.6 Rx Done Counts Register (PCIRDCR) Figure 19-39. Rx Done Counts Register (PCIRDCR) Table 19-38. PCIRDCR Field Descriptions 19.3.3.2.7 Rx Status Register (PCIRSR) Figure 19-40. Rx Status Register (PCIRSR) Table 19-39. PCIRSR Field Descriptions Figure 19-41. Rx FIFO Data Register (PCIRFDR) Table 19-40. PCIRFDR Field Description Table 19-39. PCIRSR Field Descriptions (Continued) 19.3.3.2.9 Rx FIFO Status Register (PCIRFSR) Figure 19-42. Rx FIFO Status Register (PCIRFSR) Table 19-41. PCIRFSR Field Descriptions 19.3.3.2.10 Rx FIFO Control Register (PCIRFCR) Figure 19-43. Rx FIFO Control Register (PCIRFCR) Table 19-42. PCIRFCR Field Descriptions Table 19-41. PCIRFSR Field Descriptions (Continued) 19.3.3.2.11 Rx FIFO Alarm Register (PCIRFAR) Figure 19-44. Rx FIFO Alarm Register (PCIRFAR) Table 19-43. PCIRFAR Field Descriptions Table 19-42. PCIRFCR Field Descriptions (Continued) 19.3.3.2.12 Rx FIFO Read Pointer Register (PCIRFRPR) 19.3.3.2.13 Rx FIFO Write Pointer Register (PCIRFWPR) Figure 19-46. Rx FIFO Write Pointer Register (PCIRFWPR) Figure 19-45. Rx FIFO Read Pointer Register (PCIRFRPR) Table 19-44. PCIRFRPR Field Descriptions 19.4 Functional Description 19.4.1 PCI Bus Protocol 19.4.1.1 PCI Bus Background 19.4.1.2 Basic Transfer Control 19.4.1.3 PCI Transactions Page Figure 19-48. PCI Write Terminated by Target 19.4.1.4 PCI Bus Commands Table 19-47. PCI Bus Commands 19.4.1.5 Addressing Page Page 19.4.2 Initiator Arbitration . 19.4.2.1 Priority Scheme 19.4.3 Configuration Interface 19.4.4 XL Bus Initiator Interface Page 19.4.4.1 Endian Translation Table 19-49. XL Bus to PCI Byte Lanes for Memory1 Transactions Table 19-49. XL Bus to PCI Byte Lanes for Memory1 Transactions (Continued) 19.4.4.2 Configuration Mechanism Page 19.4.4.3 Interrupt Acknowledge Transactions 19.4.4.4 Special Cycle Transactions 19.4.4.5 Transaction Termination 19.4.5 XL Bus Target Interface 19.4.5.1 Reads from Local Memory 19.4.5.2 Local Memory Writes 19.4.5.3 Data Translation Table 19-53. Aligned PCI to XL Bus Transfers Table 19-54. Non-Contiguous PCI to XL Bus Transfers (Requires Two XL Bus Accesses) 19.4.5.4 Target Abort 19.4.5.5 Latrule Disable 19.4.6 Communication Subsystem Initiator Interface 19.4.6.1 Access Width 19.4.6.2 Addressing 19.4.6.3 Data Translation 19.4.6.4 Initialization 19.4.6.5 Restart and Reset 19.4.6.6 PCI Commands 19.4.6.7 FIFO Considerations 19.4.6.8 Alarms 19.4.6.9 Bus Errors 19.4.7 PCI Clock Scheme 19.5 Application Information 19.5.1 XL Bus-Initiated Transaction Mapping 19.5.2 Address Maps Table 19-57. Transaction Mapping: XL Bus PCI 19.5.2.1 Address Translation Figure 19-54. Inbound Address Map Figure 19-55. Outbound Address Map Table 19-58. Address Register Accessibility 19.6 XL Bus Arbitration Priority Page Chapter 20 PCI Bus Arbiter Module 20.1 Introduction 20.1.1 Block Diagram Figure 20-1. PCI Arbiter Interface Diagram 20.1.2 Overview 20.2 External Signal Description 20.2.1 Frame (PCIFRM) 20.2.2 Initiator Ready (PCIIRDY) 20.2.3 PCI Clock (CLKIN) 20.2.4 External Bus Grant (PCIBG[4:1]) 20.3 Register Definition 20.3.1 PCI Arbiter Control Register (PACR) Table 20-2. PACR Field Descriptions 20.3.2 PCI Arbiter Status Register (PASR) 20.4 Functional Description 20.4.1 External PCI Requests Figure 20-3. PCI Arbiter Status Register (PASR) Table 20-3. PASR Field Descriptions 20.4.2 Arbitration 20.4.2.1 Hidden Bus Arbitration 20.4.2.2 Arbitration Scheme 20.4.2.3 Arbitration Latency 20.4.2.4 Arbitration Examples Page 20.4.3 Master Time-Out 20.5 Reset 20.6 Interrupts Chapter 21 FlexCAN 21.1 Introduction 21.1.1 Block Diagram 21.1.2 The CAN System A typical CAN system is shown below in Figure 21-3. 21.1.3 Features 21.1.4 Modes of Operation 21.1.4.1 Normal Mode 21.1.4.2 Freeze Mode 21.1.4.3 Module Disabled Mode 21.1.4.4 Loop-Back Mode 21.1.4.5 Listen-Only Mode 21.2 External Signals 21.2.1 CANTX[1:0] 21.2.2 CANRX[1:0] 21.3 Memory Map/Register Definition 21.3.1 FlexCAN Memory Map 21.3.2 Register Descriptions 21.3.2.1 FlexCAN Module Configuration Register (CANMCR) Table 21-2. CANMCR Field Descriptions 21.3.2.2 FlexCAN Control Register (CANCTRL) Figure 21-5. FlexCAN Control Register (CANCTRL) Table 21-2. CANMCR Field Descriptions (Continued) Table 21-3. CANCTRL Field Descriptions 21.3.2.3 FlexCAN Timer Register (TIMER) Table 21-3. CANCTRL Field Descriptions (Continued) 21.3.2.4 Rx Mask Registers Figure 21-7. FlexCAN Rx Global Mask Register (RXGMASK) Table 21-5. RXGMASK Field Descriptions Table 21-4. Mask Examples for Normal/Extended Messages (Continued) Page 21.3.2.5 FlexCAN Error Counter Register (ERRCNT) 21.3.2.6 FlexCAN Error and Status Register (ERRSTAT) Table 21-8 describes the ERRSTAT fields. Figure 21-11. FlexCAN Error and Status Register (ERRSTAT) Table 21-8. ERRSTAT Field Descriptions 21.3.2.7 Interrupt Mask Register (IMASK) Table 21-8. ERRSTAT Field Descriptions (Continued) Table 21-10 describes the IMASK fields. 21.3.2.8 Interrupt Flag Register (IFLAG) Table 21-11. FlexCAN Interrupt Flags Register (IFLAG) Table 21-12 describes the IFLAG fields. Table 21-9. FlexCAN Interrupt Mask Register (IMASK) Table 21-10. IMASK Field Descriptions 21.4 Functional Overview 21.4.1 Message Buffer Structure Page Table 21-14. Message Buffer Codes for Rx Buffers Table 21-13. Message Buffer Field Descriptions (Continued) 21.4.2 Message Buffer Memory Map Table 21-15. Message Buffer Code for Tx Buffers 21.4.3 Transmit Process 21.4.4 Arbitration Process 21.4.5 Receive Process 21.4.5.1 Self-Received Frames 21.4.6 Message Buffer Handling 21.4.6.1 Serial Message Buffers (SMBs) 21.4.6.2 Transmit Message Buffer Deactivation 21.4.6.3 Receive Message Buffer Deactivation 21.4.6.4 Locking and Releasing Message Buffers 21.4.7 CAN Protocol Related Frames 21.4.7.1 Remote Frames 21.4.7.2 Overload Frames 21.4.8 Time Stamp 21.4.9 Bit Timing 21.4.9.1 Configuring the FlexCAN Bit Timing 21.4.10 FlexCAN Error Counters 21.5 FlexCAN Initialization Sequence 21.5.1 Interrupts Page Chapter 22 Integrated Security Engine (SEC) 22.1 Features 22.2 ColdFire Security Architecture 22.3 Block Diagram 22.4 Overview 22.4.1 Bus Interface 22.4.2 SEC Controller Unit 22.4.2.1 Static EU Access 22.4.2.2 Dynamic EU Access 22.4.3 Crypto-Channels 22.4.4 Execution Units (EUs) 22.4.4.1 Data Encryption Standard Execution Unit (DEU) 22.4.4.2 Arc Four Execution Unit (AFEU) 22.4.4.3 Advanced Encryption Standard Execution Unit (AESU) 22.4.4.4 Message Digest Execution Unit (MDEU) Page 22.4.4.5 Random Number Generator (RNG) 22.5 Memory Map/Register Definition Table 22-3. SEC Register Map (Continued) 22.6 Controller 22.6.1 EU Access 22.6.2 Multiple EU Assignment 22.6.3 Multiple Channels 22.6.4 Controller Registers 22.6.4.1 EU Assignment Control Registers (EUACRH and EUACRL) Table 22-4 describes the EUACRH and EUACRL fields. Figure 22-7. EU Assignment Control Register High (EUACRH) Table 22-5. Channel Assignment Value 22.6.4.2 EU Assignment Status Registers (EUASRH and EUASRL) Figure 22-10. EU Assignment Status Register Low (EUASRL) Figure 22-9. EU Assignment Status Register High (EUASRH) Table 22-5. Channel Assignment Value (Continued) 22.6.4.3 SEC Interrupt Mask Registers (SIMRH and SIMRL) 22.6.4.4 SEC Interrupt Status Registers (SISRH and SISRL) 22.6.4.5 SEC Interrupt Control Registers (SICRH and SICRL) Page 22.6.4.6 SEC ID Register (SIDR) 22.6.4.7 SEC Master Control Register (SMCR) Figure 22-13. ID Register (SIDR) Figure 22-14. SEC Master Control Register (SMCR) Table 22-9. SMCR Field Descriptions 22.6.4.8 Master Error Address Register (MEAR) 22.7 Channels 22.7.1 Crypto-Channel Registers 22.7.1.1 Crypto-Channel Configuration Registers (CCCRn) Figure 22-16. Crypto-Channel Configuration Register (CCCRn) Table 22-11. CCCRn Field Descriptions Table 22-12 defines the burst size according to the value displayed in the BURST_SIZE field. 22.7.1.2 Crypto-Channel Pointer Status Registers (CCPSRHn and CCPSRLn) Table 22-12. Burst Size Definition Table 22-11. CCCRn Field Descriptions (Continued) Figure 22-18. Crypto-Channel Pointer Status Register Low (CCPSRLn) Table 22-14. CCPSRLn Field Descriptions Table 22-14. CCPSRLn Field Descriptions (Continued) Table 22-15 shows the values of crypto-channel states. Table 22-15. STATE Field Values Table 22-14. CCPSRLn Field Descriptions (Continued) Table 22-15. STATE Field Values (Continued) 22.7.1.3 Crypto-Channel Current Descriptor Pointer Register (CDPRn) 22.7.1.4 Fetch Register (FRn) 22.7.1.5 Data Packet Descriptor Buffer (CDBUFn) 22.8 ARC Four Execution Unit (AFEU) 22.8.1 AFEU Register Map 22.8.2 AFEU Reset Control Register (AFRCR) Figure 22-21. AFEU Reset Control Register (AFRCR) Table 22-18 describes AFEU reset control register fields. 22.8.3 AFEU Status Register (AFSR) Table 22-18. AFRCR Field Descriptions Figure 22-22. AFEU Status Register (AFSR) Table 22-19 describes AFEU status register fields. Table 22-19. AFSR Field Descriptions 22.8.4 AFEU Interrupt Status Register (AFISR) Table 22-20 describes AFEU interrupt status register fields. Figure 22-23. AFEU Interrupt Status Register (AFISR) Table 22-20. AFISR Field Descriptions Table 22-19. AFSR Field Descriptions (Continued) 22.8.5 AFEU Interrupt Mask Register (AFIMR) Table 22-20. AFISR Field Descriptions (Continued) Figure 22-24. AFEU Interrupt Mask Register (AFIMR) Table 22-21 describes AFEU interrupt mask register fields. Table 22-21. AFIMR Field Descriptions 22.9 Data Encryption Standard Execution Units (DEU) 22.9.1 DEU Register Map 22.9.2 DEU Reset Control Register (DRCR) Figure 22-25. DEU Reset Control Register (DRCR) Table 22-22 describes DEU reset control register fields. 22.9.3 DEU Status Register (DSR) Table 22-22. DRCR Field Descriptions Figure 22-26. DEU Status Register (DSR) Table 22-23 describes the DEU status registers bit settings. Table 22-23. DSR Field Descriptions 22.9.4 DEU Interrupt Status Register (DISR) Table 22-24 describes DEU interrupt register signals. Figure 22-27. DEU Interrupt Status Register (DISR) Table 22-24. DISR Field Descriptions Table 22-23. DSR Field Descriptions (Continued) Table 22-24. DISR Field Descriptions (Continued) 22.9.5 DEU Interrupt Mask Register (DIMR) Figure 22-28. DEU Interrupt Mask Register (DIMR) Table 22-25. DIMR Field Descriptions 22.10 Message Digest Execution Unit (MDEU) 22.10.1 MDEU Register Map 22.10.2 MDEU Reset Control Register (MDRCR) Figure 22-29. MDEU Reset Control Register (MDRCR) Table 22-26 describes MDEU reset control register fields. 22.10.3 MDEU Status Register (MDSR) Table 22-26. MDEURCR Field Descriptions Table 22-27 describes MDEU status register fields. Table 22-27. MDSR Field Descriptions 22.10.4 MDEU Interrupt Status Register (MDISR) Table 22-28 describes MDEU interrupt status register fields. Figure 22-31. MDEU Interrupt Status Register (MDISR) Table 22-28. MDISR Field Descriptions Table 22-27. MDSR Field Descriptions (Continued) 22.10.5 MDEU Interrupt Mask Register (MDIMR) Table 22-28. MDISR Field Descriptions (Continued) Figure 22-32. MDEU Interrupt Mask Register (MDIMR) Table 22-28 describes MDEU interrupt mask register fields. Table 22-29. MDIMR Field Descriptions 22.11 RNG Execution Unit (RNG) 22.11.1 RNG Register Map 22.11.2 RNG Reset Control Register (RNGRCR) 22.11.3 RNG Status Register (RNGSR) Figure 22-34. RNG Status Register (RNGSR) Table 22-31 describes RNG status register fields. Table 22-30. RNGRCR Field Descriptions 22.11.4 RNG Interrupt Status Register (RNGISR) Figure 22-35. RNG Interrupt Status Register (RNGISR) Table 22-31. RNGSR Field Descriptions Table 22-32 describes RNG interrupt status register fields. 22.11.5 RNG Interrupt Mask Register (RNGIMR) Table 22-33 describes RNG interrupt status register fields. Table 22-32. RNGISR Field Descriptions 22.12 Advanced Encryption Standard Execution Units (AESU) 22.12.1 AESU Register Map 22.12.2 AESU Reset Control Register (AESRCR) Figure 22-36. AESU Reset Control Register (AESRCR) Table 22-34 describes AESU reset control register fields. 22.12.3 AESU Status Register (AESSR) Table 22-34. AESRCR Field Descriptions Figure 22-37. AESU Status Register (AESSR) Table 22-35 describes AESU status register fields. Table 22-35. AESSR Field Descriptions 22.12.4 AESU Interrupt Status Register (AESISR) Table 22-36 describes AESU interrupt register fields. Figure 22-38. AESU Interrupt Status Register (AESISR) Table 22-36. AESISR Field Descriptions Table 22-35. AESSR Field Descriptions (Continued) 22.12.5 AESU Interrupt Mask Register (AESIMR) Table 22-36. AESISR Field Descriptions (Continued) Figure 22-39. AESU Interrupt Mask Register (AESIMR) Table 22-37 describes the AESU interrupt mask register fields. Table 22-37. AESIMR Field Descriptions 22.13 Descriptors 22.13.1 Descriptor Structure Figure 22-40. Data Packet Descriptor Format 22.13.1.1 Descriptor Header Figure 22-41. Descriptor Header Table 22-38 defines the header bits. Page Table 22-39. Descriptor Types Table 22-38. Header Bit Definitions (Continued) 22.13.1.2 Descriptor Length and Pointer Fields 22.13.1.3 Null Fields 22.13.1.4 Next Descriptor Pointer 22.13.2 Descriptor Chaining 22-62 Freescale Semiconductor Figure 22-45. Chain of Descriptors 22.13.3 Descriptor Type Formats Table 22-43. Descriptor Types Some of the inputs and outputs will be optional depending on the exact usage of the descriptor. Table 22-44. Descriptor Length/Pointer Mapping Table 22-43. Descriptor Types (Continued) 22.13.4 Descriptor Classes 22.13.4.1 Dynamic Descriptors 22.13.4.2 Static Descriptors Page 22.14 EU Specific Data Packet Descriptors 22.14.1 AFEU Mode Options and Data Packet Descriptors 22.14.1.1 Dynamically Assigned AFEU Table 22-49. AFEU Mode Register Field Descriptions Table 22-50. Descriptor for a Dynamically Assigned AFEU Using a Key 22.14.1.2 Statically Assigned AFEU Table 22-51. Descriptor for a Dynamically Assigned AFEU Using Context Table 22-52. First Descriptor for a Statically Assigned AFEU Using a Key Table 22-50. Descriptor for a Dynamically Assigned AFEU Using a Key (Continued) Table 22-53 shows the descriptor format to load a previously generated context into the AFEU. Table 22-53. First Descriptor for a Statically Assigned AFEU Using a Context Table 22-52. First Descriptor for a Statically Assigned AFEU Using a Key (Continued) Table 22-54. Middle Descriptor for a Statically Assigned AFEU Table 22-55. Final Descriptor for a Statically Assigned AFEU Table 22-53. First Descriptor for a Statically Assigned AFEU Using a Context (Continued) 22.14.2 DEU Mode Options and Data Packet Descriptors Table 22-56 describes DEU mode register fields. Figure 22-47. DEU Mode Options Table 22-56. DEU Mode Option Field Descriptions Table 22-55. Final Descriptor for a Statically Assigned AFEU (Continued) 22.14.2.1 Dynamically Assigned DEU Table 22-58 lists several different descriptors that use the format shown in Table 22-57. Table 22-57. Descriptor for a Dynamically Assigned DEU Table 22-58. Typical Header Values for Dynamic DEU Descriptor Format 22.14.2.2 Statically Assigned DEU Table 22-62 lists the specific descriptors that use the format shown in Table 22-61. Table 22-61. Middle Descriptor for a Statically Assigned DEU Table 22-62. Typical Header Values for Middle Static DEU Descriptor Format Table 22-60. Typical Header Values for First Static DEU Descriptor Format (Continued) Table 22-64 lists the specific descriptors that use the format shown in Table 22-63. Table 22-63. Final Descriptor for a Statically Assigned DEU Table 22-64. Typical Header Values Final Static DEU Descriptor Format Table 22-62. Typical Header Values for Middle Static DEU Descriptor Format (Continued) 22.14.3 MDEU Mode Options and Data Packet Descriptors Table 22-65 describes MDEU mode option fields. Figure 22-48. MDEU Mode Options Table 22-65. MDEU Mode Option Field Descriptions Table 22-64. Typical Header Values Final Static DEU Descriptor Format (Continued) 22.14.3.1 Recommended Settings for MDEU Mode Register 22.14.3.2 Dynamically Assigned MDEU Table 22-68 lists several different descriptors that use the format shown in Table 22-67. Table 22-69 shows the first descriptor for a statically assigned MDEU. 22.14.3.3 Statically Assigned MDEU Table 22-67. Descriptor for a Dynamically Assigned MDEU Table 22-68. Typical Header Values for Dynamic MDEU Format Table 22-70 lists several different descriptors that use the format shown in Table 22-69. Table 22-71 shows the middle descriptor for a statically assigned MDEU. Table 22-69. First Descriptor for a Statically Assigned MDEU Table 22-70. Typical Header Values for Using First Static MDEU Descriptor Format Table 22-71. Middle Descriptor for a Statically Assigned MDEU Table 22-73 shows the final descriptor for a statically assigned MDEU. Table 22-72. Typical Header Values for Using Middle Static MDEU Descriptor Format Table 22-73. Final Descriptor for a Statically Assigned MDEU Table 22-71. Middle Descriptor for a Statically Assigned MDEU (Continued) 22.14.4 RNG Data Packet Descriptors 22.14.5 AESU Mode Options and Data Packet Descriptors Table 22-76 describes AESU mode register fields. Figure 22-49. AESU Mode Options Table 22-76. AESU Mode Register Field Descriptions Table 22-75. RNG Descriptor Format (Continued) 22.14.5.1 Dynamically Assigned AESU Table 22-77. Descriptor for a Dynamically Assigned AESU Table 22-76. AESU Mode Register Field Descriptions (Continued) Table 22-78 lists several different descriptors that use the format shown in Table 22-77. 22.14.5.2 Statically Assigned AESU Table 22-69 shows the first descriptor for a statically assigned AESU. Table 22-78. Typical Header Values for Dynamic AESU Format Table 22-79. First Descriptor for a Statically Assigned AESU Table 22-77. Descriptor for a Dynamically Assigned AESU (Continued) Table 22-80 lists several different descriptors that use the format shown in Table 22-79. Table 22-81 shows the middle descriptor for a statically assigned AESU. Table 22-80. Typical Header Values for Using First Static AESU Descriptor Format Table 22-81. Middle Descriptor for a Statically Assigned AESU Table 22-79. First Descriptor for a Statically Assigned AESU (Continued) Table 22-83 shows the final descriptor for a statically assigned AESU. Table 22-82. Typical Header Values for Using Middle Static AESU Descriptor Format Table 22-83. Final Descriptor for a Statically Assigned AESU Table 22-84. Typical Header Values for Using Final Static AESU Descriptor Format 22.14.5.3 AESU-CCM Mode Descriptor Table 22-87 shows the format used for the context output for AES-CCM. Table 22-86. AES-CCM Encryption Context Input Format Table 22-87. AES-CCM Encryption Context Output Format Table 22-88. Descriptor for a AES-CCM Decryption Table 22-89 shows the format used for the context input for AES-CCM. 22.14.6 Multi-Function Data Packet Descriptors Table 22-89. AES-CCM Decryption Context Input Format Table 22-90. AES-CCM Decryption Context Output Format Table 22-88. Descriptor for a AES-CCM Decryption (Continued) 22.14.6.1 Snooping 22.14.6.2 Dynamic Multi-Function Descriptor Formats Page Page Table 22-95 lists typical DEU/HMAC multi-function descriptor header values. Table 22-94. Descriptor for Dynamic Multi-Function Encryption Table 22-95. Typical Header Values for Dynamic Multi-Function DEU Descriptors 22.14.6.3 Static Multi-Function Descriptor Formats Table 22-98 lists typical DEU/HMAC multi-function descriptor header values for the first descriptor. Table 22-97. First Descriptor for Static Multi-Function Encryption/Decryption Table 22-98. Typical Header Values for First Static Multi-Function DEU Descriptors Table 22-99 lists typical AESU/HMAC multi-function descriptor header values. Table 22-99. Typical Header Values for Dynamic Multi-Function AESU Descriptors Table 22-98. Typical Header Values for First Static Multi-Function DEU Descriptors (Continued) Page Table 22-102 lists typical AESU/HMAC multi-function descriptor header values. Table 22-102. Typical Header Values for Middle Static Multi-Function AESU Descriptors Table 22-101. Typical Header Values for Middle Static Multi-Function DEU Descriptors (Continued) Page Table 22-104. Typical Header Values for Final Static Multi-Function DEU Descriptors Table 22-103. Final Descriptor for Multi-Function Encrytion/Decryption (Continued) 22.14.6.4 SSLv3.1/TLS 1.0 Processing Descriptors Page Page Page Page Freescale Semiconductor 23-1 Chapter 23 IEEE 1149.1 Test Access Port (JTAG) to Debug Module 4-BIT TAP INSTRUCTION REGISTER 23.1 Introduction Figure 23-1. JTAG Block Diagram 23.2 External Signal Description 23.2.1 Detailed Signal Description 23.2.1.1 Test Mode 0 (MTMOD0) 23.2.1.2 Test Clock Input (TCK) 23.2.1.3 Test Mode Select/Breakpoint (TMS/BKPT) 23.2.1.4 Test Data Input/Development Serial Input (TDI/DSI) 23.2.1.5 Test Reset/Development Serial Clock (TRST/DSCLK) 23.2.1.6 Test Data Output/Development Serial Output (TDO/DSO) 23.3 Memory Map/Register Definition 23.3.1 Memory Map 23.3.2 Register Descriptions 23.3.2.1 Instruction Shift Register (IR) 23.3.2.2 IDCODE Register 23.3.2.3 Bypass Register 23.3.2.4 JTAG_CFM_CLKDIV Register 23.3.2.5 TEST_CTRL Register 23.3.2.6 Boundary Scan Register 23.4 Functional Description 23.4.1 JTAG Module 23.4.2 TAP Controller Figure 23-3. TAP Controller State Machine Flow 23.4.3 JTAG Instructions Table 23-5 describes public and private instructions. 23.4.3.1 External Test Instruction (EXTEST) 23.4.3.2 IDCODE Instruction 23.4.3.3 SAMPLE/PRELOAD Instruction 23.4.3.4 ENABLE_TEST_CTRL Instruction 23.4.3.5 HIGHZ Instruction 23.5 Initialization/Application Information 23.5.1 Restrictions 23.5.2 Nonscan Chain Operation Page Part IV Communications Subsystem Page Chapter 24 Multichannel DMA 24.1 Introduction 24.1.1 Block Diagram 24.1.2 Overview 24.1.2.1 Master DMA Engine (MDE) 24.1.2.2 Address and Data Sequencer (ADS) 24.1.2.3 Priority-Task Decoder (PTD) 24.1.2.4 Logic Unit with Redundancy Check (LURC) 24.2 External Signals 24.2.1 DREQ[1:0] 24.2.2 DACK[1:0] 24.3 Memory Map/Register Definitions 24.3.1 DMA Task Memory 24.3.2 Memory Structure Figure 24-2. DMA Programmer-Maintained Memory Model 24.3.3 DMA Registers 24.3.3.1 DMA Register Map Table 24-1 shows the memory map of the DMA module. Table 24-1. DMA Memory Map 24.3.3.2 Task Base Address Register (TaskBAR) Note that there is a 512-byte alignment restriction on the TaskBAR. Table 24-1. DMA Memory Map (Continued) 24.3.3.3 Current Pointer (CP) Figure 24-3. Task Base Address Register (TaskBAR) Table 24-2. TaskBAR Field Descriptions Figure 24-4. Current Pointer Register (CP) Table 24-3. CP Field Descriptions 24.3.3.4 End Pointer (EP) 24.3.3.5 Variable Pointer (VP) Figure 24-5. End Pointer Register (EP) Table 24-4. EP Field Descriptions Figure 24-6. Variable Pointer Register (VP) Table 24-5. VP Field Descriptions 24.3.3.6 PTD Control (PTD) Figure 24-7. PTD Control Register (PTD) Table 24-6. PTD Field Descriptions 24.3.3.7 DMA Interrupt Pending (DIPR) 24.3.3.8 DMA Interrupt Mask Register (DIMR) Figure 24-9. DMA Interrupt Mask Register (DIMR) Figure 24-8. DMA Interrupt Pending Register (DIPR) Table 24-7. DIPR Field Descriptions 24.3.3.9 Task Control Registers (TCRn) Table 24-8. DIMR Field Descriptions Figure 24-10. Task Control Register (TCRn) Table 24-9. TCRn Field Descriptions 24.3.3.10 Priority Registers (PRIORn) Figure 24-11. Priority Register Table 24-9. TCRn Field Descriptions (Continued) 24.3.3.11 Initiator Mux Control Register (IMCR) Table 24-10. PRIOR Field Descriptions Figure 24-12. Initiator Mux Control Register (IMCR) Figure 24-13. Initiator Assignments 24.3.3.12 Task Size Registers (TSKSZ[0:1]) Figure 24-13. Initiator Assignments (Continued) Figure 24-14. Task Size Register 0 (TSKSZ0) Figure 24-15. Task Size Register 1 (TSKSZ1) Table 24-11. TSKSZ Field Descriptions 24.3.3.13 Debug Comparator Registers (DBGCOMPn) 24.3.3.14 Debug Control (DBGCTL) Figure 24-17. Debug Control Register (DBGCTL) Figure 24-16. Debug Comparator Register (DBGCMPn) Table 24-12. Debug Comparator Field Descriptions Table 24-13. Debug Control Field Descriptions Table 24-14. Comparator 1 Type Bit Encoding 24.3.3.15 Debug Status (DBGSTAT) Table 24-15. Comparator 2 Type Bit Encodings Figure 24-18. Debug Status Register (DBGSTAT) Table 24-16. Debug Status Field Descriptions 24.3.3.16 PTD Debug Registers Figure 24-19. PTD Debug Register (PTDDBG) Table 24-17. PTD Debug Register Descriptions Table 24-16. Debug Status Field Descriptions (Continued) 24.3.4 External Request Module Registers 24.3.4.1 External Request Module Register Map 24.3.4.2 External Request Base Address Register (EREQBAR) 24.3.4.3 External Request Address Mask Register (EREQMASK) Figure 24-22. External Request Control Register (EREQCTRL) 24.3.4.4 External Request Control Register (EREQCTRL) Figure 24-20. External Request Base Address Register Figure 24-21. External Request Address Mask Register (EREQMASK) 24.4 Functional Description 24.4.1 Tasks 24.4.2 Descriptors 24.4.3 Task Initialization 24.4.4 Initiators 24.4.5 Prioritization 24.4.6 Context Switch 24.4.7 Data Movement 24.4.8 Data Manipulation 24.4.8.1 LURC Features 24.4.9 Line Buffers 24.4.9.1 Combine Write Enable 24.4.9.2 Read Line Enable 24.4.9.3 Speculative Prefetch 24.4.10 Termination of Loop 24.5 Programming Model 24.5.1 Register Initialization 24.5.2 Task Memory 24.5.2.1 Task Table Figure 24-23. Task Descriptor Table Format ................... Table 24-20. Behavior of Task Table Control Bits 24.6 Timing Diagrams 24.6.1 Level-Triggered Requests 24.6.2 Edge-Triggered Requests 24.6.3 Pipelined Requests Page Chapter 25 Comm Timer Module (CTM) 25.1 Introduction This chapter contains a detailed description of the Comm Timer Module (CTM). 25.1.1 Block Diagrams Figure 25-1. CTM High Level Block Diagram 25.1.2 Overview 25.1.3 Comm Timer External Clock[7:0] 25.2 Memory Map/Register Definition 25.2.1 Timer Module Register Map 25.2.2 Register Descriptions 25.2.2.1 Comm Timer Configuration Register (CTCRn)Fixed Timer Channel Figure 25-4. Comm Timer Configuration Register (CTCRn)Fixed Timer Channel Table 25-2. Timer Memory Map 25.2.2.2 Comm Timer Configuration Register (CTCRn)Variable Timer Channel Table 25-3. CTCRnFixed Timer Channel Field Descriptions The initiator mode is different from that of a fixed channel in that the period is variable 25.3 Functional Description 25.3.1 Variable Timer in Baud Clock Generator Mode 25.3.2 Fixed Timer in Initiator Mode 25.3.2.1 Fixed Timer in Initiator Mode Example 25.3.3 Variable Timer in Initiator Mode 25.3.3.1 Variable Timer in Initiator Mode Example Page Page Chapter 26 Programmable Serial Controller (PSC) 26.1 Introduction 26.1.1 Block Diagram 26.1.2 Overview 26.1.3 Features 26.2 Signal Description 26.2.1 PSCnCTS/PSCBCLK 26.2.2 PSCnRTS/PSCFSYNC 26.2.3 PSCnRXD 26.2.4 PSCnTXD 26.3 Memory Map/Register Definition 26.3.1 Overview 26.3.2 Module Memory Map The names and address locations of all control registers are listed in Table 26-2. Table 26-1. PSC Signal Properties Table 26-2. PSC Memory Map (Continued) 26.3.3 Register Descriptions 26.3.3.1 Mode Register 1(PSCMR1n) 26.3.3.2 Mode Register 2 (PSCMR2n) Table 26-3. PSCMR1n Field Descriptions Figure 26-3. PSC Mode Register 2 (PSCMR2n) Table 26-4. PSCMR2n Field Descriptions 26.3.3.3 Status Register (PSCSRn) Figure 26-4. PSC Status Register (PSCSRn) Table 26-4. PSCMR2n Field Descriptions Table 26-5. PSCSRn Field Descriptions 26.3.3.4 Clock Select Register (PSCCSRn) Figure 26-5. UART and SIR Baud Rate Clocking Sources Table 26-5. PSCSRn Field Descriptions (Continued) 26.3.3.5 Command Register (PSCCRn) Figure 26-8. PSC Command Register (PSCCRn) Figure 26-6. Clock Select Register (PSCCSRn) Figure 26-7. PSCCSRn Field Descriptions Table 26-6. RCSEL[3:0] and TCSEL[3:0] Table 26-7. PSCCRn Field Descriptions Table 26-7. PSCCRn Field Descriptions (Continued) 26.3.3.6 Receiver Buffer (PSCRBn) and Transmitter Buffer (PSCTBn) Figure 26-10 shows the modem 16 register. Figure 26-11 shows the AC97 mode register. Figure 26-10. Receiver (PSCRBn) and Transmitter (PSCTBn) Buffer Register for Modem 16 Mode Table 26-8 shows the fields for Modem 8, SIR, MIR, and FIR modes. Table 26-9 shows the fields for Modem 16 mode. Table 26-10 shows the fields for AC 97 mode. Table 26-9. PSCRBn and PSCTBn Field Descriptions for Modem 16 Mode Table 26-10. PSCRBn and PSCTBn AC 97 Mode Field Descriptions 26.3.3.7 Input Port Change Register (PSCIPCRn) PSCIPCRn shows the current state and the change-of-state for the modem control input port. Figure 26-12. Input Port Change Register (PSCIPCRn) Table 26-11. PSCIPCRn Field Descriptions Table 26-10. PSCRBn and PSCTBn AC 97 Mode Field Descriptions 26.3.3.8 Auxiliary Control Register (PSCACRn) PSCACR controls the handshake of the transmitter/receiver. Figure 26-14. Interrupt Status Register (PSCISRn) 26.3.3.9 Interrupt Status Register (PSCISRn) Figure 26-13. Auxiliary Control Register (PSCACRn) Table 26-12. PSCACRn Field Descriptions 26.3.3.10 Interrupt Mask Register (PSCIMRn) Table 26-13. PSCISRn Field Descriptions Figure 26-15. Interrupt Mask Register (PSCIMRn) Table 26-14. PSCIMRn Field Descriptions 26.3.3.11 Counter Timer Registers (PSCCTURn, PSCCTLRn) The PSCIP shows the current state of the input ports. 26.3.3.12 Input Port (PSCIPn) Figure 26-16. Counter Timer Upper Register (PSCCTURn) Table 26-15. PSCCTURn Field Descriptions Table 26-16. PSCCTLRn Field Descriptions 26.3.3.13 Output Port Bit Set (PSCOPSETn) Output ports are asserted by writing to this register. 26.3.3.14 Output Port Bit Reset (PSCOPRESETn) Output ports are negated by writing to this register. Table 26-18. PSCOPSETn Field Descriptions 26.3.3.15 PSC/IrDA Control Register (PSCSICRn) This register sets the main operation mode. Table 26-20. PSCSICRn Field Descriptions Table 26-21. SIM[2:0] 26.3.3.16 Infrared Control Register 1 (PSCIRCR1n) This register controls the configuration in IrDA mode. This register sets some requests to the transmitter or the TxFIFO. 26.3.3.17 Infrared Control Register 2 (PSCIRCR2n) Table 26-22. PSCIRCR1n Field Descriptions 26.3.3.18 Infrared SIR Divide Register (PSCIRSDRn) 26.3.3.19 Infrared MIR Divide Register (PSCIRMDRn) This register sets the baud rate in MIR mode. Table 26-24. PSCIRSDRn Field Descriptions Table 26-23. PSCIRCR2n Field Descriptions (Continued) 26.3.3.20 Infrared FIR Divide Register (PSCIRFDRn) This register sets the baud rate in FIR mode. Table 26-25. PSCIRMDRn Field Descriptions Eqn. 26-1 Table 26-26. Frequency Selection in MIR Mode 26.3.3.21 Rx and Tx FIFO Counter Register (PSCRFCNTn, PSCTFCNTn) This register applies to all modes. These registers provide access to the internal Rx and Tx FIFOs. 26.3.3.22 Rx and Tx FIFO Data Register (PSCRFDRn, PSCTFDRn) Table 26-27. PSCIRFDRn Field Descriptions 26.3.3.23 Rx and Tx FIFO Status Register (PSCRFSRn, PSCTFSRn) Table 26-30. PSCRFSRn and PSCTFSRn Field Descriptions 26.3.3.24 Rx and Tx FIFO Control Register (PSCRFCRn, PSCTFCRn) Page 26.3.3.25 Rx and Tx FIFO Alarm Register (PSCRFARn, PSCTFARn) 26.3.3.26 Rx and Tx FIFO Read Pointer (PSCRFRPn, PSCTFRPn) Table 26-31. PSCRFCRn and PSCRTFCRn Field Descriptions (Continued) 26.3.3.27 Rx and Tx FIFO Write Pointer (PSCRFWPn, PSCTFWPn) 26.3.3.28 Rx and Tx FIFO Last Read Frame Pointer (PSCRLRFPn, PSCTLRFPn) 26.3.3.29 Rx and Tx FIFO Last Write Frame Pointer (PSCRLWFPn, PSCTLWFPn) 26.4 Functional Description 26.4.1 UART Mode 26.4.2 Multidrop Mode 26.4.3 Modem8 Mode 26.4.4 Modem16 Mode Figure 26-31. Waveform of Modem16 Mode Figure 26-33. An Example Connection to AC97 CODEC 26.4.5 AC97 Mode Figure 26-32 shows the waveform in AC97 modem mode. Figure 26-32. Waveform of AC97 Mode 26.4.5.1 Transmitter 26.4.5.2 Receiver 26.4.5.3 Low Power Mode 26.4.6 SIR Mode 26.4.7 MIR Mode 26.4.7.1 Data Format 26.4.7.2 Serial Interaction Pulse (SIP) 26.4.8 FIR Mode 26.4.8.1 Data Format 26.4.9 PSC FIFO System 26.4.9.1 RX FIFO 26.4.9.2 TX FIFO 26.4.10 Looping Modes 26.4.10.1 Automatic Echo Mode 26.4.10.2 Local Loopback Mode 26.4.10.3 Remote Loopback Mode 26.5 Resets 26.5.1 General 26.5.2 Description of Reset Operation 26.5.2.1 Reset 26.5.2.2 CRSRX 26.6 Interrupts 26.6.1 Description of Interrupt Operation 26.6.1.1 Processor Interrupt 26.7 Software Environment 26.7.1 General 26.7.2 Configuration 26.7.2.1 UART Mode The following is a sample initialization sequence for UART mode. Table 26-41. Sample Initialization Sequence for UART Mode 26.7.2.2 Modem8 Mode Table 26-42. Sample Initialization Sequence for Modem8 Mode Table 26-41. Sample Initialization Sequence for UART Mode (Continued) 26.7.2.3 Modem16 Mode 26.7.2.4 AC97 Mode Table 26-43. A Sample Initialization Sequence for AC97 Mode Table 26-42. Sample Initialization Sequence for Modem8 Mode (Continued) 26.7.2.5 SIR Mode Here is a sample configuration sequence in SIR mode. Table 26-44. A Sample Initialization Sequence for SIR Mode Table 26-43. A Sample Initialization Sequence for AC97 Mode (Continued) 26.7.2.6 MIR Mode Table 26-45. A Sample Initialization Sequence for MIR Mode Table 26-44. A Sample Initialization Sequence for SIR Mode (Continued) 26.7.2.7 FIR Mode Table 26-46. A Sample Initialization Sequence for FIR Mode Table 26-45. A Sample Initialization Sequence for MIR Mode (Continued) 26.7.3 Programming 26.7.3.1 MIR Mode Table 26-46. A Sample Initialization Sequence for FIR Mode (Continued) 26.7.3.2 FIR Mode Chapter 27 DMA Serial Peripheral Interface (DSPI) 27.1 Overview 27.2 Features 27.3 Block Diagram 27.4 Modes of Operation 27.4.1 Master Mode 27.4.2 Slave Mode 27.5 Signal Description 27.5.1 Overview 27.5.2 Detailed Signal Descriptions 27.5.2.1 DSPI Peripheral Chip Select/Slave Select (DSPICS0/SS) 27.5.2.2 DSPI Peripheral Chip Selects 23 (DSPICS[2:3]) 27.6 Memory Map and Registers Table 27-2 shows the DSPI memory map. Table 27-2. DSPI Memory Map 27.6.1 DSPI Module Configuration Register (DMCR) Figure 27-2. DSPI Module Configuration Register (DMCR) Table 27-3. DMCR Field Descriptions Table 27-3. DMCR Field Descriptions (Continued) 27.6.2 DSPI Transfer Count Register (DTCR) 27.6.3 DSPI Clock and Transfer Attributes Registers 07 (DCTARn) Page Page Page 27.6.4 DSPI Status Register (DSR) Figure 27-5. DSPI Status Register (DSR) Table 27-8. DSPI Baud Rate Scaler Table 27-9. DSR Field Descriptions 27.6.5 DSPI DMA/Interrupt Request Select Register (DIRSR) Figure 27-6. DSPI DMA/Interrupt Request Select Register (DIRSR) Table 27-9. DSR Field Descriptions (Continued) Page 27.6.6 DSPI Tx FIFO Register (DTFR) Figure 27-7. DSPI Tx FIFO Register (DTFR) Table 27-10. DTFR Field Descriptions 27.6.7 DSPI Rx FIFO Register (DRFR) Figure 27-8. DSPI Rx FIFO Register (DRFR) Table 27-11. DRFR Field Descriptions Table 27-10. DTFR Field Descriptions (Continued) 27.6.8 DSPI Tx FIFO Debug Registers 03 (DTFDRn) 27.6.9 DSPI Rx FIFO Debug Registers 03 (DRFDRn) Figure 27-9. DSPI Tx FIFO Debug Register (DTFDRn) Table 27-12. DTFDRx Field Descriptions 27.7 Functional Description 27.7.1 Start and Stop of DSPI Transfers 27.7.2 Serial Peripheral Interface (SPI) 27.7.2.1 Master Mode 27.7.2.2 Slave Mode 27.7.2.3 FIFO Disable Operation 27.7.2.4 Tx FIFO Buffering Mechanism 27.7.2.5 Rx FIFO Buffering Mechanism 27.7.3 DSPI Baud Rate and Clock Delay Generation 27.7.3.1 Baud Rate Generator 27.7.3.2 CS to SCK Delay (tCSC) 27.7.3.3 After DSPISCK Delay (tASC) 27.7.3.4 Delay after Transfer (tDT) 27.7.3.5 Peripheral Chip Select Strobe Enable (PCSS) 27.7.4 Transfer Formats 27.7.4.1 Classic SPI Transfer Format (CPHA = 0) 27.7.4.2 Classic SPI Transfer Format (CPHA = 1) 27.7.4.3 Modified SPI Transfer Format (MTFE = 1, CPHA = 0) 27.7.4.4 Modified SPI Transfer Format (MTFE = 1, CPHA = 1) 27.7.4.5 Continuous Selection Format 27.7.5 Continuous Serial Communications Clock Figure 27-21. Continuous DSPISCK Timing Diagram (CSCK = 0) Figure 27-22. Continuous DSPISCK Timing Diagram (CSCK = 1) 27.7.6 Interrupts/DMA Requests Table 27-21. Interrupt and DMA Request Conditions Page 27.8 Initialization and Application Information 27.8.1 How to Change Queues 27.8.2 Baud Rate Settings 27.8.3 Delay Settings Table 27-22. Baud Rate Values 27.8.4 Calculation of FIFO Pointer Addresses 27.8.4.1 Address Calculation for the First-in Entry and Last-in Entry in the Tx FIFO 27.8.4.2 Address Calculation for the First-in Entry and Last-in Entry in the Rx FIFO Chapter 28 I2C Interface 28.1 Introduction Figure 28-1. I2C Block Diagram 28.1.1 Block Diagram A block diagram of the I2C module is shown in Figure 28-1. 28.2 External Signals 28.3 Memory Map/Register Definition 28.3.1 I2C Register Map 28.3.2 Register Descriptions 28.3.2.1 I2C Address Register (I2ADR) Table 28-2. I2C Memory Map 28.3.2.2 I2C Frequency Divider Register (I2FDR) Figure 28-3. I2C Frequency Divider Register (I2FDR) Table 28-4. I2FDR Field Descriptions 28.3.2.3 I2C Control Register (I2CR) This I2SR contains bits that indicate transaction direction and status. 28.3.2.4 I2C Status Register (I2SR) Figure 28-4. I2C Control Register (I2CR) Table 28-5. I2CR Field Descriptions Figure 28-5. I2C Status Register (I2SR) Table 28-6. I2SR Field Descriptions 28.3.2.5 I2C Data I/O Register (I2DR) 28.3.2.6 I2C Interrupt Control Register (I2ICR) 28.4 Functional Description BNBE TE RE IE Figure 28-7. Interrupt Control Register Table 28-8. I2ICR Field Descriptions T able 28-9. I 28.4.1 START Signal 28.4.2 Slave Address Transmission 28.4.3 STOP Signal 28.4.4 Data Transfer 28.4.5 Acknowledge 28.4.6 Repeated Start 28.4.7 Clock Synchronization and Arbitration 28.4.8 Handshaking and Clock Stretching 28.5 Initialization Sequence 28.5.1 Transfer Initiation and Interrupt 28.5.2 Post-Transfer Software Response 28.5.3 Generation of STOP 28.5.4 Generation of Repeated START 28.5.5 Slave Mode Page 28.5.6 Arbitration Lost 28.5.7 Flow Control Figure 28-14. Flow-Chart of Typical I2C Interrupt Routine Freescale Semiconductor 28-19 Page Chapter 29 USB 2.0 Device Controller 29.1 Introduction 29.1.1 Overview 29.1.2 Features 29.1.3 Block Diagram 29.1.3.1 Controller and Synchronization 29.1.3.2 Descriptor RAM 29.1.3.3 FIFO Controller 29.1.3.4 FIFO RAM Manager 29.1.3.5 Integrated USB 2.0 Transceiver 29.2 Memory Map/Register Definition 29.2.1 USB Memory Map Page Page Page Page 29.2.2 USB Request, Control, and Status Registers The USBSR reports the current state of various features of the module. This register is read only. 29.2.2.1 USB Status Register (USBSR) Figure 29-2. USB Status Register (USBSR) Table 29-2. USBSR Field Descriptions 29.2.2.2 USB Control Register (USBCR) The USBCR configures features of the module. Figure 29-3. USB Control Register (USBCR) Table 29-2. USBSR Field Descriptions Table 29-3. USBCR Field Descriptions 29.2.2.3 USB Descriptor RAM Control Register (DRAMCR) Figure 29-4. USB Descriptor RAM Control Register (DRAMCR) Table 29-3. USBCR Field Descriptions (Continued) 29.2.2.4 USB Descriptor RAM Data Register (DRAMDR) The DRAMDR allows user access to the USB descriptor memory. Figure 29-5. USB Descriptor RAM Data Register (DRAMDR) Table 29-4. DRAMCR Field Descriptions 29.2.2.5 USB Interrupt Status Register (USBISR) 29.2.2.6 USB Interrupt Mask Register (USBIMR) Setting a bit in the USBIMR masks the corresponding interrupt in the USBISR. Figure 29-7. USB Interrupt Mask Register (USBIMR) Table 29-6. USBISR Field Descriptions (Continued) 29.2.2.7 USB Application Interrupt Status Register (USBAISR) Table 29-7. USBIMR Field Descriptions 29.2.2.8 USB Application Interrupt Mask Register (USBAIMR) 29.2.2.9 Endpoint Info Register (EPINFO) 29.2.2.10 USB Configuration Value Register (CFGR) 29.2.2.11 USB Configuration Attribute Register (CFGAR) The CFGAR contains attributes of the current configuration. Figure 29-10. Endpoint Info Register (EPINFO) Table 29-10. EPINFO Field Descriptions Figure 29-11. USB Configuration Value Register (CFGR) Table 29-11. CFGR Field Descriptions 29.2.2.12 USB Device Speed Register (SPEEDR) Figure 29-12. USB Configuration Attribute Register (CFGAR) Table 29-12. CFGAR Field Descriptions Figure 29-13. USB Device Speed Register (SPEEDR) Table 29-13. SPEEDR Field Descriptions 29.2.2.13 USB Frame Number Register (FRMNUMR) 29.2.2.14 USB Endpoint Transaction Number Register (EPTNR) 29.2.2.15 USB Application Interface Update Register (IFUR) 29.2.2.16 USB Configuration Interface Register (IFRn) 29.2.3 USB Counter Registers 29.2.3.1 USB Packet Passed Count Register (PPCNT) Figure 29-17. USB Configuration Interface Register (IFRn) Table 29-17. IFRn Field Descriptions Figure 29-18. USB Packet Passed Count Register (PPCNT) Table 29-18. PPCNT Field Descriptions 29.2.3.2 USB Dropped Packet Counter Register (DPCNT) 29.2.3.3 USB CRC Error Counter Register (CRCECNT) Figure 29-21. USB Bitstuffing Error Counter Register (BSECNT) 29.2.3.4 USB Bitstuffing Error Counter Register (BSECNT) Figure 29-19. USB Dropped Packet Counter Register (DPCNT) Table 29-19. DPCNT Field Descriptions 29.2.3.5 USB PID Error Counter Register (PIDECNT) 29.2.3.6 USB Framing Error Counter Register (FRMECNT) Table 29-21. BSECNT Field Descriptions Figure 29-22. USB PID Error Counter Register (PIDECNT) Table 29-22. PIDECNT Field Descriptions Figure 29-23. USB Framing Error Counter Register (FRMECNT) Table 29-23. FRMECNT Field Descriptions 29.2.3.7 USB Transmitted Packet Counter Register (TXPCNT) 29.2.3.8 USB Counter Overflow Register (CNTOVR) Figure 29-25. USB Counter Overflow Register (CNTOVR) Table 29-25. CNTOVR Field Descriptions 29.2.4 Endpoint Context Registers 29.2.4.1 Endpoint n Attribute Control Register (EP0ACR, EPnOUTACR, EPnINACR) 29.2.4.2 Endpoint n Max Packet Size Register (EP0MPSR, EPnOUTMPSR, EPnINMPSR) 29.2.4.3 Endpoint n Interface Number Register (EP0IFR, EPnOUTIFR, EPnINIFR) Figure 29-30. Endpoint n Interface Number Register OUT (EPnOUTIFR) 29.2.4.4 Endpoint n Status Register (EP0SR, EPnOUTSR, EPnINSR) Figure 29-32. Endpoint n Status Register OUT (EPnOUTSR) 29.2.4.5 bmRequest Type Register (BMRTR) The BMRTR records the bmRequestType field of a SETUP transaction on Endpoint 0. Figure 29-34. Endpoint n bmRequest Type Register (BMRTR) Table 29-29. EPnOUTSR and EPnINSR Field Descriptions 29.2.4.6 bRequest Type Register (BRTR) The BRTR records the bRequest field of a SETUP transaction on Endpoint 0. Figure 29-36. wValue Register (WVALUER) The WVALUER records the wValue field of a SETUP transaction on Endpoint 0. 29.2.4.7 wValue Register (WVALUER) 29.2.4.8 wIndex Register (WINDEXR) The WINDEXR records the wIndex field of a SETUP transaction on Endpoint 0. 29.2.4.9 wLength Register (WLENGTHR) The WLENGTHR records the wLength field of a SETUP transaction on Endpoint 0. 29.2.4.10 Endpoint n Sync Frame Register (EPnOUTSFR, EPnINSFR) 29.2.5 USB Endpoint FIFO Registers The EPnSTAT register allows the user to configure specific aspects of an individual endpoint. These registers are used to configure and access the FIFOs for each of the USB endpoints. 29.2.5.1 USB Endpoint n Status and Control Register (EPnSTAT) Figure 29-39. Endpoint n Sync Frame Register OUT (EPnOUTSF) 29.2.5.2 USB Endpoint n Interrupt Status Register (EPnISR) Page 29.2.5.3 USB Endpoint n Interrupt Mask Register (EPnIMR) Figure 29-43. USB Endpoint n Interrupt Mask Register (EPnIMR) Table 29-37. EPnISR Field Descriptions 29.2.5.4 USB Endpoint n FIFO RAM Configuration Register (EPnFRCFGR) Table 29-38. EPnIMR Field Descriptions 29.2.5.5 USB Endpoint n FIFO Data Register (EPnFDR) Figure 29-45. USB Endpoint n FIFO Data Register (EPnFDR) 29.2.5.6 USB Endpoint n FIFO Status Register (EPnFSR) Table 29-40. EPnFDR Field Descriptions Figure 29-46. USB Endpoint n FIFO Status Register (EPnFSR) Table 29-41. EPnFSR Field Descriptions Table 29-41. EPnFSR Field Descriptions 29.2.5.7 USB Endpoint n FIFO Control Register (EPnFCR) Figure 29-47. USB Endpoint n FIFO Control Register (EPnFCR) Table 29-42. EPnFCR Field Descriptions Table 29-42. EPnFCR Field Descriptions (Continued) 29.2.5.8 USB Endpoint n FIFO Alarm Register (EPnFAR) Figure 29-48. USB Endpoint n Alarm Register (EPnFAR) Table 29-43. EPnFAR Field Descriptions 29.2.5.9 USB Endpoint n FIFO Read Pointer (EPnFRP) 29.2.5.10 USB Endpoint n FIFO Write Pointer (EPnFWP) Figure 29-50. USB Endpoint n FIFO Write Pointer (EPnFWP) Figure 29-49. USB Endpoint n FIFO Read Pointer (EPnFRP) Table 29-44. EPnFRP Field Descriptions 29.2.5.11 USB Endpoint n Last Read Frame Pointer (EPnLRFP) Table 29-45. EPnFWP Field Descriptions 29.2.5.12 USB Endpoint n Last Write Frame Pointer (EPnLWFP) 29.3 Functional Description 29.3.1 Interrupts 29.4 Software Interface 29.4.1 Device Initialization 29.4.1.1 USB Descriptor Download 29.4.1.2 USB Interrupt Register 29.4.1.3 Endpoint Registers 29.4.1.4 FIFO Sizes 29.4.1.5 Enable the Device 29.4.2 Exception Handling 29.4.2.1 Unable to Fill or Empty FIFO Due to Temporary Problem 29.4.2.2 Catastrophic Error 29.4.3 Data Transfer Operations 29.4.3.1 USB Packets 29.4.3.2 Sending Packets 29.4.3.3 Receiving Packets 29.4.3.4 USB Transfers 29.4.3.5 Control Transfers 29.4.3.6 Bulk Traffic 29.4.3.7 Interrupt Traffic 29.4.3.8 Isochronous Operations Page Chapter 30 Fast Ethernet Controller (FEC) 30.1 Introduction 30.1.1 MCF548x Family Products 30.1.2 Block Diagram 30.1.3 Overview 30.1.4 Features 30.1.5 Modes of Operation 30.1.5.1 Full and Half Duplex Operation 30.1.5.2 Interface Options 30.1.5.3 Address Recognition Options 30.2 External Signals 30.2.1 Transmit Clock (EnTXCLK) 30.2.2 Receive Clock (EnRXCLK) 30.2.3 Transmit Enable (EnTXEN) 30.2.4 Transmit Data[3:0] (EnTXD[3:0]) Page 30.3 Memory Map/Register Definition 30.3.1 Top Level Module Memory Map 30.3.2 Detailed Memory Map (Control/Status Registers) Table 30-5. FEC Register Memory Map 30.3.3 MIB Block Counters Memory Map Table 30-6. MIB Counters Memory Map 30.3.3.1 Ethernet Interrupt Event Register (EIR) Table 30-6. MIB Counters Memory Map (Continued) Page 30.3.3.2 Interrupt Mask Register (EIMR) Table 30-7. EIR Descriptions (Continued) 30.3.3.3 Ethernet Control Register (ECR) Figure 30-4. Ethernet Control Register (ECR) Figure 30-3. Ethernet Interrupt Mask Register (EIMR) Table 30-8. EIMR Field Descriptions 30.3.3.4 MII Management Frame Register (MMFR) Table 30-9. ECR Field Descriptions Figure 30-5. MII Management Frame Register (MMFR) Table 30-10. MMFR Field Descriptions 30.3.3.5 MII Speed Control Register (MSCR) Page 30.3.3.6 MIB Control Register (MIBC) 30.3.3.7 Receive Control Register (RCR) 30.3.3.8 Receive Hash Register (RHR) Figure 30-8. Receive Control Register (RCR) Table 30-14. RCR Field Descriptions 30.3.3.9 Transmit Control Register (TCR) Figure 30-10. Transmit Control Register (TCR) Figure 30-9. Receive Hash Register (RHR) Table 30-15. RHR Bits Description 30.3.3.10 Physical Address Low Register (PALR) Table 30-16. TCR Field Descriptions 30.3.3.11 Physical Address High Register (PAHR) Figure 30-12. Physical Address High Register (PAHR) Figure 30-11. Physical Address Low Register (PALR) Table 30-17. PALR Field Descriptions 30.3.3.12 Opcode/Pause Duration Register (OPD) 30.3.3.13 Individual Address Upper Register (IAUR) 30.3.3.14 Individual Address Lower Register (IALR) Figure 30-17. Individual Address Lower Register (IALR) Figure 30-16. Individual Address Upper Register (IAUR) Table 30-20. IAUR Field Descriptions 30.3.3.15 Group Address Upper Register (GAUR) 30.3.3.16 Group Address Lower Register (GALR) 30.3.3.17 FEC Transmit FIFO Watermark Register (FECTFWR) 30.3.3.18 FEC Receive FIFO Data Register (FECRFDR) 30.3.3.19 FEC Receive FIFO Status Register (FECRFSR) Figure 30-22. FEC Receive FIFO Status Register (FECRFSR) Table 30-26. FECRFSR Field Descriptions 30.3.3.20 FEC Receive FIFO Control Register (FECRFCR) Figure 30-23. FEC Receive FIFO Control Register (FECRFCR) Table 30-27. FECRFCR Field Descriptions 30.3.3.21 FEC Receive FIFO Last Read Frame Pointer Register (FECRLRFP) 30.3.3.22 FEC Receive FIFO Last Write Frame Pointer Register (FECRLWFP) 30.3.3.23 FEC Receive FIFO Alarm Register (FECRFAR) 30.3.3.24 FEC Receive FIFO Read Pointer Register (FECRFRP) Figure 30-27. FEC Receive FIFO Read Pointer Register (FECRFRP) Figure 30-26. FEC Receive FIFO Alarm Register (FECRFAR) Table 30-30. FECRFAR Field Descriptions 30.3.3.25 FEC Receive FIFO Write Pointer Register (FECRFWP) 30.3.3.26 FEC Transmit FIFO Data Register (FECTFDR) 30.3.3.27 FEC Transmit FIFO Status Register (FECTFSR) Figure 30-30. FEC Transmit FIFO Status Register (FECTFSR) Figure 30-29. FEC Transmit FIFO Data Register (FECTFDR) Table 30-33. FECTFDR Field Descriptions Table 30-34. FECTFSR Field Descriptions 30.3.3.28 FEC Transmit FIFO Control Register (FECTFCR) Figure 30-31. FEC Transmit FIFO Control Register (FECTFCR) Table 30-35. FECTFCR Field Descriptions 30.3.3.29 FEC Transmit FIFO Last Read Frame Pointer Register (FECTLRFP) 30.3.3.30 FEC Transmit FIFO Last Write Frame Pointer Register (FECTLWFP) 30.3.3.31 FEC Transmit FIFO Alarm Register (FECTFAR) Figure 30-34. FEC Transmit FIFO Alarm Register (FECTFAR) 30.3.3.32 FEC Transmit FIFO Read Pointer Register (FECTFRP) 30.3.3.33 FEC Transmit FIFO Write Pointer Register (FECTFWP) 30.3.3.34 FEC FIFO Reset Register (FECFRST) Figure 30-37. FEC FIFO Reset Register (FECFRST) 30.3.3.35 FEC CRC and Transmit Frame Control Word Register (FECCTCWR) Table 30-41. FECFRST Field Descriptions 30.4 Functional Description 30.4.1 Initialization Sequence 30.4.1.1 Hardware Controlled Initialization 30.4.1.2 User Initialization (Prior to Asserting ECR[ETHER_EN]) 30.4.2 Frame Control/Status Words Figure 30-39 defines the format for the receive frame status word. 30.4.2.1 Receive Frame Status Word (RFSW) Figure 30-39. Receive Frame Status Word Format (RFSW) Table 30-45. RFSW Field Descriptions Table 30-44. User Initialization (Before Asserting ECR[ETHER_EN]) (Continued) 30.4.2.2 Transmit Frame Control Word (TFCW) Figure 30-40 shows the format of the transmit frame control word. Figure 30-40. Transmit Frame Control Word Format (TFCW) Table 30-46. TFCW Field Descriptions Table 30-45. RFSW Field Descriptions (Continued) 30.4.3 Network Interface Options 30.4.4 FEC Frame Transmission 30.4.5 FEC Frame Reception 30.4.6 Ethernet Address Recognition 30.4.7 Hash Algorithm Eqn. 30-1 Table 30-49. Destination Address to 6-Bit Hash Table 30-49. Destination Address to 6-Bit Hash (Continued) 30.4.8 Full Duplex Flow Control 30.4.9 Inter-Packet Gap (IPG) Time 30.4.10 Collision Handling 30.4.11 Internal and External Loopback 30.4.12 Ethernet Error-Handling Procedure 30.4.12.1 Transmission Errors 30.4.12.2 Reception Errors 30.4.13 MII Data Frame 30.4.14 MII Management Frame Structure Table 30-52. MII Management Register Set (Continued) Page Page Page Chapter 31 Mechanical Data 31.1 Package The MCF548x is assembled in a 388-pin, thermally enhanced plastic BGA package. 31.2 Pinout Table 31-1. MCF5485/MCF5484 Signal Description by Pin Number Page Page Page Page Page Page 31.3 Mechanical Diagrams 31.3.1 MCF5485/5484 Mechanical Diagram Figure 31-1. MCF5485/5484 Upper Left Quadrant Pinout (388 PBGA) Figure 31-2 shows the pinout for the upper right quadrant of the MCF5485/MCF5484 pinout for the 388 Figure 31-2. MCF5485/5484 Upper Right Quadrant Pinout (388 PBGA) Figure 31-3 shows the pinout for the lower left quadrant of the MCF5485/MCF5484 pinout for the 388 Figure 31-3. MCF5485/5484 Lower Left Quadrant Pinout (388 PBGA) Figure 31-4 shows the pinout for the lower left quadrant of the MCF5485/MCF5484 pinout for the 388 Figure 31-4. MCF5485/5484 Lower Right Quadrant Pinout (388 PBGA) 31.3.2 MCF5483/5482 Mechanical Diagram Figure 31-5. MCF5483/5482 Upper Left Quadrant Pinout (388 PBGA) Figure 31-6 shows the pinout for the upper right quadrant of the MCF5483/MCF5482 pinout for the 388 Figure 31-6. MCF5483/5482 Upper Right Quadrant Pinout (388 PBGA) Figure 31-7 shows the pinout for the lower left quadrant of the MCF5483/MCF5482 pinout for the 388 Figure 31-7. MCF5483/5482 Lower Left Quadrant Pinout (388 PBGA) Figure 31-8 shows the pinout for the lower left quadrant of the MCF5483/MCF5482 pinout for the 388 Figure 31-8. MCF5483/5482 Lower Right Quadrant Pinout (388 PBGA) 31.4 MCF5481/5480 Mechanical Diagram Figure 31-9. MCF5481/5480 Upper Left Quadrant Pinout (388 PBGA) Figure 31-10 shows the pinout for the upper right quadrant of the MCF5481/MCF5480 pinout for the 388 Figure 31-10. MCF5481/5480 Upper Right Quadrant Pinout (388 PBGA) Figure 31-11 shows the pinout for the lower left quadrant of the MCF5481/MCF5480 pinout for the 388 Figure 31-11. MCF5481/5480 Lower Left Quadrant Pinout (388 PBGA) Figure 31-12 shows the pinout for the lower left quadrant of the MCF5481/MCF5480 pinout for the 388 Figure 31-12. MCF5485/5484 Lower Right Quadrant Pinout (388 PBGA) Page Appendix A MCF548x Memory Map Table A-1 lists an overview of the memory map for the on-chip modules. Table A-1. MCF548x Module Memory Map Overview Table A-1. MCF548x Module Memory Map Overview (continued) Page Page Index

Freescale Semiconductor 16.2.3 Transfer Count Configuration RegisterDMA Read Channel (TCCRDR)

Models: MCF5480 MCF5481 MCF5482 MCF5483 MCF5484 MCF5485

16.2.3 Transfer Count Configuration Register—DMA Read Channel

(TCCRDR)

This register is used to configure the allocated maximum transfer count for each bank for the DMA read

channel as it accesses SRAM directly, without going through the system bus.

Figure 16-4. Transfer Count Configuration Register—DMA Read Channel (TCCRDR)

Table 16-4. TCCRDR Register Field Descriptions