Endian Issues, Big-Endian Mode | Motorola MVME2300 Series manual

Endian Issues

Endian Issues

The MVME2300 series supports both little-endian and big-endian software. Because the PowerPC processor is inherently big-endian, PCI is inherently little-endian, and the VMEbus is big-endian, there is potential for confusion. The figures below illustrate how the MVME2300 series boards handle the endian issue in big-endian and little-endian modes.

Big-Endian PROGRAM

5

Falcons

60X System Bus

Raven

N-way Byte Swap

PCI Local Bus

Universe

N-way Byte Swap

DRAM

Big-Endian

Little-Endian

Little-Endian

Big-Endian

VMEbus

1898 9609

Figure 5-3. Big-Endian Mode

http://www.motorola.com/computer/literature

5-11

Image 255

Motorola MVME2300 Series manual Endian Issues, Big-Endian Mode

Contents

MVME2300 Series VME Processor Module Programmer’s Reference GuidePage Safety Summary Instructions Flammability CE Notice European Community Limited and Restricted Rights Legend Contents Raven PCI Bridge Asic Page Page Falcon ECC Memory Controller Chip Set Universe VMEbus to PCI Chip Chapter Page List of Figures Page List of Tables Xviii 64MB ECC Dram Model Memory Processor16MB ECC Dram 32MB ECC Dram Date Description of Change Summary of Changes Comments and Suggestions Overview of Contents Ctrl Conventions Used in This ManualBold Enter, Return or CR Xxiii Xxiv Overview Introduction ECC Dram Summary of FeaturesFeatures MVME2300 Series Feature MVME2300 Scsa I/O System Block Diagram Board Description and Memory Maps MVME2300 Series System Block Diagram Functional Description VMEbus InterfaceFront Panel P2 I/O Programming ModelPCI interface Processor Memory Maps Processor Address Size Definition Start End Default Processor Memory Map Chrp Memory Map Example Processor Chrp Memory Map Address Register Name Register Value Raven MPC Register Values for Chrp Memory Map Processor Prep Memory Map Prep Memory Map ExampleBfff Ffff Raven MPC Register Values for Prep Memory Map PCI Configuration Access PCI Address Size Definition Start End Default PCI Memory MapPCI Memory Maps PCI Chrp Memory Map FC03 Ffff Configuration Register Value Address Offset Register Name Raven PCI Register Values for Chrp Memory MapUniverse PCI Register Values for Chrp Memory Map 10. PCI Prep Memory Map PCI Prep Memory Map 3AFE Ffff 38FF Ffff39FE Ffff 39FF Ffff 11. Raven PCI Register Values for Prep Memory Map 12. Universe PCI Register Values for Prep Memory Map VMEbus Master Map VMEbus Mapping VMEbus Slave Map VMEbus Slave Mapping VSI0TO VSI0CTLVSI0BS VSI0BD 15. System Register Summary VMEbus Address Size Chrp Map Prep Map Range ModeFalcon-Controlled System Registers 14. VMEbus Slave Map Example Sysclk Value System Clock Speed PCI Clock Speed System Configuration Register SyscrSystem Configuration Register $FEF80400 $FD P0/1STAT Value Processor 0/1 Present External In-line Cache MSIZE01 Total Memory On Board Memory Configuration Register MemcrMemory Configuration Register $FEF80404 MSIZE01 MSPD01 RA/BTYP02L2TYPE03 PLL Value Size L2PLL03FLSHP02 System External Cache Control Register Sxccr CPU Control Register $FEF88300 Processor 0 External Cache Control Register P0XCCRProcessor 1 External Cache Control Register P1XCCR CPU Control Register Uart Access RegistersISA Local Resource Bus W83C553 PIB Registers General-Purpose Readable Jumpers NVRAM/RTC and Watchdog Timer Registers PCI I/O Address Function Module Configuration and Status Registers17. M48T59/559 Access Registers 18. Module Configuration and Status Registers SD7 SD6 SD5 SD4 SD3 SD2 SD1 SD0 CPU Configuration RegisterOld CPU Configuration Register $FE000800 Cputype Base Module Feature Register Base Module Feature Register Offset $0802Pcixp PMC2P PMC1P Vmep Lanp Basetype Base Module Status Register BmsrBasetype Base Module Status Register Offset $0803 SD9 SD8 SD7 SD6 SD5 SD4 SD3 SD2 SD1 SD0 VME RegistersSeven-Segment Display Register Segment Display Register Offset $08C0 SETSIG0 19. VME RegistersLM/SIG Control Register SETSIG1 LM/SIG Status Register Board Description and Memory Maps Location Monitor Lower Base Address Register Offset $1003 Location Monitor Upper Base Address RegisterLocation Monitor Lower Base Address Register Location Monitor Upper Base Address Register Offset $1002 Semaphore Register 2 Offset $1005 Semaphore RegisterSemaphore Register 1 Offset $1004 SEM1 Emulated Z8536 Registers Emulated Z8536 CIO Registers and Port Pins20. Emulated Z8536 Access Registers VME Geographical Address Register Vgar Z8536 CIO Port Pins Port Signal Direction Descriptions Pin Name21. Z8536 CIO Port Pin Assignments ISA DMA Channels PC2 BASETYP0PC3 BASETYP1 Page Features Features of the Raven AsicFunction Features Block Diagram Raven Block Diagram MPC Address Mapping MPC Bus Interface MPC-to-PCI Address Decoding MPC Slave MPC to PCI Address Translation MPC Transfer Type Transaction Encoding Command Types MPC Slave Response MPC Master MPC Write Posting PCI Command Code MPC Transfer TypesMPC Transfer Type MPC Transfer Size TT0-TT4 MPC Arbiter MPC Bus Timer PCI Address Mapping Configuration Registers PCI to MPC Address Decoding MPC Bus Address Space Decoder Priority RavenMPIC Control Registers PCI Slave Addressing Command TypesCommand Types PCI Slave Response Command Type Slave Response? Fast Back-to-Back Transactions Exclusive AccessDevice Selection Target-Initiated Termination PCI Master ParityCache Support PCI Write Posting Transfer Type PCI Master Command CodesPCI Command Entity Addressed Master Initiated Termination Combining, Merging, and Collapsing Arbitration Arbitration LatencyAddress/Data Stepping Generating PCI Cycles Generating PCI Memory and I/O CyclesPCI Cycle Type PCI Spread I/O Address Translation Generating PCI Configuration Cycles Functional Description Device Number Address Bit Generating PCI Special Cycles When MPC Devices are Big-Endian Endian ConversionGenerating PCI Interrupt Acknowledge Cycles Big- to Little-Endian Data Swap Data Address Length Bytes Modification When MPC Devices are Little-EndianRaven Registers and Endian Mode Address Modification for Little-Endian Transfers Error Handling Perr Error Status Error Address AttributesTransaction Ordering SMA MPC Registers Raven Registers Raven MPC Register Map Vendor ID/Device ID Registers VenidDevid Revision ID. Identifies the Raven revision level. This General Control-Status/Feature RegistersRevision ID Register Revid Mpic FlbrdBhog Marb MIDx FeatCurrent MPC Data Bus Master MPC Arbiter Control Register Prescaler Adjust RegisterOperation Reset $00 Operation Reset $00 $B4 Matom MPC Error Enable Register Perri SmamRtam Matoi MPC Error Status Register OVFMato RTA Writing it to a 0 has no effect. When the Smam bitSMA PCI transaction. The bit may be cleared by writing it to a TTx MPC Error Attribute Register MeratWhich originated the transfer in which the error occurred Register Designates a selected byte Address $FEFF0030 Bit Name Operation Reset $0000PCI Interrupt Acknowledge Register Piack MPC Slave Address 3 Register Operation Reset $8000 $8080Start END WEN MPC Slave Offset/Attribute 0,1 and 2 RegistersMSOFFx REN Wpen IOMMSOFF3 PCI Registers Cycles. When clear, the corresponding MPC slave will $8C Raven PCI Configuration Register Map$0C $18 $7F Offset $00 Bit Name Operation Reset $4801 $1057Raven PCI I/O Register Map $CF8 PCI Command/ Status Registers Rcvta DparSeltim Sigta Space Revision ID/ Class Code RegistersClass Base Register PRE RESIoba IO/MEM To access MPC bus resources. The value of this field will PCI Slave Address 0,1,2 and 3 RegistersBe compared with the upper 16 bits of the incoming PCI GBL PCI Slave Attribute/ Offset 0,1,2 and 3 RegistersINV Transfer type code which specifies the current transaction Configaddress Register Perspective from the MPC bus in Big-Endian modeConceptual perspective from the PCI bus DEV Perspective from the MPC bus in Little-Endian modeREG FUN EN Enable Configdata RegisterBUS Data ‘B’ Data ‘C’ Data ‘D’ Operation Reset Data ‘D’ Data ‘C’ Data ‘B’ Data ‘A’ Operation Reset Features Raven Interrupt ControllerArchitecture Readability of CSR Interrupt Source PriorityProcessor’s Current Task Priority Compatibility Nesting of Interrupt EventsSpurious Vector Generation Interprocessor Interrupts IPI Timers Raven-Detected Errors Interrupt Delivery Modes Raven Interrupt Controller Block Diagram Description Program-Visible Registers Interrupt Pending Register IPRInterrupt Selector is In-Service Register ISR Interrupt Request Register IRRInterrupt Router Raven PCI Bridge Asic Off Mpic RegistersRavenMPIC Registers 10. RavenMPIC Register Map $010E0 $010F0$011E0 $100F0 $100E0 $101F0 $101E0 Feature Reporting Register NcpuVID Offset $01020 Bit Name Global Configuration Register Processor Init Register Processor 1. Writing a 1 to P1 will assert the Soft ResetVendor Identification Register STP Prior IPI Vector/Priority RegistersMask ACT Offset $010E0 Bit Name Spurious Vector RegisterInterrupt Acknowledge register is read during a spurious Vector fetch Timer Base Count Registers Timer Current Count Registers Bit transitions from a 1 to a 0, the value is copied into Count Inhibit. Setting this bit to 1 inhibits counting forThis timer. Setting the bit to 0 allows counting to proceed Base Count. This field contains the 31-bit count for this Timer Destination Registers Sense Setting this bit to a 0 enables active low or negative edgeExternal Source Vector/Priority Registers POL External Source Destination Registers Offset $10200 Bit Name Raven-Detected Errors Vector/Priority Register Offset $10210 Bit Name Raven-Detected Errors Destination Register Offset Processor $20080 $21080 Bit Name End Of Interrupt. There is one EOI register per Zero is assumed. Writing to this register signals the endInterrupt Acknowledge Registers End-of-Interrupt Registers Programming Notes External Interrupt Service Reset State Interprocessor Interrupts Dynamically Changing I/O Interrupt Configuration Current Task Priority Level EOI RegisterInterrupt Acknowledge Register Mode Architectural Notes Page Dram Features of the Falcon Chip Set Falcon Pair Used with Dram in a System Block Diagrams Falcon Internal Data Paths Simplified Overall Dram Connections Bit Ordering Convention PerformanceFour-beat Reads/Writes Dram Speeds Single-beat Reads/Writes Beat PowerPC 60x Bus to Dram Access Timing 70ns Page DevicesClock Periods Required For Total Access Type 2nd 3rd 4th 2nd 3rd 4th Clocks Beat PowerPC 60x Bus to Dram Access Timing 60ns Page Devices PowerPC Bus to Dram Access Timing 50ns Hyper Devices ROM/Flash Speeds Cache Coherency PowerPC 60x Bus InterfaceResponding to Address Transfers Completing Data Transfers Cache Coherency Restrictions L2 Cache SupportCycle Types Single-Bit Error Reporting Error Logging Dram TesterROM/Flash Interface Functional Description $XXFFFFFB $7FFFFF $XXFFFFF8 $7FFFFC$XXFFFFF9 $7FFFFD $XXFFFFFA $7FFFFE $X3FFFFF3 $7FFFFE $X3FFFFF0 $7FFFFE$X3FFFFF1 $7FFFFE $X3FFFFF2 $7FFFFE Blocks a and/or B Present, Blocks C and D Not Present Refresh/Scrub Blocks a and/or B Present, Blocks C and/or D Present Dram Arbitration Chip Defaults CSR Accesses External Register SetCSR Architecture Data Path for Reads from the Falcon Internal CSRs Data Path for Writes to the Falcon Internal CSRs Memory Map for Byte Reads to CSR 1906 Memory Map for 4-Byte Reads to CSR Detailed Register Bit Descriptions Register Summary 10. Register Summary Test D3 Lower 32 Bits Programming Model Address $FEF80000 Bit Name Vendor/Device Register Read Zero Read only Revision ID/ General Control Register Ram spd0,ram spd1 11. ram spd1,ram spd0 and Dram TypeRam spd0, ram spd1 Dram Speed Dram Type Dram Attributes Register Ram a/b/c/d enRam a/b/c/d siz0-2 SIMM/DIMM BlockA/B/C/D ConfigurationsRam a/b/c/d Block Size Devices Used Technology Comments 0MB CLK Frequency Dram Base RegisterRAM A/B/C/D Base CLK Frequency Register Read Zero ECC Control RegisterRefdis Rwcb 11707.00 Falcon ECC Memory Controller Chip Set Mcken TienSien Mien Elog Embt Esen Address $FEF80038 Bit Name Error Address Register 13. rtest Encodings Rtest0,rtest1,rtest2 Test Mode selected Address $FEF80048 Bit Name Refresh/Scrub Address Register 1Mbyte of Block a also appears at $FFF00000 ROM a Base 1MB 14. ROM Block a Size Encoding15. romarv and rombrv Encoding Rom a siz Block Size Cycle Transfer Alignment Romx64 Romxwe Falcon Response 16. Read/Write to ROM/Flash ROM B Base/Size Register ROM B Base1Mbyte of Block B also appears at $FFF00000 Rom b siz Block Size 17. ROM Block B Size Encoding Has been programmed properly. Notice that CTR32 is Dram Tester Control RegistersBit Counter CTR32 is a 32-bit, free-running counter that increments Power-Up Reset Status Register Address $FEF80400 Bit NameAddress $FEF80500 Bit Name Address $FEF88000 $FEF8FFF8 Bit Name External Register Set Writing to the Control Registers Parity Checking on the PowerPC BusSoftware Considerations Programming ROM/Flash Devices Sizing Dram Software Considerations ROW 19. PowerPC 60x Address to Dram Address Mappings18. Sizing Addresses 1024MB 256MB 128MB 64MB 32MB 16MB 20. Syndrome Codes Ordered by Bit in Error ECC CodesBit Syndrome 20. Syndrome Codes Ordered by Bit in Error $AF $CF $EF 21. Single-Bit Errors Ordered by Syndrome Code Data Paths 10. PowerPC Data to Dram Data Correspondence 22. PowerPC Data to Dram Data Mapping Page Universe VMEbus to PCI Chip − BLT, ADOH, RMW, Lock Features of the Universe Asic Block Diagram Universe as VMEbus Slave Architectural Diagram for the Universe Universe as VMEbus Master PCI Bus Interface Universe as PCI Slave Universe as PCI Master Interrupter VMEbus Interrupt Handling DMA Controller Universe Control and Status Registers Ucsr Ucsr Access Mechanisms Universe Register Map Offset Register Name LSI3BS LSI2BSLSI2BD LSI2TO Linten DcppDgcs Dllue VSI2BS VSI0BD F0CVSI1BS F1C VSI2CTL F2C Description Universe Chip Problems after PCI Reset Method Workarounds Examples Example 1 MVME2600 Series Board Exhibits PCI Reset Problem Example 2 MVME3600 Series Board Acts Differently Run the init code and the LSI0 registers become Example 3 Universe Chip is Checked at Tundra Universe VMEbus to PCI Chip PIB PCI ArbitrationPCI Arbitration Assignments Pci Bus Request PCI Masters MVME2300 Series Interrupt Architecture Interrupt Handling Level RavenMPICRavenMPIC Interrupt Assignments Edge Polarity Interrupt Source Interrupts IRQ14IRQ15 PIB Interrupt Handler Block Diagram Edge PIB PCI/ISA Interrupt Assignments ISA DMA Channels Sources of Reset Reset switchExceptions Devices Affected Soft ResetReset Sources and Devices Affected Sources of Reset Error Notification and Handling Error Notification and HandlingCause Action Big-Endian Mode Endian Issues Little-Endian Mode PCI/Ethernet Processor/Memory DomainRole of the Raven Asic PCI Domain Role of the Universe Asic VMEbus DomainPCI-Graphics ROM/Flash Bank Default Default Mapping for FFF00000-FFFFFFFFROM/Flash Initialization Page Document Title Publication Number Motorola Computer Group Documents Document Title and Source Publication Number Manufacturers’ Documents EK-DE500-OM MPCFPE/AD Related Specifications ANSI/IEEEIEC 821 BUS MPR-PPC-RPU-02 IsbnTIA/EIA-232 Page Glossary O S S a R Y Enhanced Integrated Drive Electronics. An improved version PCI. Used in the reference platform specification. IBM IBM Computers developed by the IBM Corporation. PowerPC is Signal Computing System Architecture. a hardware model for See 10base-2 Page Index PCI 1-13 processor IN-3 PCI MPC IN-5 Configaddress 2-56CONFIGDATA IN-7 IN-8