Sources of Local Bus Errors, Local Bus Timeout | Motorola MVME1X7P

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Programming Issues

Sources of Local Bus Errors

A TEA* signal (indicating a bus error) is returned to the Local Bus master when a Local Bus time-out occurs, a DRAM parity error occurs and parity checking is enabled, or a VME bus error occurs during a VMEbus access.

The sources of Local Bus errors on the Single Board Computers are described in the next subsections.

Local Bus Timeout

A Local Bus Timeout occurs whenever a Local Bus cycle does not complete within the programmed time (VMEbus bound cycles are not timed by the Local Bus timer). If the system is configured properly, this should only happen if software accesses a non-existent location within the onboard address range.

VMEbus Access Timeout

A VMEbus Access Timeout occurs whenever a VMEbus bound transfer does not receive a VMEbus bus grant within the programmed time. This is usually caused by another bus master holding the bus for an excessive period of time.

VMEbus BERR*

A VMEbus BERR∗ occurs when the BERR∗ signal line is asserted on the VMEbus while a Local Bus master is accessing the VMEbus. VMEbus BERR∗ should occur only if one of the following events is detected:

❏An initialization routine samples to see if a device is present on the VMEbus and it is not.

❏Software accesses a nonexistent device within the VMEbus range.

❏Erroneous configuration data causes the VMEchip2 to incorrectly access a device on the VMEbus (such as driving LWORD∗ low to

a 16-bit board).

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Motorola MVME1X7P manual Sources of Local Bus Errors, Local Bus Timeout, VMEbus Access Timeout, VMEbus Berr, Bit board

Contents

Programmer’s Reference Guide MVME1X7P Single-Board ComputerPage Safety Summary Flammability CE Notice European Community Limited and Restricted Rights Legend Contents Viii VMEchip2 Page Page PCCchip2 Xiii Chapter Appendix a Summary of Changes Xvi List of Figures Xviii List of Tables Page Model Number Characteristics About This Manual Overview of Contents Comments and Suggestions Conventions Used in This Manual CR represents the carriage return or Enter key Ctrl Xxv Xxvi Introduction Petra Asic and Second-Generation MVME1X7 Boards Programming Issues Feature FeaturesMVME1X7P Features Summary Block Diagram Applicable Industry Standards MVME167P Block Diagram MVME177P Block Diagram Programming Interfaces Data Bus Structure EEPROMs on the MVME1X7P Model Sockets Banks Flash Memory on the MVME177 MVME177 Sram Onboard Sdram Interfaces Battery-Backed-Up RAM and ClockVMEbus Interface Serial Port Interface Parallel Printer Interface Ethernet Interface Scsi Interface Programmable Tick TimersLocal Resources Watchdog Timer Local Bus TimeoutFunctional Description Software-Programmable Hardware Interrupts Petra/VMEchip2 Redundant Logic VMEbus Interface and VMEchip2VMEchip2 General-Purpose I/O Functions Duplicated in VMEchip2 and Petra ASICs VMEchip2 Petra Chip Address Bit # Normal Address Range Memory MapsLocal Bus Memory Map Local Bus Memory Map Address Range Devices Accessed Port Size Local I/O Devices Memory Map 3KB Programming Issues Detailed I/O Memory Maps Tables 1-5 through 1-14 give the detailed memory maps for VMEchip2 Memory Map Sheet 1 Offset This sheet begins on facing VMEchip2 Memory Map Sheet 2 PRE Compare Register Counter Overflow VMEchip2 Memory Map Sheet 3 Offsets Bit Numbers Printer Memory Map PCCchip2 Memory Map SCC Transmit Piack Vector Base Register Mcecc Internal Register Memory Map Mcecc Base Address = $FFF43000 1st $FFF43100 2ndRegister Bit Names D31 D30 D29 D28 D27 D26 D25 D24 Register Register Bit Names Cirrus Logic CD2401 Serial Port Memory Map Option Registers Receive Interrupt Registers Channel Command and Status RegistersInterrupt Registers Transmit Interrupt Registers Modem Interrupt RegistersDMA Registers DMA Receive Registers Timer Registers DMA Transmit Registers 10 CA Ethernet LAN Memory Map 11 C710 Scsi Memory Map BBRAM/TOD Clock Memory Map Address Range Description Size Bytes 13. Bbram Configuration Area Memory Map12. M48T58 BBRAM,TOD Clock Memory Map 14. TOD Clock Memory Map Address Data Bits Function MVME167P-24SE 01-W3620F35C VMEbus Accesses to the Local Bus VMEbus Memory MapInterrupt Acknowledge Map VMEbus Short I/O Memory Map Example VMEchip2 Tick Timer 1 Periodic Interrupt Interrupt Handling To the Tick Timer 1 Compare Register description Cache Coherency MVME167P Cache Coherency MVME177P Using Bus Timers Instructions Indivisible Cycles15. Single-Cycle Instructions Supervisor Stack Pointer MC68060 Sources of Local Bus Errors Local Bus TimeoutVMEbus Access Timeout VMEbus Berr VMEchip2 Error ConditionsBus Error Processing MPU TEA Cause Unidentified MPU Parity ErrorMPU Offboard Error MPU Local Bus Time-out Dmac VMEbus ErrorDmac Parity Error Dmac Offboard Error Dmac LTO Error SCC Retry Error Dmac TEA Cause Unidentified SCC Parity Error SCC Offboard Error LAN Offboard Error SCC LTO ErrorLAN Parity Error Scsi Offboard Error LAN LTO ErrorScsi Parity Error Scsi LTO Error Programming Issues Computer Group Literature Center Web Site Features of the VMEchip2 Asic Function Features VMEchip2 Introduction Functional Blocks Local-Bus-to-VMEbus Interface VMEchip2 Block Diagram VMEchip2 Local-Bus-to-VMEbus Requester VMEchip2 VMEbus-to-Local-Bus Interface Functional Blocks Local-Bus-to-VMEbus DMA Controller Functional Blocks No-Address-Increment DMA Transfers Dmac VMEbus Requester Tick and Watchdog Timers Prescaler Tick Timers VMEbus Interrupter Bus Timer VMEbus System ControllerArbiter Iack Daisy-Chain Driver Reset Driver Local Bus Interrupter and Interrupt HandlerDmac done VMEbus Sysfail interrupter Functional Blocks Lcsr Programming Model Global Control and Status Registers State of the bit following a reset, defined as follows 2shows a summary of the LCSRs VMEchip2 Memory Map-LCSR Summary Sheet 1 IO2 IO1 VMEchip2 Memory Map-LCSR Summary Sheet 2 IRQ7 IRQ6 IRQ5 Programming the VMEbus Slave Map Decoders Lcsr Programming Model VMEbus Slave Ending Address Register VMEbus Slave Starting Address Register Local-bus map decoder VMEbus Slave Address Translation Address Offset Register VMEbus Slave Address Translation Select Register Segment Address Translation Size Select Value $FFF4000C 16 bits SNP2 VMEbus Slave Write Post and Snoop Control RegisterWP2 VMEbus Slave Address Modifier Select Register DATPGM BLK USR SUP WP1 SNP1 When this bit is high, the first map decoder responds to Block access cyclesA24 access cycles Cycles A32 access cycles VMEbus supervisory access cycles. When this bit is lowProgramming the Local-Bus-to-VMEbus Map Decoders Bit is low, the first map decoder does not respond to VMEchip2 Local Bus Slave VMEbus Master Ending Address Register Local Bus Slave VMEbus Master Starting Address Register $FFF4001C 16 bits $FFF40024 16 bits Local Bus Slave VMEbus Master Attribute Register Segment defined by map decoder 3. When this bit is Decoder 3. Because the local-bus-to-VMEbus interface Not support block transfers, the block transfer address Segment defined by map decoder 2. When this bit isDecoder 2. Since the local-bus-to-VMEbus interface does Segment defined by map decoder 1. When this bit is Decoder 1. Because the local-bus-to-VMEbus interface VMEbus Slave Gcsr Group Address Register VMEbus Slave Gcsr Board Address Register Local-Bus-to-VMEbus Enable Control Register EN1EN2 EN3 Local-Bus-to-VMEbus I/O Control Register Programming the VMEchip2 DMA Controller I2WPI2EN ROM Control Register VMEchip2 Dmac Command Packet Format Dmac RegistersEprom Decoder, Sram and DMA Control Register Entry Function Tblsc ROM0 Lvrwd LvfairDWB DHB Drelm DfairDtbl DEN Dmac Control Register 2 bits TvmeLinc Vinc This bit is used only in command chaining mode. It is only Modified when the Dmac loads the control register fromControl word in the command packet. When this bit SNP Dmac Local Bus Address Counter Dmac VMEbus Address Counter Dmac Byte CounterTable Address Counter Dmac VMEbus Address Counter VMEbus Interrupter Control Register IrqlIrqs Irqc VMEbus Interrupter Vector Register MPU Status and DMA Interrupt Count Register Dmac Status Register Programming the Tick and Watchdog Timers VMEbus Arbiter Time-Out Control Register Vgto Time on Lbto Vato Prescaler Control Register Prescaler register = 256- Bclock MHz Tick Timer 1 Compare Register Tick Timer 1 Counter Tick timer 2 Counter Tick Timer 2 Compare RegisterTick Timer 2 Counter Board Control Register WDS/L Watchdog Timer Control RegisterWden Tick Timer 2 Control Register Tick Timer 1 Control Register Prescaler Counter Programming the Local Bus Interrupter Local Bus Interrupter Summary Interrupt Vector Priority for Simultaneous Interrupts Dmac Local Bus Interrupter Status Register bits LM0 LM1SIG0 SIG1 SW0 SW1SW2 SW3 VME1 VME2VME3 VME4 Local Bus Interrupter Enable Register bits ELM0 ELM1ESIG0 ESIG1 ESW0 ESW1ESW2 ESW3 EIRQ1 EIRQ2EIRQ3 EIRQ4 Software Interrupt Set Register bits Interrupt Clear Register bits Interrupt Level Register 1 bits IRQ1E Level Interrupt Level Register 2 bits These bits define the level of the tick timer 1 interruptThese bits define the level of the tick timer 2 interrupt SIG3 Level SIG2 Level Interrupt Level Register 3 bits SW5 Level SW4 Level Interrupt Level Register 4 bits VIRQ7 LevelThese bits define the level of the VMEbus IRQ7 interrupt Spare Level Interrupts may be mapped to any local bus interrupt level VIRQ3 LevelThese bits define the level of the VMEbus IRQ3 interrupt VIRQ4 Level VBR VIRQ1 LevelVIRQ2 Level Control Register Connects to pin 16 of the Remote Status and Control Connects to pin 17 of the Remote Status and ControlConnects to pin 18 of the Remote Status and Control Not used Miscellaneous Control Register Enint Lcsr Programming Model Gcsr Programming Model 101 Programming the Gcsr 5shows a summary of the Gcsr VMEchip2 Memory Map Gcsr SummaryVMEchip2 Revision Register Offsets Bit Numbers Loca VMEchip2 ID Register VMEchip2 LM/SIG Register LM2 LM3 RST VMEchip2 Board Status/Control RegisterISF General Purpose Register Local Bus $FFF40114/VMEbus $XXYA 16 bits Summary of Major Features PCCchip2 PCCchip2 Block Diagram General Description MPU Port and MPU Channel Attention Bbram Interface82596CA LAN Controller Interface Lanc Bus Error MC68040-Bus Master Support for 82596CA Lanc Interrupt 53C710 Scsi Controller Interface Parallel Port Interface General Purpose I/O Pin CD2401 SCC Interface PCCchip2 Tick Timer Address Range Selected Device Comments Overall Memory MapPCCchip2 Devices Memory Map Programming Model Summary of the PCCchip2 CSR is shown in Table PCCchip2 Memory Map Control and Status Registers Fast Chip ID Register Chip Revision Register General Control Register Fast Vector Base Register DR0 Interrupt Source IV3-IV0 Priority Gpio IRQ Programming the Tick Timers Tick Timer 2 Compare Register Prescaler Clock Adjust Register Prescaler Count Register Prescaler clock adjust register = 256 Bclk MHz CEN Clear On Compare. When this bit is high, the counter isWhen this bit is low, the counter is not reset $FFF42017 8 bits General Purpose Input Interrupt Control Register IclrIEN INT Tick Timer 2 Interrupt Control Register General Purpose Input/Output Pin Control RegisterGPO Gpoe Cleared by writing a logic 1 into the Iclr control bit Interrupt Status. When this bit is high a Tick TimerInterrupt is being generated at the level programmed SCC Error Status and Interrupt Control Registers SCC Error Status RegisterSCL R Writing a 1 to this bit clears bits 25 through 28 LTO IRQ SCC Modem Interrupt Control RegisterAvec SCC Transmit Interrupt Control Register SCC Receive Interrupt Control Register Modem Piack Register Transmit Piack Register Receive Piack Register Lanc Error Status and Interrupt Control Registers Lanc Error Status RegisterSclr Writing a 1 to this bit clears bits 25 through 27 LTO Lanc qualified by the IEN bit. When this bit is high, a 82596CA Lanc Interrupt Control RegisterInterrupt level for the 82596CA LANC. Level 0 does not This status bit reflects the state of the INT pin from Lanc Bus Error Interrupt Control Register SC0 pins, when the 82596CA Lanc performsInterrupt level. Level 0 does not generate an interrupt IL2-IL0 if nonzero Programming the Scsi Error Status and Interrupt Registers Scsi Error Status Register Scsi Interrupt Control Register Interrupt level for the Scsi Processor. Level 0 does not IL2-IL0 Programming the Printer PortPrinter ACK Interrupt Control Register When this bit is high, a printer Fault interrupt is being Printer Fault Interrupt Control RegisterFAULT. Level 0 does not generate an interrupt SEL. Level 0 does not generate an interrupt When this bit is high, a printer SEL interrupt is beingPrinter SEL Interrupt Control Register PE. Level 0 does not generate an interrupt When this bit is high, a printer PE interrupt is beingPrinter PE Interrupt Control Register BUSY. Level 0 does not generate an interrupt When this bit is high, a printer Busy interrupt is beingPrinter Busy Interrupt Control Register Printer Input Status Register STB Printer Port Control RegisterMAN Chip Speed Register INPDoen Printer Data Register Interrupt Priority Level Register Priority Level Comments Interrupt Mask Level Register MSK2 MSK1 MSK0 PCCchip2 Computer Group Literature Center Web Site Mcecc Functions Mcecc Functions on the Petra Asic FeaturesMcecc functions now implemented on the Petra chip include Performance Cache Coherency Memory System Cycle Timing Cycle Types Error ReportingSingle Bit Error Cycle Type = Burst Read or Non-Burst Read Double Bit Error Cycle Type = Burst Read or Non-Burst Read Single Bit Error Cycle Type = Non-Burst WriteDouble Bit Error Cycle Type = Non-Burst Write Cycle Type = Burst Write Triple or Greater Bit Error Cycle Type = Non-Burst Write Single Bit Error Cycle Type = ScrubDouble Bit Error Cycle Type = Scrub Triple or Greater Bit Error Cycle Type = Scrub Refresh Error LoggingScrub Chip Defaults Arbitration Programming Model Mcecc Sector Internal Register Memory Map Name D31 D30 D29 D28 D27 D26 D25 D24 RWB7 RWB6 1st $FFF43000/2nd $FFF43100 8-bits Memory Size Memory Configuration RegisterMSIZ2-MSIZ0 Bit assignments for the Dram Control register are Base Address RegisterDram Control Register Bclk Frequency Register Unchanged by software or local reset Data Control Register Mcecc Functions Scrub Control Register RWB0 RWB0 is a general-purpose read/write bit Scrub Period Register Bits This register contains bits 7-0 of the Scrub Period register STOFF2-STOFF0 Chip Prescaler CounterScrub Time On/Time Off Register Scrubber Time On STON2-STON0Scrubber Time Off Scrub Prescaler Counter Bits Scrub Timer Counter Bits Scrub Address Counter Bits 1st $FFF43050/2nd $FFF43150 8-bits Error Logger Register Error Address Bits 1st $FFF43068/2nd $FFF43168 8-bits RSIZ2-RSIZ0 Error Syndrome RegisterDefaults Register SELI1, SELI0 Dram Array Size RESST2-RESST0 Sdram Configuration Register SDCFG2-SDCFG0 Initialization Programming Model Syndrome Decoding Syndrome Bit Encoding Identifying Sdram Bank in Error Error Mcecc Functions Computer Group Literature Center Web Site Table A-1. List of Changes Function Previous Implementation MVME1x2P2 Implementation Summary of Changes Computer Group Literature Center Web Site Connection Diagrams Name Number Figure B-1. MVME1X7P Printer Port with MVME712M Figure B-2. MVME1X7P Serial Port 1 Configured as DCE Figure B-3. MVME1X7P Serial Port 2 Configured as DCE Figure B-4. MVME1X7P Serial Port 3 Configured as DCE Figure B-5. MVME1X7P Serial Port 4 Configured as DCE Figure B-6. MVME1X7P Serial Port 1 Configured as DTE Figure B-7. MVME1X7P Serial Port 2 Configured as DTE Figure B-8. MVME1X7P Serial Port 3 Configured as DTE Figure B-9. MVME1X7P Serial Port 4 Configured as DTE Document Title Motorola Publication Number MCG DocumentsTable C-1. Motorola Computer Group Documents Document Title and Source Publication Number Manufacturers’ DocumentsTable C-2. Manufacturers’ Documents Publication Document Title and Source Number Related SpecificationsTable C-3. Related Specifications IEC 821 BUS Index Bbram 10,2-51 Gcsr IN-5 LAN IN-7 MVME1X7P IN-9 SCC Scsi IN-12 Enabling 2-32,2-35,2-43,2-44,2-50,2-51 Index