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Emerson MVME147 manual where n = number of blocks or filemarks to Space

Models: MVME147

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SCSI Bus Reset Packet Command Table Phase Recover Buffer Data Packet Features TARGET Enable Custom Packet

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Emerson MVME147 manual where n = number of blocks or filemarks to Space

Page 126 Page 128

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Contents

Modes of Operation FeaturesGENERAL INFORMATION Introduction MVME147 SCSI Firmware Entry Points The SCSI firmware initializes these vectors Equipment Supported CONTROLLE PART Devices Supported Under Common Command Set PUBLICATION NUMBER Related DocumentationMOTOROLA DOCUMENT TITLE Manual Terminology GENERAL INFORMATION Initiator Role Custom Packet CUSTOM SCSI PACKETS CUSTOM SCSI PACKETS Initiator Role Custom Packet Page PHASE CODE Initiator Role Custom Packet +$00 +$68 status Note ASYNC the firmware status xxxxxxxx xxxxxxxx Page CUSTOM SCSI PACKETS Initiator Role Custom Packet CUSTOM SCSI PACKETS TARGET Enable Custom Packet TARGET Enable Custom Packet Status from SCSI NOTES TARGET Enable Custom Packet TARGET Sequence Custom Packet TARGET Sequence Custom Packet NOTES TARGET Sequence Custom Packet WORDS $04 and $06 CUSTOM SCSI PACKETS TARGET Sequence Custom Packet CUSTOM SCSI PACKETS RETRY COUNT. Not used by the TARGET role firmware CUSTOM SCSI PACKETS Packet Return Status PACKET RETURN STATUSControl Flags SCSI Packet Return Status Bit 2 EOM End of media Bit 3 FM Filemark Bit 4 COMMAND RETRY1 = Retries were performed Bit 5 COMMAND RE The command was retried retry count times PACKET RETURN STATUS MEANING Table 3-1.Packet Status CodesIntermediate Return Codes Final Return Codes SCSI Bus Reset Packet section in Chapter Table 3-2.Packet Status Codes cont’d Table 3-3.Packet Status Codes cont’d Request-Sense-Data Error-Class7 CodesController-Dependent Table 3-4.Packet Status Codes cont’d SCSI Status Returned in Status Phase Table 3-5.Packet Status Codes cont’d Request-Sense-Data Error-Class0 through 6 CodesPage PACKET RETURN STATUS SCSI Firmware Interrupt Structure SCSI FIRMWARE INTERRUPT STRUCTURE SCSI FIRMWARE INTERRUPT STRUCTURE SCSI_INT WRITING A DRIVERSCSI_CMD SCSI ACTV Figure 5-1.SCSI Disk Driver Interface to VERSAdos Passing Commands to the SCSI FirmwareBuilding the Packet Interface Rules for the SCSI Firmware Interface Rules for Multiple Callers WRITING A DRIVER Care must be taken not to modify the contents of WRITING A DRIVER Interface Rules for the SCSI Firmware FUNNEL WRITING A DRIVER Interface Rules for the SCSI Firmware WRITING A DRIVER MOVE.W 2A2,D0 THE CODE BELOW HANDLES FINAL RETURN CODES Interface Rules for a Single Caller WRITING A DRIVER MVME147 SCSI Firmware Background TARGET ROLE ROUTINES Custom Sequence Packet SCSI Versus SASI Rules Script Command Table Enabling TARGET Role Enabling TARGET Role Servicing the TARGET Requests Servicing the TARGET Requests TARGET ROLE ROUTINES Servicing the TARGET Requests TARGET ROLE ROUTINES Servicing the TARGET Requests TARGET ROLE ROUTINES DESCRIPTION SCSI PACKETSTable 7-1.SCSI Functions FUNCTION CODE Table Read/Write PacketSCSI Functions cont’d DISK and TAPE Controller logical unit in SG table, if zero Old Packet Supported for Compatibility +$12 in SG table, if zero DMA MEMORY ADDRESS 32-BIT DMA Scatter/Gather Table Entry|function code 3 bits 1 = link to next entryFor example $5 is CONTROLLER COMMANDAttach/Detach Packet all devices COMMAND Attach/Detach Packet all devices SCSI PACKETS +$1E FM encoding, single Controller type refer xxxxxxxx attributes byte offset +$20 Single track density Drive type 0 = 3½, 5¼ Example for floppy3½, 5¼, 250K B/S Data +$04 Minimum read QIC-24 if this is set to 0, the +$00 Reserved Interrupt level +$00 +$9E $00 Format Packet Assign Alternate Sector Packet SCSI +$0E Assign Alternate Sector Packet SCSI DEFECT LIST TYPE 0 Note 3, Head Bytes from Index MSW Note SCSI Bus Reset Packet Controller logical unit Erase Packet SCSI Controller Reset Packet +$12 Rewind Packet Device logical unit Read Block Limits Packet SCSI PACKETS where n = number of blocks or filemarks to Space Status from SCSI Write Filemarks Packet Write Filemarks PacketThe table below shows the write filemarks packet Controller logical unit The controller must be in general or read mode Verify CRC Packet Tape Mode Select/Sense Packet Tape Mode Select/Sense Packet Number of tracks on Inquiry Packet +$00 Reserved +$1A Load/Unload Packet +$14 Recover Buffer Data Packet +$0C Request Sense Data Packet Controller logical unit Check Status Packet Open Packet Open Packet SCSI PACKETS BYTE OFFSET COMMON COMMAND SET AND DISK OPERATIONBYTE BYTE OFFSET ENTRY NUMBER NOTES Send mode select command COMMON COMMAND SET AND DISK OPERATION DEFECT LIST TYPE DEFECT LISTFORMAT BITS Mode Select Header Block Descriptor BYTE OFFSET COMMON COMMAND SET AND DISK OPERATION BYTE OFFSET BYTE OFFSETMode Select Header Block Descriptor VALUE BYTE OFFSETBYTE OFFSET NOTES COMMENTS Mode Select Command CDBBYTE OFFSET VALUE Block Descriptor COMMON COMMAND SET AND DISK OPERATIONBYTE OFFSET Mode Select Header BYTE OFFSET BYTE OFFSETPage code NOTES ALL SECTORS ATTRIBUTE FLAGSMEDIA TYPE TYPE COMMON COMMAND SET AND DISK OPERATIONATTRIBUTE FLAGS MEDIA VALUE PIN 2 CONTROL PIN 34 CONTROLPin 2 and Pin 34 Definition for High Density Pin 2 and Pin 34 Definition for Low Density Pin 34 = drive A-22

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