Manuals / Emerson / Computer Equipment / Computer Hardware

Emerson MVME147 manual Enabling TARGET Role

Models: MVME147

1 170

Download 170 pages 32.5 Kb

Page 73

Enabling TARGET Role

Enabling TARGET Role

enable (word $0E = $C000), and with the following data structures reserved for TARGET role service.

a.Command Table (384 bytes)

6

Note

During the TARGET role, when the TARGET enable packet is issued to the firmware, neither the custom command packet nor the command table shall be deallocated because firmware uses both areas for subsequent TARGET service.

b.Message-out area (the SCSI standard allows for a 258-byte extended message)

Note

In SCSI terms, all transfer directions are referenced to the initiator. For example, the data out phase is a data phase for data OUT of the initiator and INTO the TARGET. Therefore, the message-out area mentioned above is for message STORAGE from the initiator to the TARGET.

c.Take over the return vector specified in the packet of 1. above. Put the service routine address in the vector.

d.Load address register A2 with the address of the custom sequence packet described in 1. above.

e.Enter the SCSI firmware through the FUNNEL entry point ($FFFE078E) at interrupt level 2. (For a description of the FUNNEL module, refer to the SCSI Firmware Entry Points section in Chapter 1.

f.Examine the returned final status for a code of $xx17. This is a signal that the firmware has acknowledged the enable packet and the initiator command has been received. (This status may be preceded by a $A002 if the bus is occupied at the time that the enable packet was sent to the firmware.)

g.The service of the TARGET LUN is now interrupt-driven by the initiator. A selection interrupt causes the firmware to examine enabled TARGET LUNs and load commands and/or messages into the designated areas for service. If a command is received for an enabled TARGET logical unit, then the firmware returns to you with either a $xx17 final status (SCSI mode) or an intermediate status of $xx06 (SASI mode or initiator not supporting disconnection), indicating that the CDB has been loaded into

6-5

Image 73

Emerson MVME147 manual Enabling TARGET Role

Contents

GENERAL INFORMATION FeaturesIntroduction Modes of OperationMVME147 SCSI Firmware Entry Points The SCSI firmware initializes these vectors Equipment Supported CONTROLLE CONTROLLE CONTROLLEDEVICE PARTCONTROLLE Devices Supported Under Common Command SetDEVICE PARTMOTOROLA Related DocumentationDOCUMENT TITLE PUBLICATION NUMBERMOTOROLA Manual TerminologyGENERAL INFORMATION Initiator Role Custom Packet CUSTOM SCSI PACKETSIntroduction CUSTOM SCSI PACKETS Initiator Role Custom Packet NOTES PHASE PHASE CODEInitiator 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 PacketStatus from SCSI NOTESTARGET Enable Custom Packet TARGET Sequence Custom Packet TARGET Sequence Custom Packet NOTES CUSTOM SCSI PACKETSTARGET 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 TARGET Sequence Custom PacketCUSTOM SCSI PACKETS Packet Return Status PACKET RETURN STATUSControl Flags SCSI 1 = Retries were performed Bit 5 COMMAND RE Bit 3 FM Filemark Bit 4 COMMAND RETRYThe command was retried retry count times Packet Return Status Bit 2 EOM End of mediaPACKET RETURN STATUS Intermediate Return Table 3-1.Packet Status CodesCodes CODETable 3-1.Packet Status Codes Final Return CodesCODE Intermediate ReturnSCSI Bus Reset Packet section in Chapter Table 3-2.Packet Status Codes cont’dCODE MEANINGTable 3-3.Packet Status Codes cont’d Request-Sense-Data Error-Class7 CodesController-Dependent CODETable 3-4.Packet Status Codes cont’d SCSI Status Returned in Status PhaseCODE MEANINGTable 3-5.Packet Status Codes cont’d Request-Sense-Data Error-Class0 through 6 CodesCODE Controller-DependentPage PACKET RETURN STATUS SCSI Firmware Interrupt Structure SCSI FIRMWARE INTERRUPT STRUCTURESCSI FIRMWARE INTERRUPT STRUCTURE SCSI_CMD WRITING A DRIVERSCSI_ACTV SCSI_INTBuilding the Packet Passing Commands to the SCSI FirmwareInterface Rules for the SCSI Firmware Figure 5-1.SCSI Disk Driver Interface to VERSAdosInterface 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 ROUTINESIntroduction Custom Sequence Packet SCSI Versus SASI RulesScript Command TableEnabling 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 Table 7-1.SCSI Functions SCSI PACKETSIntroduction SCSITable Read/Write PacketSCSI Functions cont’d SCSIDISK and TAPE Controller logical unit in SG table, if zero Old Packet Supported for Compatibility SCSI PACKETS+$12 in SG table, if zero Read/Write Packet DMA Scatter/Gather Table Entry|function code 3 bits 1 = link to next entryFor example $5 isAttach/Detach Packet all devices COMMANDCOMMAND CONTROLLERAttach/Detach Packet all devices COMMANDSCSI PACKETS +$1E FM encoding, single Controller type refer xxxxxxxx attributes byte offset +$20 Single track density Drive type 0 = Example for floppy Attach/Detach Packet all devices3½, 5¼ 3½, 5¼,3½, 5¼, 3½, 5¼3½, 5¼ 3½, 5¼+$04 Minimum read QIC-24 if this is set to 0, the +$00 Reserved Interrupt level +$00 +$9E $00 Format Packet COMMAND Assign Alternate Sector Packet SCSI+$0E Assign Alternate Sector Packet SCSI DEFECT LIST TYPE SCSI PACKETS0 Note 3, Head Bytes from Index MSW Note NOTESSCSI 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 Verify CRC Packet The controller must be in general or read modeTape 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 SCSI PACKETS Open PacketOpen Packet SCSI PACKETS BYTE OFFSET COMMON COMMAND SET AND DISK OPERATIONBYTE BYTE OFFSET BYTEBYTE OFFSET BYTE OFFSET ENTRY NUMBERNOTES COMMON COMMAND SET AND DISK OPERATIONSend mode select command COMMON COMMAND SET AND DISK OPERATION DEFECT LIST TYPE DEFECT LISTBYTE OFFSET NOTESBYTE OFFSET Mode Select HeaderBYTE OFFSET BYTE OFFSET Block DescriptorNOTES COMMON COMMAND SET AND DISK OPERATIONBYTE OFFSET BYTE OFFSET Mode Select HeaderBlock Descriptor BYTE OFFSETBYTE OFFSET BYTE OFFSETNOTES VALUEBYTE OFFSET Mode Select Command CDBVALUE COMMENTSMode Select Header COMMON COMMAND SET AND DISK OPERATIONBYTE OFFSET Block DescriptorBYTE OFFSET BYTE OFFSETPage code NOTES COMMON COMMAND SET AND DISK OPERATIONBYTE OFFSET MEDIA ATTRIBUTE FLAGSTYPE Mode Select HeaderATTRIBUTE FLAGS COMMON COMMAND SET AND DISK OPERATIONMEDIA TYPEBYTE OFFSET BYTE OFFSETNOTES VALUECOMMON COMMAND SET AND DISK OPERATION PIN 34 CONTROLPin 2 and Pin 34 Definition for High Density Pin 2 and Pin 34 Definition for Low DensityPIN 2 CONTROL PIN 34 CONTROLCOMMENTS Pin 34 = driveA-22