2 |
CUSTOM SCSI PACKETS
PHASE | DIRECTION | NOTES | |
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Message | initiator | Messages are sent to the TARGET to send bus, | |
out | to TARGET | command, and controller information. | |
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| Examples: identify, initiator detected error, | |
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| abort, device reset. | |
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Scripts only specify the information transfer phases. The bus free, arbitration, and selection phases do not need to be specified in a script. The script codes that are understood by the MVME147 SCSI firmware are listed in the following table. (Note that TARGET role scripts are described in the Target Sequence Custom Packet section in this chapter.
| CODE | BUS PHASES | ROLE | |
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$00 | END OF SCRIPT | Initiator | ||
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| DISCONNECT | TARGET | |
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$04 | COMMAND PHASE | Initiator and TARGET | ||
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$08 | Initiator and TARGET | |||
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| $0C | Initiator and TARGET | ||
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$10 | STATUS PHASE | Initiator and TARGET | ||
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$14 | Initiator and TARGET | |||
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$18 | Initiator and TARGET | |||
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| $1C | END OF SCRIPT | TARGET | |
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| NOT DEFINED | Initiator | |
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$20 | TARGET WAIT, | TARGET | ||
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| NO DISCONNECT |
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$24 | TARGET WAIT, | TARGET | ||
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| DISCONNECT |
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$28 | TARGET WAIT, | TARGET | ||
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| NO DISCONNECT |
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| DATA RECEIVED |
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| $2C | TARGET WAIT, | TARGET | |
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| DISCONNECT |
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| DATA RECEIVED |
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