Chapter 4 Command Operation
Page 4 - 10 |
| Single Command Structure |
Interrupt
Note
If you have set the ISB (Issue Status Block) bit in the Retry Control field of the Unit Options or Extended Unit Options command, it will be ignored for commands issued through Single Command structure.
This field selects the Interrupt level which the RF3880 adapter will use when the command issued through the Single Command structure completes. You can also denote the resultant interrupt acknowledge ID that the adapter will place on the data bus in response to the Host. The Interrupt field uses these bit- meanings:
BITS
15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 |
| 3 | 2 | 1 | 0 |
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0 | 0 | 0 | 0 | 0 |
| INT |
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| ID |
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Table 21: Bit-meanings of Interrupt Field
ID Status/ID - This byte denotes the Status/ID value that the adapter will provide to identify the interrupt being acknowledged by the Host.
INT Interrupt Level - You may elect to use any one of the following levels for adapter interrupt:
000 — Interrupt disabled
001 — Interrupt level 1
010 — Interrupt level 2
011 — Interrupt level 3
100 — Interrupt level 4
101 — Interrupt level 5
110 — Interrupt level 6
111 — Interrupt level 7
Status Block - The Status Block is the means by which the RF3880 adapter communicates successful command completion, error conditions, retry information or SCSI Sense Bytes. Status Block information specific to the type of command you issued can be found in Chapters 5, 6 and 7.
If the status from a command issued within a Single Command structure requires multiple Status Blocks to report the status, only the last block is saved in the structure.
21020285 D | User’s Guide |
