Read Block Limits Packet | 7 |
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Read Block Limits Packet
The read block limits command ($05) returns the maximum and minimum block size written on the tape. The controllers supported by the SCSI firmware only support QIC 24 or QIC 11 type blocks which equal 512 ($200) bytes.
The table below shows the read block limits packet.
Even Byte \
Odd Byte \
| FC |
| B8 |
| 74 |
| 30 |
|
|
|
|
|
|
|
|
+$00 |
| Controller LUN |
|
| Device LUN | ||
|
|
|
|
| |||
+$02 |
| Status Byte 0 |
| Status Byte 1 (Note 1) | |||
|
|
|
|
| |||
+$04 |
| Returned Maximum Block Length (MSW) | |||||
|
|
| |||||
+$06 |
| Returned Maximum Block Length (LSW) | |||||
|
|
|
| ||||
+$08 |
|
| Returned Minimum Block Length | ||||
|
|
|
|
|
|
|
|
+$0A |
| 0 |
| 0 | 0 |
| 0 |
|
|
|
|
|
|
|
|
+$0C |
| 0 |
| 0 | 0 |
| 0 |
|
|
|
|
|
|
|
|
+$0E |
| 0 |
| 0 | 0 |
| 0 |
|
|
|
|
|
|
|
|
+$10 |
| 0 |
| 0 | 0 |
| 0 |
|
|
|
|
|
|
|
|
+$12 |
| 0 |
| 0 | 0 |
| 0 |
|
|
|
|
|
|
| |
+$14 |
| 0 |
| 0 | Function Code (34) | ||
|
|
|
|
|
|
|
|
+$16 |
| Interrupt Level |
|
| Vector Number | ||
|
|
|
|
| |||
+$18 |
| Status Byte 2 |
| Status Byte 3 (Note 1) | |||
|
|
|
|
|
|
|
|
$00 |
| 00000xxx |
|
| Controller logical unit | ||
|
|
|
|
|
| number | |
$01 |
| 00000xxx |
|
| Device logical unit | ||
|
|
|
|
|
| number | |
$02 |
| xxxxxxxx |
|
| Status from SCSI | ||
|
|
|
|
|
| firmware (byte 0) | |
|
|
|
|
|
| (Note 1) | |
$03 |
| xxxxxxxx |
|
| Status from SCSI | ||
|
|
|
|
|
| firmware (byte 1) | |
|
|
|
|
|
| (Note 1) | |
