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Load/Unload Packet
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7
Load/Unload Packet
The load/unload command ($1B) positions the tape for removal or to BOT.
The load mode positions the tape at BOT, and the unload mode positions the
tape at End Of Tape (EOT). The retension bit causes the tape to go to BOT, then
to EOT, then to BOT for the load mode. This is done before the load or unload
function, if enabled.
If the immediate response bit is set, status is returned immediately even
though the controller is still busy. If a new command is sent before the
controller is finished, a busy error ($xx34) may be sent back to the MVME147
firmware, but the firmware performs an internal retry after the current
command is done. If the immediate bit is not set, status is not returned until
the command is finished.
The table below shows the load/unload packet.
Even Byte \
Odd Byte \
$1E xxxxxxxx xxxxxxxx Data returned (Note
1)
NOTE:
1. Controller-specific.
FC B8 74 30
+$00 Controller LUN Device LUN
+$02 Status Byte 0 Status Byte 1 (Note 1)
+$04 0000
+$06 0000
+$08 0000
+$0A 0000
+$0C 0000
+$0E Mode Load/Unload 0 0
+$10 0 0 0
0 +$12