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COMMON COMMAND SET AND DISK OPERATION
A-2
A
Test Unit Ready Command CDB
The firmware sends a mode sense command for page 3, current values. The
returned block size is compared to the block size in the packet; if they are not
the same, the firmware sets a internal flag to block all subsequent read or write
commands. In this case, the firmware returns a command error ($0B) status.
Mode Sense Command CDB
The READ/WRITE command performs the following to a Winchester disk:
1 01 Extended message
2 03 Extended message length
3 01 Synchronous data transfer
request
4 32 Transfer period (50 times 4 ns
= 200 ns
505REQ/ACK offset
BYTE OFFSET
VALUE COMMENTS
0 00 Command code
1 00 LUN is inserted into bits 7-5
200Reserved
300Reserved
400Reserved
5 00 Control byte: no link, no flag
BYTE OFFSET
VALUE COMMENTS
0 1A Command code
1 00 LUN is inserted into bits 7-5
2 03 Page 3, current values
300Reserved
4 2C Allocation length
5 00 Control byte: no link, no flag
BYTE
VALUE COMMENTS