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COMMON COMMAND SET AND DISK OPERATION
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MVME147 SCSI Firmware: Winchester Disk Parameters.
Before formatting a Winchester disk, the MVME147 SCSI firmware sends a
mode select command for read/write error recovery parameters (page 1) to
the controller. Below is the command descriptor block for the mode select
command:
Mode Select Command CDB
The first twelve bytes that are transferred during the DATA OUT phase for the
mode select command make up the mode select header, and the block
descriptor which is described below:
Mode Select Header and Block Descriptor
BYTE OFFSET
VALUE COMMENTS
0 15 Command code
1 10 LUN = 0, PF = 1, SP = 0
200Reserved
300Reserved
4 (Note) Parameter list length
5 00 Control byte: no link, no flag
NOTE:
If all of the parameters match or are not changeable,
only the mode select header and block descriptor is
sent, and the parameter list length is be $0C.
If a parameter is changed based on the current,
changeable, and the packet parameter, the entire page
1 including the mode select header and the block
descriptor is sent, and the parameter list length is $18.
BYTE OFFSET
VALUE COMMENTS
Mode Select Header
000Reserved
1 00 Media type
200Reserved