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COMMON COMMAND SET AND DISK OPERATION
A-10
A
Before formatting a Winchester disk, the MVME147 SCSI firmware sends a
mode select command for format parameters (page 3) 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
NOTES:
1. If the retry field in the attach packet byte offset $1B is = 00, the
DCR (disable correction) bit is set and the read retry count field is
set to 00.
If the retry field in the attach packet byte offset $1B is NOT = 00,
the fields at byte 2 and 3 are left as the default value as returned
from the mode sense command.
2. This field is left as the default value as returned from the mode
sense command.
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
3 including the mode select header and the block
descriptor is sent, and the parameter list length is $24.