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COMMON COMMAND SET AND DISK OPERATION
A-14
A
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
The remaining 20 bytes that are transferred during the DATA OUT phase for
the mode select command are the page 4 parameters.
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 $20.
BYTE OFFSET
VALUE COMMENTS
Mode Select Header
000Reserved
1 00 Media type
200Reserved
3 08 Block descriptor length
Block Descriptor
000Reserved
1 00 Number of blocks (MSB)
2 00 Number of blocks
3 00 Number of blocks (LSB)
400Reserved
5 00 Block length (MSB)
6(Note)Block length
7 (Note) Block length (LSB)
NOTE:
The block length is taken from the attach packet,
byte offset $1C, bytes per block.