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Extended Message support
Name
Synchronous Data
Transfer Request
Wide Data Transfer
Parallel Protocol
Request
Synchronous Data Transfer Request
7
0
1
2
3
4
Wide Data Transfer Request
7
0
1
2
3
Code Support
01h
The drive can initiate a Synchronous data transfer negotiation. If the
message is received after selection and before the command phase, it
will then go to message-in phase and respond with a valid response to
complete the negotiation.
03h
The drive can initiate a Wide data transfer negotiation. If the message
is received after selection and before the command phase, it will then
go to message-in phase and respond with a valid response to complete
the negotiation.
Note that SDTR negotiated parameters will become asynchronous after
a WDTR.
The drive will never initiate a Parallel Protocol Request transfer
04h
negotiation but will expect the initiator to do so.
If the message is received after selection and before the command
phase, it will then go to message-in phase and respond with a valid
response to complete the negotiation.
6
5
4
Extended Message (01h)
Extended Message Length (03h)
SDTR (01h)
Transfer Period Factor
Req/Ack Offset
6
5
4
Extended Message (01h)
Extended Message Length (02h)
WDTR (01h)
Transfer Width Exponent
3
2
1
3
2
1
0
0
25
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