Negotiable Field Combinations - Seagate Ultra 160 Product Manual

2.12.9

Negotiable field combinations

Not all combinations of the negotiable fields are valid. Only the combinations defined in Table 20 shall be
allowed. All other combinations of the listed fields are reserved.
Table 20: Valid negotiable field combinations
Transfer REQ/ Transfer
period ACK width
factor offset exponent
Ignore 00h 00h or 01h
Ignore 00h 00h or 01h
0Ah - FFh 01h - 00h or 01h
FFh
09h - FFh 01h - 01h
FFh
09h - FFh 01h - 01h
FFh
0Ah - FFh 01h - 00h or 01h
FFh
09h - FFh 01h - 01h
FFh
07h 01h- 01h
FFh
08h 01h - 01h
FFh
09h - FFh 01h - 01h
FFh
07h 01h- 01h
FFh
08h 01h - 01h
FFh
48
Protocol options
0 0 0 0 0 0
0 0 0 0 0 1
0 0 0 0 0 0
0 0 0 0 0 0
0 0 0 0 0 1
0 0 0 0 0 1
0 0 0 0 0 0
or or
1 1
0 0 0 0 0 0
or or or or
1 1 1 1
0 0 0 0 0 0
or or or or or
1 1 1 1 1
0 0 0 0 0 1
or or
1 1
0 0 0 0 0 1
or or or or
1 1 1 1
0 0 0 0 0 1
or or or or or
1 1 1 1 1
Description
0 0
Use ST DATA IN and ST DATA OUT phases
to transfer data with asynchronous transfers.
0 0
Use ST DATA IN and ST DATA OUT phases
to transfer data with asynchronous transfers,
and participate in QAS arbitrations.
0 0
Use ST DATA IN and ST DATA OUT phases
to transfer data with synchronous transfers.
1 0
Use DT DATA IN and DT DATA OUT phases
with data group transfers.
1 0
Use DT DATA IN and DT DATA OUT phases
with data group transfers, and participate in
QAS arbitrations.
0 0
Use ST DATA IN and ST DATA OUT phases
to transfer data with synchronous transfers,
and participate in QAS arbitrations
1 1
Use DT DATA IN and DT DATA OUT phases
with synchronous transfers and information
unit transfers
1 1
Use DT DATA IN and DT DATA OUT phases
with paced transfers and information unit
transfers
1 1
Use DT DATA IN and DT DATA OUT phases
with synchronous transfers and information
unit transfers.
1 1
Use DT DATA IN and DT DATA OUT phases
with paced transfers and information unit
transfers, participate in QAS arbitrations, and
issue QAS_REQUEST messages to initiate
QAS arbitrations.
1 1
Use DT DATA IN and DT DATA OUT phases
with paced transfers and information unit
transfers, participate in QAS arbitrations, and
issue QAS_REQUEST messages to initiate
QAS arbitrations
1 1
Use DT DATA IN and DT DATA OUT phases
with information unit transfers, participate in
QAS arbitrations, and issue QAS_REQUEST
messages to initiate QAS arbitrations.
Parallel SCSI Interface Product Manual, Rev. A )