Seagate Ultra 320 User Manual
Parallel SCSI Interface Product Manual, Rev. A )
41
When negotiating, the responding port shall respond with values that are a subset of the values in the originat-
ing message as indicated in Table 12 (e.g., if the originating message requests a REQ/ACK offset of 10h, the
responding message has a REQ/ACK offset field set to 10h or lower).
ing message as indicated in Table 12 (e.g., if the originating message requests a REQ/ACK offset of 10h, the
responding message has a REQ/ACK offset field set to 10h or lower).
Protocol
options
PCOMP_EN
Negotiated
Sets to 00h
Sets to 00h
RTI
Negotiated
Sets to 00h
Sets to 00h
RD_STRM
Negotiated
Sets to 00h
Sets to 00h
WR_FLOW
Negotiated
Sets to 00h
Sets to 00h
HOLD_MCS
Negotiated
Sets to 00h
Sets to 00h
QAS_REQ
Negotiated
Sets to 00h
Sets to 00h
DT_REQ
Negotiated
Sets to 00h
Sets to 00h
IU_REQ
Negotiated
Sets to 00h
Sets to 00h
Table 12:
Responding message requirements
Field Name
Message
Response shall be
numerically
numerically
Transfer Period Factor
PPR, SDTR
Greater than or equal
REQ/ACK Offset
PPR, SDTR
Less than or equal
Transfer Width Expo-
nent
nent
PPR, WDTR
00h or 01h
Protocol
Options
PCOMP_EN
PPR
Less than or equal
RTI
PPR
Less than or equal
RD_STRM
PPR
Less than or equal
WR_FLOW
PPR
Less than or equal
HOLD_MCS
PPR
Less than or equal
QAS_REQ
PPR
Less than or equal
DT_REQ
PPR
Less than or equal
IU_REQ
PPR
Less than or equal
Table 11:
Negotiable fields and effects of successful negotiation
Field name
Negotiation message pair
PPR
WDTR
SDTR