Seagate Ultra 320 User Manual Page 62
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48 Parallel SCSI Interface Product Manual, Rev. A )
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
period
factor
REQ/
ACK
offset
Transfer
width
exponent
Protocol options
Description
PCOMP_EN
RTI
RD_STRM
WR_FLOW
HOLD_MCS
QAS_REQ
DT_REQ
IU_REQ
Ignore 00h 00h or 01h 0 0 0 0 0 0 0 0
Use ST DATA IN and ST DATA OUT phases
to transfer data with asynchronous transfers.
Ignore 00h 00h or 01h 0 0 0 0 0 1 0 0
Use ST DATA IN and ST DATA OUT phases
to transfer data with asynchronous transfers,
and participate in QAS arbitrations.
0Ah - FFh 01h -
FFh
00h or 01h 0 0 0 0 0 0 0 0
Use ST DATA IN and ST DATA OUT phases
to transfer data with synchronous transfers.
09h - FFh 01h -
FFh
01h 0 0 0 0 0 0 1 0
Use DT DATA IN and DT DATA OUT phases
with data group transfers.
09h - FFh 01h -
FFh
01h 0 0 0 0 0 1 1 0
Use DT DATA IN and DT DATA OUT phases
with data group transfers, and participate in
QAS arbitrations.
0Ah - FFh 01h -
FFh
00h or 01h 0 0 0 0 0 1 0 0
Use ST DATA IN and ST DATA OUT phases
to transfer data with synchronous transfers,
and participate in QAS arbitrations
09h - FFh 01h -
FFh
01h 0 0 0
or
1
0
or
1
0 0 1 1
Use DT DATA IN and DT DATA OUT phases
with synchronous transfers and information
unit transfers
07h 01h-
FFh
01h 0 0
or
1
0
or
1
0
or
1
0
or
1
0 1 1
Use DT DATA IN and DT DATA OUT phases
with paced transfers and information unit
transfers
08h 01h -
FFh
01h 0
or
1
0
or
1
0
or
1
0
or
1
0
or
1
0 1 1
Use DT DATA IN and DT DATA OUT phases
with synchronous transfers and information
unit transfers.
09h - FFh 01h -
FFh
01h 0 0 0
or
1
0
or
1
0 1 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.
07h 01h-
FFh
01h 0 0
or
1
0
or
1
0
or
1
0
or
1
1 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
08h 01h -
FFh
01h 0
or
1
0
or
1
0
or
1
0
or
1
0
or
1
1 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 1
- Revision status summary sheet 5
- Table of Contents 7
- List of Figures 13
- 1.0 Interface requirements 15
- standards 16
- 1.4 Summary of SCSI messages 26
- 2.0 SCSI bus 27
- 2.1 SCSI bus signals overview 29
- 2.2 Signal states 31
- 2.3 OR-tied signals 32
- 2.4 Signal sources 33
- 2.5 SCSI bus timing 34
- 0 0.5 0 0.2 39
- induced time asymmetry 39
- due to resis 43
- 2.6 Measurement points 47
- 2.9 Data transfer modes 51
- 2.12 Negotiation 53
- PPR, SDTR Less than or equal 55
- 2.12.4 Transfer agreements 56
- Table 13: Transfer agreements 56
- bit shall be set to zero 61
- Transfer 62
- 3.0 Logical characteristics 65
- 3.2 SELECTION phase 69
- 3.3 RESELECTION phase 72
- 3.4 SCSI bus fairness 73
- 3.6 COMMAND phase 89
- 3.7 DATA phase 89
- 3.8 STATUS phase 90
- 3.9 MESSAGE phase 90
- 3.11 SCSI bus phase sequences 92
- 3.12 Data bus protection 95
- 4.2 Message formats 97
- 4.3 Message categories 99
- 7 6 5 4 3 2 1 0 101
- 0 IDENTIFY DISCPRIV LUN 101
- Target’s Parallel Protocol 109
- 4.4 Task attribute messages 116
- 4.5 Task management messages 119
- 5.1 Attention condition 121
- 5.2 Bus reset condition 122
- 5.3 Hard reset 122
- 5.4 Reset events 123
- 6.0 SPI information units 127
- [3] See Figure 16 129
- [4] See Figure 18 129
- [3] See Figure 18 130
- 6.2 SPI information units 132
- field shall be reserved 135
- field is not zero 135
- 129 143
- 7.0 SCSI commands 145
- See notes following Table 61 148
- 7.3 Status 152
- 7.4 Command examples 154
- 7.5 Timing examples 156
- 7.8 Parameter rounding 163
- 8.0 Drive features 165
- Command, Message, and Status 168
- (Bits 14 171
- Seagate Technology LLC 186
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