Seagate Ultra160 Product Manual page 39

SCSI Interface Product Manual, Rev. B
Timing description
Transmit hold time [2] [3]
Transmit ISI compensation
Transmit negation period [2]
Transmit REQ(ACK) period tolerance Section 2.5.58 max 0.6 ns
Transmit REQ assertion period with
P_CRCA transitioning
Transmit setup time [2] [3]
Transmitter skew
Transmitter time asymmetry
[1] SCSI bus timing values specified by the maximum transfer rate for the given range shall apply even if a
slower transfer rate within the given range is negotiated.
[2] See Section 2.6 for measurement points for the timing specifications.
[3] See Section 9.6 in the ANSI SCSI Parallel Interface-4 (SPI-4) specification for examples of how to calcu-
late setup and hold timing.
Note. Fast-160 SCSI devices shall not change timing parameters between training or reset events.
Table 8: Receive SCSI bus data and information phase DT timing values
Timing description
ATN receive setup time
Flow control receive hold time
Flow control receive setup time
pCRC receive hold time
pCRC receive setup time
Receive assertion period [2]
Receive hold time [2] [3]
Receive negation period [2]
Receive setup time [2] [3]
Receive REQ(ACK) period tolerance
Receive REQ negation period with
P_CRCA transitioning
Receive skew compensation
Receive internal hold time [4]
Receive internal setup time
[1] SCSI bus timing values specified by the maximum transfer rate for the given range shall apply even if a
slower transfer rate within the given range is negotiated.
[2] See Section 2.6 for measurement points for the timing specifications.
[3] See Section 9.6 in the ANSI SCSI Parallel Interface-4 (SPI-4) specification for examples of how to calcu-
late setup and hold timing.
[4] Calculated assuming timing budget shown in Table 9.
Note. Fast-160 SCSI devices shall not change timing parameters between training or reset events.
Reference Type Fast-10 Fast-20 Fast-40 Fast-80 Fast-160
Section 2.5.54 min 38.4 ns 19.2 ns 9.6 ns
Section 2.5.55 max
Section 2.5.56 min 92 ns
Section 2.5.59 min 97.5 ns 54 ns
Section 2.5.57 min 38.4 ns 19.2 ns 9.6 ns
Section 2.5.61 max N/A
Section 2.5.62 max N/A
Reference Type Fast-10 Fast-20 Fast-40 Fast-80 Fast-160
Section 2.5.3 min 13.6 ns 7.8 ns
Section 2.5.12 min 11.6 ns 5.8 ns
Section 2.5.13 min 18.6 ns 12.8 ns 9.9 ns
Section 2.5.16 min 11.6 ns 5.8 ns
Section 2.5.17 min 18.6 ns 12.8 ns 9.9 ns
Section 2.5.28 min 80 ns
Section 2.5.29 min 11.6 ns 5.8 ns
Section 2.5.32 min 80 ns
Section 2.5.33 min 11.6 ns 5.8 ns
Section 2.5.34 min 0.7 ns
Section 2.5.36 min 85.5 ns 48 ns
Section 2.5.37 max N/A
Section 2.5.30 min N/A
Section 2.5.31 min N/A
Timing values for negotiated transfer rate [1]
46 ns 23 ns
0.6 ns 0.6 ns
35.5 ns 24 ns
N/A N/A
N/A N/A
Timing values for negotiated transfer rate [1]
4.9 ns
2.9 ns
2.9 ns
40 ns 20 ns
2.9 ns
40 ns 20 ns
2.9 ns
0.7 ns 0.7 ns
32.5 ns 21 ns
N/A N/A
N/A N/A
N/A N/A
21
4.8 ns 4.77 ns
1.0 ns
11.5 ns 5.69 ns
0.6 ns 0.06 ns
N/A
4.8 ns 1.48 ns
N/A +/– 0.75 ns
N/A +/– 0.25 ns
3.45 ns 3 ns
1.45 ns 3 ns
8.45 ns 3 ns
1.45 ns N/A
8.45 ns N/A
8.5 ns 4.74 ns
1.45 ns 0.08 ns
8.5 ns 4.74 ns
1.45 ns 6.33 ns
0.7 ns 0.06 ns
N/A
N/A N/A
N/A 0.345 ns
N/A 0.345 ns