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Seagate Ultra 160 Manual De Usuario

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Parallel SCSI Interface Product Manual, Rev. A )                                       
   21
Table 5:
SCSI bus data and information phase ST timing values
[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]
Cable skew is measured at each SCSI device connection within the same bus segment with the transmit-
ted skew subtracted from the received skew.
[3]
See Section 2.6 for measurement points for the timing specifications.
[4]
See Section 9.6 in the ANSI SCSI Parallel Interface-5 (SPI-5) specification for examples of how to calcu-
late setup and hold timing.
Table 6:
Miscellaneous SCSI bus data and information phase DT timing values
[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.
Timing description
Reference
Type
Timing values for negotiated transfer rate in 
nanoseconds unless otherwise noted 
Asynch
Fast-5
Fast-10
Fast-20 Fast-40
ATN transmit setup time
min
90
33
33
21.5
19.25
ATN receive setup time
min
45
17
17
8.5
6.75
Cable skew 
max
4.0
4.0
4.0
3.0
2.5
Receive assertion period 
min
N/A
70
22
11
6.5
Receive hold time 
min
N/A
25
25
11.5
4.75
Receive negation period 
min
N/A
70
22
11
6.5
Receive setup time 
min
N/A
15
15
6.5
4.75
Receive REQ(ACK) period tolerance
min
N/A
1.1
1.1
1.1
1.1
Signal timing skew
max
8.0
8.0
8.0
5.0
4.5
REQ(ACK) period
nom
N/A
200
100
50
25
Transmit assertion period 
min
N/A
80
30
15
8.0
min
N/A
53
33
16.5
9.25
Transmit negation period 
[3]
min
N/A
80
30
15
8.0
Transmit setup time 
min
N/A
23
23
11.5
9.25
Transmit REQ(ACK) period tolerance
max
N/A
1.0
1.0
1.0
1.0
Timing description
Reference
Type
Timing values for negotiated transfer rate in nanoseconds 
unless otherwise noted 
Fast-10
Fast-20
Fast-40 Fast-80
Fast-160
Fast-320
Cable skew 
max
4.0
3.0
2.5
2.5
2.5
2.5
REQ(ACK) period
nom
200
100
50
25
12.5
6.25
Residual skew error 
max
N/A
N/A
N/A
N/A
±
0.15
±
 0.20
Skew correction range 
min
N/A
N/A
N/A
N/A
±
3.45 
±
 3.45 
Signal timing skew
max
26.8
13.4
6.7
3.35
4.85
4.85
Strobe offset tolerance
max
N/A
N/A
N/A
N/A
±
0.125
±
0.125