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C141-E123-01EN
1-28
1.5
Timing Rule
1.5.1 Timing
value
Table 1.15, 16, 17 give the timing required for operations on the SCSI bus.
Table 1.15
SCSI bus control timing values
Timing description
Type
Timing values
1
Arbitration Delay
min.
2.4
µ
s
2
Bus Clear Delay
max.
800 ns
3
Bus Free Delay
min.
800 ns
4
Bus Set Delay
max.
1.6
µ
s
5
Bus Settle Delay
min.
400 ns
6
Cable Skew (1)
max.
4 ns
7
Data Release Delay
max.
400 ns
8
DIFFSENS voltage filter time
min.
100 ms
9
Physical Disconnection Delay
min.
200
µ
s
10
Power on to Selection (2)
max.
10 s
11
Reset Delay
min.
200 ns
12
Reset Hold Time
min.
25
µ
s
13
Reset to Selection (2)
max.
250 ms
14
Selection Abort Time
max.
200
µ
s
15
Selection Time-Out Delay
min.
250 ms
16
System Deslew Delay
min.
45 ns
Note:
(1) Cable Skew is measured at each device connection with the transmitted skew subtracted from the
received skew. (2) This is a recommended time. It is not mandatory.
Table 1.16
SCSI bus data & information phase ST timing values
Timing values [ns] (5)
Timing description
Type
Async
Fast-5
Fast-10
Fast-20
Fast-40
1
ATN Transmit Setup Time
min.
90
33
33
21.5
19.25
2
ATN Receive Setup Time
min.
45
17
17
8.5
6.75
3
Cable Skew (3)
max.
4
4
4
3
2.5
4
Receive Assertion Period (4)
min.
N/A
70
22
11
6.5
5
Receive Hold Time (4)
min.
N/A
25
25
11.5
4.75
6
Receive Negation Period (4)
min.
N/A
70
22
11
6.5
7
Receive Setup Time (4)
min.
N/A
15
15
6.5
4.75
8
Receive REQ (ACK) Period Tolerance
min.
N/A
1.1
1.1
1.1
1.1
9
Signal Timing Skew
max.
8
8
8
5
4.5
10
REQ (ACK) Period
min.
N/A
200
100
50
25
11
Transmit Assertion Period (4)
min.
N/A
80
30
15
8
12
Transmit Hold Time (4)
min.
N/A
53
33
16.5
9.25
13
Transmit Negation Period (4)
min.
N/A
80
30
15
8
14
Transmit Setup Time (4)
min.
N/A
23
23
11.5
9.25
15
Transmit REQ (ACK) Period Tolerance
max.
N/A
1
1
1
1
Note:
(3) Cable Skew is measured at each device connection with the transmitted skew subtracted from the
received skew. (4) See Fig.1-17,18,19 for measurement points for the timing specifications. (5)
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.
Содержание MAN3184 SERIES
Страница 1: ...C141 E123 01EN MAN3184 MAN3367 MAN3735 SERIES DISK DRIVES SCSI PHYSICAL INTERFACE SPECIFICATIONS ...
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Страница 27: ...C141 E123 01EN 1 9 M M 0 61 5 16 0 001 0 396 Figure 1 5 SCSI interface connector cable side 16 bit SCSI ...
Страница 61: ...C141 E123 01EN 1 43 Figure 1 22 ARBITRATION phase ...
Страница 95: ...C141 E123 01EN 1 77 Figure 1 34 Bus phase sequence 1 of 2 ...
Страница 96: ...C141 E123 01EN 1 78 Figure 1 34 Bus phase sequence 2 of 2 ...
Страница 97: ...C141 E123 01EN 1 79 Figure 1 35 Example of bus phase transition at execution of a single command 1 of 5 ...
Страница 98: ...C141 E123 01EN 1 80 Figure 1 35 Example of bus phase transition at execution of a single command 2 of 5 ...
Страница 100: ...C141 E123 01EN 1 82 Figure 1 35 Example of bus phase transition at execution of a single command 4 of 5 ...
Страница 101: ...C141 E123 01EN 1 83 Figure 1 35 Example of bus phase transition at execution of a single command 5 of 5 TASK COMPLETE ...
Страница 124: ...C141 E123 01EN 2 7 Figure 2 2 SCSI pointer configuration ...
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