Timing Rule; Timing Value; Scsi Bus Control Timing Values; Scsi Bus Data & Information Phase St Timing Values - Fujitsu MAN3184 SERIES Specifications

1.5

Timing Rule

1.5.1

Timing value

Table 1.15, 16, 17 give the timing required for operations on the SCSI bus.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
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
Timing description
1 ATN Transmit Setup Time
2 ATN Receive Setup Time
3 Cable Skew (3)
4 Receive Assertion Period (4)
5 Receive Hold Time (4)
6 Receive Negation Period (4)
7 Receive Setup Time (4)
8 Receive REQ (ACK) Period Tolerance
9 Signal Timing Skew
10 REQ (ACK) Period
11 Transmit Assertion Period (4)
12 Transmit Hold Time (4)
13 Transmit Negation Period (4)
14 Transmit Setup Time (4)
15 Transmit REQ (ACK) Period Tolerance
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.
1-28
Table 1.15

SCSI bus control timing values

Timing description
Arbitration Delay
Bus Clear Delay
Bus Free Delay
Bus Set Delay
Bus Settle Delay
Cable Skew (1)
Data Release Delay
DIFFSENS voltage filter time
Physical Disconnection Delay
Power on to Selection (2)
Reset Delay
Reset Hold Time
Reset to Selection (2)
Selection Abort Time
Selection Time-Out Delay
System Deslew Delay
SCSI bus data & information phase ST timing values
C141-E123-01EN
Type Timing values
min.
2.4 s
max. 800 ns
min. 800 ns
max.
1.6 s
min. 400 ns
max. 4 ns
max. 400 ns
min. 100 ms
min.
200 s
max. 10 s
min. 200 ns
min.
25 s
max. 250 ms
max.
200 s
min. 250 ms
min. 45 ns
Timing values [ns] (5)
Type
Async Fast-5
min. 90 33
min. 45 17
max. 4 4
min. N/A 70
min. N/A 25
min. N/A 70
min. N/A 15
min. N/A 1.1
max. 8 8
min. N/A 200
min. N/A 80
min. N/A 53
min. N/A 80
min. N/A 23
max. N/A 1
Fast-10 Fast-20 Fast-40
33 21.5
17 8.5
4 3
22 11
25 11.5
22 11
15 6.5
1.1 1.1
8 5
100 50
30 15
33 16.5
30 15
23 11.5
1 1
19.25
6.75
2.5
6.5
4.75
6.5
4.75
1.1
4.5
25
8
9.25
8
9.25
1