Fujitsu MCM3130SS Manuale Utente
7.5 Timing Rule
C156-E228-02EN 7-17
Table 7.7 Timing specifications (3 of 3)
No. Name
Standard
Timing
specification
17
Transfer Period
50 ns
In synchronous data transfer mode, the minimum time
(minimum repetition time) from the leading edge of an
REQ signal to the leading edge of the next REQ signal
or from the leading edge of an ACK signal to the
leading edge of the next ACK signal. The actual value
is defined using a SYNCHRONOUS DATA
TRANSFER REQUEST message exchanged between
the INIT and TARG.
(minimum repetition time) from the leading edge of an
REQ signal to the leading edge of the next REQ signal
or from the leading edge of an ACK signal to the
leading edge of the next ACK signal. The actual value
is defined using a SYNCHRONOUS DATA
TRANSFER REQUEST message exchanged between
the INIT and TARG.
Table 7.8 SCSI BUS Timing specifications
Synchronous data transfer mode
No. Name
Fast-20 Fast-SCSI SCSI-1
Asynchronous
data transfer
mode
1 Arbitration
Delay
2.4
µ
s 2.4
µ
s 2.4
µ
s 2.4
µ
s
2
Bus
Clear
Delay
800ns 800ns 800ns 800ns
3
Bus Free Delay
800ns
800ns
800ns
800ns
4
Bus
Settle
Delay
400ns 400ns 400ns 400ns
5
Cable Skew Delay
3ns
4ns
4ns
4ns
6
Data Release Delay
400ns
400ns
400ns
400ns
7
Receive
Assertion
Period
11ns 22ns 70ns
––
8
Receive Hold Time
11.5ns
25ns
25ns
––
9
Receive
Negation
Period
11ns 22ns 70ns
––
10
Receive Setup Time
6.5ns
15ns
15ns
––
11
Reset
Hold
Time
25ns 25ns 25ns 25ns
12
Selection Abort Time
200ns
200ns
200ns
200ns
13
Selection
Time-out
Delay
250ns 250ns 250ns 250ns
14
System
Deskew
Delay
15ns 20ns 45ns 45ns
15 Transfer
Period
during
Synchronous Data Transfer Phases
50ns 100ns 200ns
––
16
Transmit Assertion Period
15ns
30ns
80ns
––
17 Transmit
Hold
Time
16.5ns
33ns
53ns
––
18
Transmit Negation Period
15ns
30ns
80ns
––
19
Transmit Setup Time
11.5ns
23ns
23ns
––