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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.
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
2.4µs 2.4µs 2.4µs 2.4µs
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 ––