Seagate ST3285N, Product Manual

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Figure 23. Data out block transfer
Description Symbol Typical Max
Data out block transfer (ASYNC) T25
<0.1
µ
sec 0.2
µ
sec
Next data out byte access
(ASYNC)
T27 <0.8
µ
sec 1.5
µ
sec
Data out byte transfer (SYNC) T29 <60 nsec 100 nsec
Next data out byte access
(SYNC)
T31 <600 nsec 1.2
µ
sec
The maximum SCSI asynchronous interface transfer rate is 5 Mbytes per
second. Therefore, the minimum time between two leading edges of a
request is 200 nsec.
The maximum SCSI synchronous interface transfer rate is 10.0 Mbytes
per second. Therefore, the minimum time between two leading edges of
a request is 100 nsec.
–DB(7–0,P)
–ATN
–SEL
–BUSY
–I/O
–MSG
–C/D
–REQ
–ACK
T25
T29 T27
T31 T25
T29 T27
T31
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
First byte
Second byte Last byte
ST3655 Family SCSI Drives Product Manual, Rev. A 135