Product manual

Description Symbol Typical Max
Data in block transfer (ASYNC) T24
<0.1 µsec 0.2 µsec
Next data in byte access
(ASYNC)
T26
<0.8 µsec 1.5 µsec
Data in byte transfer (SYNC) T28 <60 nsec 100 nsec
Next data in byte access
(SYNC)
T30 <600 nsec
1.2 µsec
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
T24
T28
T26
T30
T24
T28
T26
T30
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
First byte Second byte Last byte
Figure 22. Data in block transfer
134 ST3655 Family SCSI Drives Product Manual, Rev. A