Figure 18. Data Out Block Transfer - Seagate MEDALIST 1080SL Product Manual

Medalist 1080sl SCSI Product Manual, August 1995
0
DB(7–0,P)–
First byte
1
0
ATN–
1
0
SEL–
1
0
BUSY–
1
0
I/O–
1
0
MSG–
1
0
C/D–
1
0
REQ–
1
0
ACK–
1
T25
T29

Figure 18. Data out block transfer

Description
Data out block transfer (ASYNC)
Next data out byte access
(ASYNC)
Data out byte transfer (SYNC)
Next data out byte access
(SYNC)
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.
Second byte Last byte
T27 T25 T27
T31 T29 T31
Symbol Typical
T25 <0.1 sec
T27 <0.8 sec
T29 <60 nsec
T31 <600 nsec
121
Max
0.2 sec
1.5 sec
100 nsec
1.2 sec