Figure 17. Data In Block Transfer - Seagate MEDALIST 1080SL Product Manual

120 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

Figure 17. Data in block transfer

Description
Data in block transfer (ASYNC)
Next data in byte access
(ASYNC)
Data in byte transfer (SYNC)
Next data in 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
T24 T26 T24 T26
T28 T30 T28 T30
Symbol Typical
T24 <0.1 sec
T26 <0.8 sec
T28 <60 nsec
T30 <600 nsec
Last byte
Max
0.2 sec
1.5 sec
100 nsec
1.2 sec