Figure 9. Command Descriptor Block Transfer - Seagate MEDALIST 1080SL Product Manual

112 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
T22

Figure 9. Command descriptor block transfer

Description
Command byte transfer
Next command byte
access *
* T23 is used, except for byte 7 of a 10-byte CDB. A 6-byte CDB requires
less than 5 sec for five T23 occurrences. A 10-byte CDB requires
less than 110 sec for nine occurrences.
Second byte
T23 T22 T23
Symbol Typical
T22 <0.08 sec
T23 <6.5 sec
Last byte
Max
0.15 sec
1.0 sec