Product manual

Figure 26. Synchronous read timing
Description Symbol Min
I/O low to data bus enable T1 400 nsec
Data bus valid to REQ– low
T2 57.5 nsec
REQ– assertion period T3 30.0 nsec
REQ– deassertion period T4 30.0 nsec
REQ– high to data hold T5 —
REQ– low ACK– low T6 10 nsec
ACK– assertion period T7 30.0 nsec
ACK– deassertion period T8 30.0 nsec
ACK– period T9 100 nsec
Last ACK– pulse high to phase
change
T10 125 nsec
T5
–
DB(7 – 0,P)
T9
T10
T7
T8
T6
T3
T4
T1 T2
1
0
–REQ
–C/D
–MSG
–I/O
–ACK
1
0
1
0
1
0
1
0
1
0
138 ST3655 Family SCSI Drives Product Manual, Rev. A