Seagate ST3285N, Product Manual

Page: 149 / 151

Figure 27. Synchronous write timing
Description Symbol Min Max
I/O high to data bus disable T1 — 50 nsec
REQ– assertion period T2 30.0 nsec —
REQ– deassertion period T3 30.0 nsec —
Data valid to ACK– low T4 — —
ACK– assertion period T5 30.0 nsec —
ACK– deassertion period T6 30.0 nsec —
ACK– low to data hold T7 10 nsec —
ACK– period T8 100 nsec —
REQ– low to ACK– low T9 10 nsec —
Last ACK– pulse high to phase
change
T10 125 nsec —
T1 T10 T5 T6
T7
T8
T9
T2
T3
T4
–DB(7–0,P)
1
0
–ACK
–REQ
–MSG
–C/D
–I/O
1
0
1
0
1
0
1
0
1
0
ST3655 Family SCSI Drives Product Manual, Rev. A 139