Z5380 Datasheet, PDF (29/37 Pages) Zilog, Inc. – SMALL COMPUTER SYSTEM INTERFACE (SCSI)

ZILOG
AC CHARACTERISTICS
DMA Read (Non-Block Mode) Initiator Receive Cycle Table
No Description
Min
1
DRQ Low from /DACK Low
130
2
/DACK High to DRQ High
30
3
/DACK Hold Time from End of /IOR
0
4
Data Access Time from Read Enable ^[1]
115
5
Data Hold Time from End of /IOR
20
6
Width of /EOP Pulse ^[2]
100
7
/REQ Low to DRQ High
20
8
/DACK High to /ACK High (/REQ High)
25
9
/REQ Low to /ACK Low
20
10 /REQ High to /ACK High (/DACK High)
15
11 Data Setup Time to /REQ
20
12 Data Hold Time from /REQ
50
Notes:
[1] Read Enable is the occurrence of /IOR and /DACK.
[2] /EOP, /IOR, and /DACK must be concurrently Low for at least T6 for proper recognition of the /EOP pulse.
Z5380 SCSI
Max
Units
ns
ns
ns
ns
ns
ns
ns
160
ns
160
ns
140
ns
ns
ns
PS97SCC0100
PS009101-0201
29