Z53C80 Datasheet, PDF (29/40 Pages) Zilog, Inc. – SMALL COMPUTER SYSTEM INTERFACE (SCSI)

ZILOG
AC CHARACTERISTICS
DMA Read (Non-Block Mode) Initiator Receive Table
Name
Description
Min
1
DRQ False from /DACK True
2
/DACK False to DRQ True
30
3
/DACK Hold Time from End of /IOR
0
4
Data Access Time from Read Enable ^[1]
5
Data Hold Time from End of /IOR
10
6
Width of /EOP Pulse ^[2]
50
7
/REQ True to DRQ True
8
/REQ True to /ACK True
9
/REQ False to /ACK False (/DACK False)
10
/DACK False to /ACK False (/REQ False)
11
DATA Setup Time to /REQ
20
12
DATA Hold Time from /REQ True
50
Notes:
[1] Read enable is the occurrence of both /IOR and /DACK.
[2] /EOP, /IOR and /DACK must be concurrently true for at least T6 for
proper recognition of the /EOP pulse.
Max
60
70
70
90
80
90
Z53C80 SCSI
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
PS97SCC0200
29