Z80181 Datasheet, PDF (62/74 Pages) Zilog, Inc. – SMART ACCESS CONTROLLER (SAC™)

Zilog
AC CHARACTERISTICS (Continued)
SCC Timing
Figure 70 shows the AC characteristics for the on-chip
SCC. Parameters referenced in this figure appear in
Table C.
Ø
Z80181
SMART ACCESS CONTROLLER SAC^™
/WR
/RD
/W//REQ
Wait
/W//REQ
Request
/DTR//REQ
Request
/INT
1
2
3
4
5
6
Figure 70. SCC AC Parameters
Table C. SCC Timing Parameters (85C30 AC Characteristics)
No Symbol
Parameter
Z8018110
Min
Max
1
TdWR(W)
/WR Fall to Wait Valid Delay
2
TdWR(W)
/RD Fall to Wait Valid Delay
3
TdWRf(REQ) /WR Fall to /W//REQ Not Valid Delay
4
TdRDf(REQ) /RD Fall to /W//REQ Not Valid Delay
180 + TcC
180
180 + TcC
180
5
TdWRr(REQ) /WR Rise to /DTR//REQ Not Valid Delay
6
TdPC(INT)
Clock to /INT Valid Delay
7
TdRDA(INT)
/M1 Fall to /INT Inactive Delay
Note for Table C:
[C1] Open-drain output, measured with open-drain test load.
5TcC
500
TBS
Unit Note
ns
[C1]
ns
[C1]
ns
ns
ns
ns
[C1]
ns
[C1]
2-62
DS971800500