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6.13 AC ELECTRICAL SPECIFICATIONS - CHIP-SELECT TIMING
EXTERNAL MASTER
(see Figure 6-11)
16MHz
Num.
Characteristic
Symbol
Min
Max
154
Clock Low to DTACK Low 11-6 Wait States)
tcLDTKL
-
30
160
AS Low to CS Low
tASLCSL
-
30
161
AS High to CS High
tASHCSH
-
30
162
Address Valid to AS Low
tAVASL
15
-
163
R/W Valid to AS Low (see Note 1)
lRWVASL
15
-
164
AS Negated to Address Hold Time
!ASHA/
0
-
165
AS Low to DTACK Low (0 Wait State)
IASLDTKL
-
45
167
AS High to DTACK High
tASHDTKH
-
30
168
AS Low to BERR Low
tASLBERL
-
30
169
AS High to BERR High
fASHBERH
-
30
NOTE:
1. The minimum value must be met to guarantee write protection operation.
6.14 AC ELECTRICAL SPECIFICATIONS - PARALLEL 1/0
(see Figure 6-12)
16 MHz
Num.
Characteristic
Symbol
Min
Max
180
Input Data Setup Time (to Clock Low)
tDsu
20
-
181
Input Data Hold Time (from Clock Low)
tDH
10
-
182
Clock High to Data out Valid (CPU Writes Data, Control, or Direction)
tcHDOV
-
35
MOTOROLA
MC68302 USER'S MANUAL
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Unit
ns
ns
ns
6-19
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