
37
2, 6
3, 4, 5, 7
6
2
2, 6
7, 8
6, 9
3, 4, 5, 7
6
6, 9
7, 8, 9
3, 4, 5, 7
6
3, 4, 5, 7
2, 6
MAX
TYP
MIN
UNITS
MAX
TYP
MIN
DESCRIPTION
REF
4.4
155
555
655
138
430
2.8
3.7
35
27
62
45
61
44
40
0
40
0
40
∞
40
0
25
355
35
165
150
135
265
250
235
205
187.5
170
30
23
11
315
300
285
30
15
40
12
16
10
2.2
105
15
NOTES
2, 9
2, 6
117
s
4.4
(contended access, with ENHANCED CPU SELECT = “0” @ 10 MHz)
ns
150
(uncontended access @ 10 MHz)
ns
550
(contended access, with ENHANCED CPU SELECT = “1” @ 12 MHz)
ns
650
(contended access, with ENHANCED CPU SELECT = “1” @ 10 MHz)
ns
133
(uncontended access @ 12 MHz)
ns
425
(contended acces, with ENHANCED CPU SELECT = “1” s @ 16 MHz)
s
2.8
(contended access, with ENHANCED CPU SELECT = “0” @ 16 MHz)
s
3.7
(contended access, with ENHANCED CPU SELECT = “0” @ 12 MHz)
ns
40
@ 10 MHz
t3
t4
ns
32
@ 12 MHz
ns
67
@ 10 MHz
ns
50
@ 12 MHz
ns
71
@ 10 MHz
ns
54
@ 12 MHz
ns
40
CLOCK IN rising edge delay to output data valid
t19
ns
0
STRBD high hold time from READYD rising
t18
ns
40
STRBD rising delay to output data tri-state
t17
ns
0
Output Data hold time following STRBD rising edge
t16
ns
30
STRBD rising edge delay to IOEN rising edge and READYD rising edge
t15
ns
∞
READYD falling to STRBD rising release time
t14
ns
40
CLOCK IN rising edge delay to READYD falling
t13
t12
ns
0
SELECT hold time following IOEN falling
t6
ns
30
@ 16 MHz
ns
350
(contended access, with ENHANCED CPU SELECT = “1” @ 20 MHz)
ns
30
Address valid setup time prior to CLOCK IN rising edge
t9
ns
165
150
135
IOEN falling delay to READYD falling (@ 20 MHz)
ns
265
250
235
@ 12 MHz
ns
205
187.5
170
@ 16 MHz
ns
30
MEM/REG, RD/WR hold time following CLOCK IN falling edge
t8
ns
33
@ 16 MHz
ns
21
Output Data valid prior to READYD falling (@ 20 MHz)
ns
315
300
285
@ 10 MHz
ns
30
Address hold time following CLOCK IN rising edge
t10
t11
ns
10
MEM/REG, RD/WR setup time prior to CLOCK IN falling edge
t7
ns
40
t5
ns
17
Time for Address to become valid following SELECT and STRBD low (@ 20 MHz)
ns
21
@ 16 MHz
ns
15
Time for MEM/REG and RD/WR to become valid following SELECT and STRBD
low(@ 20 MHz)
s
2.2
(contended access, with ENHANCED CPU SELECT = “0” @ 20 MHz)
ns
100
SELECT and STRBD low to IOEN low (uncontended access @ 20 MHz)
t2
ns
10
SELECT and STRBD low setup time prior to clock rising edge
t1
3.3V LOGIC
5V LOGIC
TABLE FOR FIGURE 13. CPU READING RAM OR REGISTERS (SHOWN FOR 16-BIT, BUFFERED, NONZERO WAIT MODE)
ns
112
(uncontended access @ 16 MHz)