Table 3-10 DRAM Page Mode Timings, Two Wait States (Continued)
No.
Characteristics
132
CAS assertion to data valid
(read)
133
Column address valid to data
valid (read)
134
CAS deassertion to data not
valid (read hold time)
135
Last CAS assertion to RAS
deassertion
136
Previous CAS deassertion to
RAS deassertion
137
CAS assertion pulse width
138
Last CAS deassertion to RAS
5
deassertion
•
BRW[1:0] =
00
•
BRW[1:0] =
01
•
BRW[1:0] =
10
•
BRW[1:0] =
11
139
CAS deassertion pulse width
140
Column address valid to CAS
assertion
141
CAS assertion to column
address not valid
142
Last column address valid to
RAS deassertion
143
WR deassertion to CAS
assertion
144
CAS deassertion to WR
assertion
MOTOROLA
External Memory Expansion Port (Port A)
Symbol
Expression
1.5 × T
− 7.5
t
CAC
C
1.5 × T
− 6.5
C
2.5 × T
− 7.5
t
AA
C
2.5 × T
− 6.5
C
t
OFF
1.75 × T
− 4.0
t
RSH
C
3.25 × T
− 4.0
t
RHCP
C
1.5 × T
− 4.0
t
CAS
C
2.0 × T
− 6.0
t
CRP
C
3.5 × T
− 6.0
C
4.5 × T
− 6.0
C
6.5 × T
− 6.0
C
1.25 × T
− 4.0
t
CP
C
− 4.0
t
T
ASC
C
1.75 × T
− 4.0
t
CAH
C
3 × T
− 4.0
t
RAL
C
1.25 × T
− 3.8
t
RCS
C
0.5 × T
− 3.7
t
RCH
C
DSP56367
Specifications
66 MHz
80 MHz
Min
Max
Min
Max
—
15.2
—
—
—
—
—
12.3
—
30.4
—
—
—
—
—
24.8
0.0
—
0.0
—
22.5
—
17.9
—
45.2
—
36.6
—
18.7
—
14.8
—
24.4
—
19.0
—
47.2
—
37.8
—
62.4
—
50.3
—
92.8
—
75.3
—
14.9
—
11.6
—
11.2
—
8.5
—
22.5
—
17.9
—
41.5
—
33.5
—
15.1
—
11.8
—
3.9
—
2.6
—
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
3-25