3.10
EXTERNAL MEMORY EXPANSION PORT (PORT A)
3.10.1
SRAM TIMING
Table 3-8 SRAM Read and Write Accesses
No.
Characteristics
100
Address valid and AA assertion pulse width
101
Address and AA valid to WR assertion
102
WR assertion pulse width
103
WR deassertion to address not valid
104
Address and AA valid to input data valid
MOTOROLA
External Memory Expansion Port (Port A)
Symbol
Expression
(WS + 1) × T
t
, t
RC
WC
[1 ≤ WS ≤ 3]
(WS + 2) × T
[4 ≤ WS ≤ 7]
(WS + 3) × T
[WS ≥ 8]
0.25 × T
t
AS
[WS = 1]
1.25 × T
[WS ≥ 4]
1.5 × T
− 4.0 [WS = 1]
t
WP
C
All frequencies:
WS × T
[2 ≤ WS ≤ 3]
(WS − 0.5) × T
[WS ≥ 4]
0.25 × T
t
WR
[1 ≤ WS ≤ 3]
1.25 × T
[4 ≤ WS ≤ 7]
2.25 × T
[WS ≥ 8]
All frequencies:
1.75 × T
2.25 × T
[WS ≥ 8]
(WS + 0.75) × T
t
, t
AA
AC
[WS ≥ 1]
DSP56367
Specifications
1
Min
Max
− 4.0
12.0
—
C
− 4.0
46.0
—
C
− 4.0
87.0
—
C
− 2.0
0.1
—
C
− 2.0
8.4
—
C
8.5
—
12.7
—
− 4.0
C
19.0
—
C
− 2.0
0.1
—
C
− 2.0
8.4
—
C
14.7
—
C
12.0
—
C
14.7
—
C
− 7.0
—
7.6
C
Uni
t
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
3-17