
Specifications
External Memory Interface (EMI) DRAM Timing
MOTOROLA
DSP56007/D 2-9
EXTERNAL MEMORY INTERFACE (EMI) DRAM TIMING
(C
L
= 50 pF + 2 TTL Loads)
Table 2-8
External Memory Interface (EMI) DRAM Timing
No.
Characteristics
Symbol
Timing
Mode
Expression
50 MHz
66 MHz
88 MHz
Unit
Min Max Min Max Min Max
41 Page Mode Cycle Time
t
PC
slow
fast
4
×
T
C
3
×
T
C
80
60
—
—
61
46
—
—
45.5
34.1
—
—
ns
ns
42 RAS or RD Assertion to
Data Valid
t
RAC
,
t
GA
slow
fast
7
×
T
C
– 16
5
×
T
C
– 16
—
—
124
84
—
—
90
60
—
—
63.5
40.8
ns
ns
43 CAS Assertion to Data
Valid
T
CAC
slow
fast
3
×
T
C
– 10
2
×
T
C
– 10
—
—
50
30
—
—
35
20
—
—
24.1
12.7
ns
ns
44 Column Address Valid
to Data Valid
t
AA
slow
fast
3
×
T
C
+ T
L
– 7
2
×
T
C
+ T
L
–
7
—
—
63
43
—
—
46
30
—
—
32.8
21.4
ns
ns
45 CAS Assertion to Data
Active
T
CLZ
0
0
—
0
—
0
—
ns
46 RAS Assertion Pulse
Width
1
(Page Mode Access
Only)
t
RASP
slow
fast
3
×
T
C
–11
+ n
×
4
×
T
C
2
×
T
C
–11
+ n
×
3
×
T
C
209
149
—
—
156
110
—
—
114
79.9
—
—
ns
ns
47 RAS Assertion Pulse
Width
(Single Access Only)
t
RAS
slow
fast
7
×
T
C
– 11
5
×
T
C
– 11
129
89
—
—
95
65
—
—
68.5
45.8
—
—
ns
ns
48 RAS or CAS
Deassertation to RAS
Assertion
t
RP
,
T
CRP
slow
fast
5
×
T
C
– 5
3
×
T
C
– 5
95
55
—
—
70
40
—
—
51.8
29.1
—
—
ns
ns
49 CAS Assertion Pulse
Width
T
CAS
slow
fast
3
×
T
C
– 10
2
×
T
C
– 10
50
30
—
—
35
20
—
—
24.1
12.7
—
—
ns
ns
50 Last CAS Assertion to
RAS Deassertation
(Page Mode Access
Only)
t
RSH
slow
fast
3
×
T
C
– 15
2
×
T
C
– 15
45
25
—
—
30
15
—
—
19.1
7.7
—
—
ns
ns
51 RAS or WR Assertion to
CAS Deassertation
T
CSH
,
T
CWL
slow
fast
7
×
T
C
– 15
5
×
T
C
– 15
125
85
—
—
91
61
—
—
64.5
41.8
—
—
ns
ns
52 RAS Assertion to CAS
Assertion
t
RCD
slow
fast
4
×
T
C
– 13
3
×
T
C
– 13
67
47
—
—
47
32
—
—
32.5
21.1
—
—
ns
ns
53 RAS Assertion to
Column Address Valid
t
RAD
slow
fast
3
×
T
C
+ T
H
–
13
2
×
T
C
+ T
H
–
13
57
37
—
—
40
25
—
—
26.8
15.4
—
—
ns
ns
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Freescale Semiconductor, Inc.
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