dsp56004 Freescale Semiconductor, Inc, dsp56004 Datasheet - Page 33

• Manufacturer Part Number: dsp56004
• Description: Symphonytm Audio Dsp Family 24-bit Digital Signal Processors
• Manufacturer: Freescale Semiconductor, Inc

No.
EXTERNAL MEMORY INTERFACE (EMI) DRAM TIMING
MOTOROLA
41 Page Mode Cycle Time
42 RAS or RD Assertion to
43 CAS Assertion to Data
44 Column Address Valid
45 CAS Assertion to Data
46 RAS Assertion Pulse
47 RAS Assertion Pulse
48 RAS or CAS
49 CAS Assertion Pulse
50 Last CAS Assertion to
51 RAS or WR Assertion to
52 RAS Assertion to CAS
53 RAS Assertion to
Data Valid
Valid
to Data Valid
Active
Width
(Page Mode Access
Only)
Width
(Single Access Only)
Deassertation to RAS
Assertion
Width
RAS Deassertation
(Page Mode Access
Only)
CAS Deassertation
Assertion
Column Address Valid
Characteristics
1
(C
L
= 50 pF + 2 TTL Loads)
Table 2-8 External Memory Interface (EMI) DRAM Timing
Freescale Semiconductor, Inc.
For More Information On This Product,
t
Symbol
RP
t
t
t
t
t
t
t
t
t
t
t
RASP
RAC
t
t
CSH
CWL
t
CAC
RCD
RAD
CLZ
RAS
CAS
RSH
, t
GA
AA
PC
CRP
Go to: www.freescale.com
,
,
Timing
DSP56004/D, Rev. 3
Mode
slow
slow
slow
slow
slow
slow
slow
slow
slow
slow
slow
slow
fast
fast
fast
fast
fast
fast
fast
fast
fast
fast
fast
fast
2
3 T
2
3
3 T
2
Expression
5
3
n
7
2
3
2
7
2
5
3
7
5
4
3
n
3
5
T
4
3
T
T
C
T
C
T
T
T
T
T
T
T
T
T
T
T
T
T
C
T
4
C
C
T
T
13
13
3 T
C
+ T
0
+ T
C
C
C
C
C
C
C
C
C
C
C
C
C
C
External Memory Interface (EMI) DRAM Timing
+ T
C
+ T
C
T
T
– 11 +
–11 +
– 15
– 16
– 10
– 11
– 10
– 15
– 13
– 13
– 16
– 10
– 11
– 10
– 15
– 15
C
C
– 5
– 5
T
L
L
H
H
C
C
– 7
– 7
–
–
Min Max Min Max Min Max
209
149
129
125
50 MHz
80
60
—
—
—
—
—
—
89
95
55
50
30
45
25
85
67
47
57
37
0
124
—
—
84
50
30
63
43
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
156
110
66 MHz
61
46
—
—
—
—
—
—
95
65
70
40
35
20
30
15
91
61
47
32
40
25
0
—
—
90
60
35
20
46
30
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
49.4
37.0
87.8
75.4
50.8
56.7
32.0
27.0
14.7
22.0
71.4
46.7
36.4
30.2
17.9
125
9.7
—
—
—
—
—
—
24
81 MHz
0
Specifications
70.4
45.7
27.0
14.7
36.2
23.8
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Unit
2-9
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns