dsp56004 Freescale Semiconductor, Inc, dsp56004 Datasheet - Page 41

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

No.
EXTERNAL MEMORY INTERFACE (EMI) SRAM TIMING
MOTOROLA
91 Address Valid and CS
92 Address Valid to RD or WR
93 RD or WR Assertion Pulse
94 RD or WR Deassertation to
95 RD or WR Deassertation to
96 Address Valid to Input Data
97 RD Assertion to Input Data
MD0–MD7
Assertion Pulse Width
Assertion
Width
RD or WR Assertion
Address not Valid
Valid
Valid
MRAS
MCAS
Characteristics
(C
L
= 50 pF + 2 TTL Loads)
Data In
Table 2-10 External Memory Interface (EMI) SRAM Timing
Freescale Semiconductor, Inc.
For More Information On This Product,
Figure 2-12 CAS before RAS Refresh Cycle
88
82
81
89
Symbol
t
t
Go to: www.freescale.com
RC
AA
t
t
t
t
WP
—
WR
, t
AS
OE
, t
WC
AC
DSP56004/D, Rev. 3
3
2
4
T
83
2
Expression
2
T
C
Ws
Ws
Ws
Ws
C
T
+ T
T
T
T
H
T
+ T
86
C
C
C
C
– 6
L
– 11 +
– 15 +
– 5 +
T
T
– 11
T
T
L
External Memory Interface (EMI) SRAM Timing
– 13
C
C
C
C
–15 +
84
87
Min Max Min Max Min Max
50 MHz
69
17
35
29
—
—
4
—
—
—
—
—
55
25
66 MHz
50
10
19
—
—
23
2
—
—
—
—
—
38
15
85
38.4
13.7
5.5
0.2
20
—
—
81 MHz
Specifications
28.2
9.7
—
—
—
—
—
AA0266
2-17
Unit
ns
ns
ns
ns
ns
ns
ns