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DSP56004UM/AD bảng dữ liệu(PDF) 41 Page - Freescale Semiconductor, Inc

tên linh kiện DSP56004UM/AD
Giải thích chi tiết về linh kiện  SYMPHONY AUDIO DSP FAMILY 24-BIT DIGITAL SIGNAL PROCESSORS
PDF  82 Pages
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nhà sản xuất  FREESCALE [Freescale Semiconductor, Inc]
Trang chủ  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

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



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