參數(shù)資料
型號: DSP56364P
廠商: 飛思卡爾半導體(中國)有限公司
元件分類: 數(shù)字信號處理
英文描述: 24-Bit Audio Digital Signal Processor
中文描述: 24位音頻數(shù)字信號處理器
文件頁數(shù): 40/148頁
文件大小: 1204K
代理商: DSP56364P
External Memory Expansion Port (Port A)
DSP56364 Technical Data, Rev. 4
3-24
Freescale Semiconductor
140
Column address valid to CAS assertion
t
ASC
T
C
4.0
6.0
ns
141
CAS assertion to column address not valid
t
CAH
3.5
×
T
C
4.0
31.0
ns
142
Last column address valid to RAS deassertion
t
RAL
5
×
T
C
4.0
46.0
ns
143
WR deassertion to CAS assertion
t
RCS
1.25
×
T
C
4.0
8.5
ns
144
CAS deassertion to WR assertion
t
RCH
1.25
×
T
C
4.0
8.5
ns
145
CAS assertion to WR deassertion
t
WCH
3.25
×
T
C
4.2
28.3
ns
146
WR assertion pulse width
t
WP
4.5
×
T
C
4.5
40.5
ns
147
Last WR assertion to RAS deassertion
t
RWL
4.75
×
T
C
4.3
43.2
ns
148
WR assertion to CAS deassertion
t
CWL
3.75
×
T
C
4.3
33.2
ns
149
Data valid to CAS assertion (write)
t
DS
0.5
×
T
C
4.0
1.0
ns
150
CAS assertion to data not valid (write)
t
DH
3.5
×
T
C
4.0
31.0
ns
151
WR assertion to CAS assertion
t
WCS
1.25
×
T
C
4.3
8.2
ns
152
Last RD assertion to RAS deassertion
t
ROH
4.5
×
T
C
4.0
41.0
ns
153
RD assertion to data valid
t
GA
3.25
×
T
C
7.0
25.5
ns
154
RD deassertion to data not valid
6
t
GZ
0.0
ns
155
WR assertion to data active
0.75
×
T
C
0.3
7.2
ns
156
WR deassertion to data high impedance
0.25
×
T
C
2.5
ns
1
The number of wait states for Page mode access is specified in the DCR.
2
The refresh period is specified in the DCR.
3
The asynchronous delays specified in the expressions are valid for
DSP56364
.
4
All the timings are calculated for the worst case. Some of the timings are better for specific cases (e.g., t
PC
equals 3
×
T
C
for
read-after-read or write-after-write sequences).
5
BRW[1:0] (DRAM control register bits) defines the number of wait states that should be inserted in each DRAM out-of-page
access.
6
RD deassertion will always occur after CAS deassertion; therefore, the restricted timing is t
OFF
and not t
GZ
.
Table 3-12 DRAM Page Mode Timings, Four Wait States
1, 2, 3
(continued)
No.
Characteristics
Symbol
Expression
4
Min
Max
Unit
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