參數(shù)資料
型號: SPAKD56366PV120
廠商: MOTOROLA INC
元件分類: 數(shù)字信號處理
英文描述: 24-BIT, 120 MHz, OTHER DSP, PQFP144
封裝: TQFP-144
文件頁數(shù): 94/147頁
文件大小: 2156K
代理商: SPAKD56366PV120
2-20
DSP56366 Advance Information
MOTOROLA
Specifications
External Memory Expansion Port (Port A)
Table 2-9 DRAM Page Mode Timings, One Wait State (Low-Power Applications)1, 2, 3
No.
Characteristics
Symbol
Expression
20 MHz6
30 MHz6
Unit
Min
Max
Min
Max
131
Page mode cycle time for two
consecutive accesses of the same
direction
tPC
2
× TC
100.0
66.7
ns
Page mode cycle time for mixed
(read and write) accesses
1.25
× TC
62.5
41.7
132
CAS assertion to data valid (read)
tCAC
TC 7.5
42.5
25.8
ns
133
Column address valid to data
valid (read)
tAA
1.5
× TC 7.5
67.5
42.5
ns
134
CAS deassertion to data not valid
(read hold time)
tOFF
0.0
0.0
ns
135
Last CAS assertion to RAS
deassertion
tRSH
0.75
× TC 4.0
33.5
21.0
ns
136
Previous CAS deassertion to RAS
deassertion
tRHCP
2
× TC 4.0
96.0
62.7
ns
137
CAS assertion pulse width
tCAS
0.75
× TC 4.0
33.5
21.0
ns
138
Last CAS deassertion to RAS
deassertion4
BRW[1:0] = 00
tCRP
1.75
× TC 6.0
81.5
52.3
ns
BRW[1:0] = 01
3.25
× TC 6.0
156.5
102.2
ns
BRW[1:0] = 10
4.25
× TC 6.0
206.5
135.5
ns
BRW[1:0] = 11
6.25
× TC – 6.0
306.5
202.1
ns
139
CAS deassertion pulse width
tCP
0.5
× TC 4.0
21.0
12.7
ns
140
Column address valid to CAS
assertion
tASC
0.5
× TC 4.0
21.0
12.7
ns
141
CAS assertion to column address
not valid
tCAH
0.75
× TC 4.0
33.5
21.0
ns
142
Last column address valid to RAS
deassertion
tRAL
2
× TC 4.0
96.0
62.7
ns
143
WR deassertion to CAS assertion
tRCS
0.75
× TC 3.8
33.7
21.2
ns
144
CAS deassertion to WR assertion
tRCH
0.25
× TC 3.7
8.8
4.6
ns
145
CAS assertion to WR deassertion
tWCH
0.5
× TC 4.2
20.8
12.5
ns
146
WR assertion pulse widt
h
tWP
1.5
× TC 4.5
70.5
45.5
ns
147
Last WR assertion to RAS
deassertion
tRWL
1.75
× TC 4.3
83.2
54.0
ns
148
WR assertion to CAS deassertion
tCWL
1.75
× TC 4.3
83.2
54.0
ns
149
Data valid to CAS assertion
(Write)
tDS
0.25
× TC 4.0
8.5
4.3
ns
150
CAS assertion to data not valid
(write)
tDH
0.75
× TC 4.0
33.5
21.0
ns
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