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): 105/147頁
文件大小: 2156K
代理商: SPAKD56366PV120
2-30
DSP56366 Advance Information
MOTOROLA
Specifications
External Memory Expansion Port (Port A)
189
CAS assertion to RAS assertion
(refresh)
tCSR
0.5
× TC 4.0
21.0
12.7
ns
190
RAS deassertion to CAS assertion
(refresh)
tRPC
1.25
× TC 4.0
58.5
37.7
ns
191
RD assertion to RAS deassertion
tROH
4.5
× TC 4.0
221.0
146.0
ns
192
RD assertion to data valid
tGA
4
× TC 7.5
192.5
125.8
ns
193
RD deassertion to data not valid3
tGZ
0.0
0.0
ns
194
WR assertion to data active
0.75
× TC 0.3
37.2
24.7
ns
195
WR deassertion to data high
impedance
0.25
× TC
12.5
8.3
ns
Notes:
1.
The number of wait states for out of page access is specified in the DCR.
2.
The refresh period is specified in the DCR.
3.
RD deassertion will always occur after CAS deassertion; therefore, the restricted timing is tOFF and not tGZ.
4.
Reduced DSP clock speed allows use of DRAM out-of-page access with four Wait states (See
Figure 2-17.).
Table 2-14 DRAM Out-of-Page and Refresh Timings, Eight Wait States1, 2
No.
Characteristics4
Symbol
Expression3
66 MHz
80 MHz
Unit
Min
Max
Min
Max
157 Random read or write cycle time
tRC
9
× TC
136.4
112.5
ns
158 RAS assertion to data valid (read)
tRAC
4.75
× TC 7.5
64.5
ns
4.75
× TC 6.5
52.9
ns
159 CAS assertion to data valid (read)
tCAC
2.25
× TC 7.5
26.6
ns
2.25
× TC 6.5
21.6
ns
160 Column address valid to data valid
(read)
tAA
3
× TC 7.5
40.0
ns
3
× TC 6.5
31.0
ns
161 CAS deassertion to data not valid
(read hold time)
tOFF
0.0—0.0
ns
162 RAS deassertion to RAS assertion
tRP
3.25
× TC 4.0
45.2
36.6
ns
163 RAS assertion pulse width
tRAS
5.75
× TC 4.0
83.1
67.9
ns
164 CAS assertion to RAS deassertion
tRSH
3.25
× TC 4.0
45.2
36.6
ns
165 RAS assertion to CAS deassertion
tCSH
4.75
× TC 4.0
68.0
55.5
ns
166 CAS assertion pulse width
tCAS
2.25
× TC 4.0
30.1
24.1
ns
167 RAS assertion to CAS assertion
tRCD
2.5
× TC ± 2
35.9
39.9
29.3
33.3
ns
168 RAS assertion to column address
valid
tRAD
1.75
× TC ± 2
24.5
28.5
19.9
23.9
ns
Table 2-13 DRAM Out-of-Page and Refresh Timings, Four Wait States1, 2 (Continued)
No.
Characteristics3
Symbol
Expression
20 MHz4
30 MHz4
Unit
Min
Max
Min
Max
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