Motorola DSP56367 User Manual page 99

DRAM Type
(t ns)
RAC
100
80
70
60
50
Figure 3-14 DRAM Out-of-Page Wait States Selection Guide
Table 3-13 DRAM Out-of-Page and Refresh Timings, Four Wait States
No.
Characteristics
157 Random read or write cycle time
158 RAS assertion to data valid (read)
159 CAS assertion to data valid (read)
160 Column address valid to data valid
(read)
161 CAS deassertion to data not valid (read
hold time)
162 RAS deassertion to RAS assertion
MOTOROLA
Note:This figure should be use for primary selection. For
exact and detailed timings see the following tables.
40 66 80
4 Wait States
8 Wait States
3
Symbol Expression
t
RC
2.75 × T
t
RAC
1.25 × T
t
CAC
1.5 × T
t
AA
t
OFF
1.75 × T
t
RP
DSP56367
External Memory Expansion Port (Port A)
Chip Frequency
(MHz)
120
100
11 Wait States
15 Wait States
4
20 MHz
Min Max
5 × T
250.0 —
C
− 7.5
— 130.0
C
− 7.5
— 55.0
C
− 7.5
— 67.5
C
0.0 —
− 4.0
83.5 —
C
Specifications
AA047
4
30 MHz
Unit
Min Max
166.7 — ns
— 84.2 ns
— 34.2 ns
— 42.5 ns
0.0 — ns
54.3 — ns
3-33