dsp56362 Freescale Semiconductor, Inc, dsp56362 Datasheet - Page 54

• Manufacturer Part Number: dsp56362
• Description: Dsp56362 24-bit Audio Digital Signal Processor
• Manufacturer: Freescale Semiconductor, Inc

External Memory Expansion Port (Port A)
3-28
No.
157
158
159
160
161
162
163
164
Random read or write cycle time
RAS assertion to data valid (read)
CAS assertion to data valid (read)
Column address valid to data valid (read)
CAS deassertion to data not valid (read hold
time)
RAS deassertion to RAS assertion
RAS assertion pulse width
CAS assertion to RAS deassertion
DRAM Type
(tRAC ns)
100
80
70
50
Table 3-13 DRAM Out-of-Page and Refresh Timings, Four Wait States
60
Characteristics
Figure 3-16 DRAM Out-of-Page Wait States Selection Guide
4 Wait States
8 Wait States
Note: This figure should be use for primary selection. For exact
40
3
66
and detailed timings see the following tables.
80
DSP56362 Technical Data, Rev. 4
100
Symbol
t
t
t
t
t
t
RAC
CAC
t
RSH
t
OFF
RAS
RC
AA
RP
11 Wait States
15 Wait States
120
2.75 × T
1.25 × T
1.75 × T
3.25 × T
1.75 × T
1.5 × T
Expression
5 × T
C
C
C
C
C
C
C
− 7.5
− 7.5
− 7.5
− 4.0
− 4.0
− 4.0
Chip Frequency
(MHz)
250.0
158.5
83.5
83.5
Min
0.0
—
—
—
20 MHz
130.0
Max
55.0
67.5
4
—
—
—
—
—
Freescale Semiconductor
166.7
104.3
54.3
54.3
1, 2
Min
0.0
AA0475
—
—
—
30 MHz
Max
84.2
34.2
42.5
4
—
—
—
—
—
Unit
ns
ns
ns
ns
ns
ns
ns
ns