dsp56367 Freescale Semiconductor, Inc, dsp56367 Datasheet - Page 45

• Manufacturer Part Number: dsp56367
• Description: Dsp56367 24-bit Audio Digital Signal Processor
• Manufacturer: Freescale Semiconductor, Inc

Freescale Semiconductor
157
158
159
160
161
162
163
164
No.
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
(t
RAC
100
80
70
50
Table 3-11 DRAM Out-of-Page and Refresh Timings, Four Wait States
60
ns)
Characteristics
Figure 3-14 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
66
and detailed timings see the following tables.
DSP56367 Technical Data, Rev. 2.1
80
100
Symbol
t
t
t
t
t
t
RAC
CAC
OFF
t
RAS
RSH
t
RC
AA
RP
11 Wait States
15 Wait States
2.75 × T
1.25 × T
1.75 × T
3.25 × T
1.75 × T
1.5 × T
120
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)
External Memory Expansion Port (Port A)
250.0
158.5
83.5
83.5
Min
0.0
—
—
—
20 MHz
130.0
Max
55.0
67.5
3
—
—
—
—
—
166.7
104.3
1, 2
54.3
54.3
Min
AA0475
0.0
—
—
—
30 MHz
84.2
34.2
42.5
Max
3
—
—
—
—
—
Unit
ns
ns
ns
ns
ns
ns
ns
ns
3-21