dsp56367 Freescale Semiconductor, Inc, dsp56367 Datasheet - Page 39

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

3.10.2
The selection guides provided in
Final selection should be based on the timing provided in the following tables. As an example, the selection
guide suggests that 4 wait states must be used for 100 MHz operation when using Page Mode DRAM.
However, by using the information in the appropriate table, a designer may choose to evaluate whether
fewer wait states might be used by determining which timing prevents operation at 100 MHz, running the
chip at a slightly lower frequency (e.g., 95 MHz), using faster DRAM (if it becomes available), and control
factors such as capacitive and resistive load to improve overall system performance.
Freescale Semiconductor
DRAM Type
DRAM Timing
(t
RAC
100
80
70
60
50
ns)
Figure 3-11 DRAM Page Mode Wait States Selection Guide
1 Wait States
2 Wait States
40
Note: This figure should be use for primary selection. For
Figure 3-11
66
DSP56367 Technical Data, Rev. 2.1
exact and detailed timings see the following tables.
80
and
Figure 3-14
100
3 Wait States
4 Wait States
120
should be used for primary selection only.
Chip Frequency
(MHz)
External Memory Expansion Port (Port A)
AA0472
3-15