DSP56367P View Datasheet(PDF) - Freescale Semiconductor

Part Name

Description

Manufacturer

DSP56367P

24-Bit Audio Digital Signal Processor

Freescale Semiconductor 

External Memory Expansion Port (Port A)

3.10.2 DRAM Timing

The selection guides provided in Figure 3-11 and Figure 3-14 should be used for primary selection only.

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.

DRAM Type

(tRAC ns)

Note: This figure should be use for primary selection. For

exact and detailed timings see the following tables.

100

80

70

60

50

Chip Frequency

40

66

80

100 120 (MHz)

1 Wait States

2 Wait States

3 Wait States

4 Wait States

Figure 3-11 DRAM Page Mode Wait States Selection Guide

AA0472

Freescale Semiconductor

DSP56367 Technical Data, Rev. 2.1

3-15

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