DSP56366 datasheet(42/110 Pages) FREESCALE

номер детали	DSP56366

подробное описание детали	24-Bit Audio Digital Signal Processor

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DSP56366 Technical Data, Rev. 3.1

3-16

Freescale Semiconductor

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.

Figure 3-11 DRAM Page Mode Wait States Selection Guide

Chip Frequency

(MHz)

DRAM Type

(tRAC ns)

100

1 Wait States

2 Wait States

3 Wait States

4 Wait States

Notes This figure should be use for primary selection. For

exact and detailed timings see the following tables.

AA0472

120

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