DSP56303UM View Datasheet(PDF) - Freescale Semiconductor

Part Name

Description

Manufacturer

DSP56303UM

24-Bit Digital Signal Processor

Freescale Semiconductor 

AC Electrical Characteristics

2.5.5.2 DRAM Timing

The selection guides in Figure 2-14 and Figure 2-17 are for primary selection only. Final selection should be based

on the timing in the following tables. For example, the selection guide suggests that four wait states must be used

for 100 MHz operation with Page Mode DRAM. However, consulting the appropriate table, a designer can evaluate

whether fewer wait states might suffice by determining which timing prevents operation at 100 MHz, running the

chip at a slightly lower frequency (for example, 95 MHz), using faster DRAM (if it becomes available), and

manipulating control factors such as capacitive and resistive load to improve overall system performance.

DRAM type

(tRAC ns)

Note:

This figure should be used for primary selection. For exact

and detailed timings, see the following tables.

100

80

70

60

Chip frequency

50

40

66

80

100

120 (MHz)

1 Wait states

3 Wait states

2 Wait states

4 Wait states

Figure 2-14. DRAM Page Mode Wait State Selection Guide

Freescale Semiconductor

DSP56303 Technical Data, Rev. 11

2-15

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