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DSP56303 Datasheet(PDF) 35 Page - Freescale Semiconductor, Inc

Part # DSP56303
Description  24-Bit Digital Signal Processor
PDF  108 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

DSP56303 Datasheet(HTML) 35 Page - Freescale Semiconductor, Inc

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AC Electrical Characteristics
DSP56303 Technical Data, Rev. 11
Freescale Semiconductor
2-15
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.
Figure 2-14.
DRAM Page Mode Wait State Selection Guide
Chip frequency
(MHz)
DRAM type
(tRAC ns)
100
80
70
60
40
66
80
100
1 Wait states
2 Wait states
3 Wait states
4 Wait states
Note:
This figure should be used for primary selection. For exact
and detailed timings, see the following tables.
50
120



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