參數資料
型號: DSP56367UM
廠商: 飛思卡爾半導體(中國)有限公司
元件分類: 數字信號處理
英文描述: 24-Bit Audio Digital Signal Processor
中文描述: 24位音頻數字信號處理器
文件頁數: 39/100頁
文件大小: 1039K
代理商: DSP56367UM
External Memory Expansion Port (Port A)
DSP56367 Technical Data, Rev. 2.1
Freescale Semiconductor
3-15
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
(t
RAC
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 use for primary selection. For
exact and detailed timings see the following tables.
AA0472
50
120
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