我只知道跟主频有关,跟寄存器配置有关,但是具体计算方法是什么呢
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CE的时序你可以看一下vc5509A数据手册上第93页的EMIF时序图
CE开始于setup time, 终止于hold time.
http://www.ti.com/lit/ds/symlink/tms320vc5509a.pdf
请问是读写都有这个现象么?
看一下WPE位有没有使能?
DMA的话,一有数据EMIF马上会写。而CPU的话,如果WPE没有使能,则要等上一个数据写到外部memory后才会去写下一个数据。具体看下面文档的描述。
1.7 Write Posting: Buffering Writes to External Memory
http://www.ti.com/lit/ug/spru670a/spru670a.pdf