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LAUNCHXL-F280049C: 从FLASH至GxRAM的memcpy慢

Part Number: LAUNCHXL-F280049C

我在进行数据搬运的时候遇到如下问题:

通过string.h的memcpy接口进行FLASH到GxRAM的数据搬运,FLASH的cache与预取打开,RWAIT值设置为4,发现搬运数据所用cycle数(100MHZ时钟)约为PREAD指令(memcpy编译汇编主要指令)周期数的5倍,且关闭cache与预取对结果并不产生影响;

上述现象是什么原因造成的呢?

此时的搬运速度是否可以通过其他方法进行提升?

期待各位的回复,谢谢!