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C6747库函数dsplib执行时间问题



C6747的IFFT库函数,手册提供了在C674x CPU Cycle Accurate Simulator模式下测出的执行时钟周期,而我在实际的开发板上运行调试时采用Profile的clock功能测出的时间却是手册上参考时间的60多倍,这是什么原因导致实际运行时间这么慢呢?代码和数据都是存储在SDRAM中,SDRAM的读写速度不会是L1 cache的60多倍吧?还有L2 cache的读写速度是多少?怎么启动L1和L2 cache功能?