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28335 CFFT时间问题



 从文档 C28X-FPU-LIB-UG.pdf P14的表可以知道FFTSize=512时,时间为24249 cycle count,系统时钟为150MHZ,即6.67ns, 24249*6.67ns=161.74us,与实测时间(10ms)相差较大,是哪里理解错了,还是什么原因?