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6678 fft运行时间问题



各位专家:

         请问TSCL的cycle是时钟周期还是指令周期。我测试1024点的fft,tscl=10997,而用Timestamp_get32:

ts1 = (Int32) Timestamp_get32();

DSPF_sp_fftSPxSP(N, &ptr_match_in[0], &ptr_w[0], ptr_match_fft, brev, rad, 0, N);

ts2 = (Int32) Timestamp_get32();
ts2 = ts2 - ts1;
*processing_time = ((double)ts2 / (double)freq.lo) * 1000;

得出processing_time=8418384,请问到底那个是时间,时钟是默认的1G。