Quartus中利用FFT的IP核无法仿真出数据波形

jlqamark · 发表于 2011-4-23 16:03:10

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在Quartus中调用FFT的IP核，用的器件是cyclone 3，手册上说3代得ip核是preliminary的，时序仿真有点问题，不知道这是怎么回事。自己用的是streaming的结构，ready，valid，sop，eop也都加了，但是就是没有fft数据出来。仿真时间也足够长，采用64点，512点都试过了，时序仿真的时候报warning：
Warning: Can't display state machine states -- register holding state machine bit "|fft_test|FFT:inst|asj_fft_sglstream_fft_72:asj_fft_sglstream_fft_72_inst|fft_s1_cur.last_input" was synthesized away
Warning: Can't display state machine states -- register holding state machine bit "|fft_test|FFT:inst|asj_fft_sglstream_fft_72:asj_fft_sglstream_fft_72_inst|fft_s1_cur.check_dav" was synthesized away
Warning: Can't display state machine states -- register holding state machine bit "|fft_test|FFT:inst|asj_fft_sglstream_fft_72:asj_fft_sglstream_fft_72_inst|fft_s1_cur.write_input" was synthesized away
Warning: Can't display state machine states -- register holding state machine bit "|fft_test|FFT:inst|asj_fft_sglstream_fft_72:asj_fft_sglstream_fft_72_inst|fft_s1_cur.wait_for_input" was synthesized away
还有好几个这样的warning，不知道大家遇到没有，求高人解答