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时钟配置了,输出的时钟频率不太对,怎么回事?

asked 2018-11-12 03:00:49 -0600

nick qian gravatar image

updated 2018-12-24 06:59:02 -0600

fae gravatar image

时钟配置了,输出的时钟频率不太对,怎么回事?

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answered 2021-02-24 20:29:46 -0600

fae gravatar image

有几种可能:
1)板上SD卡里面存储有时钟配置,一上电就会自动读取SD里面的配置,而这个配置与你想要的频率不符;拔掉SD卡试试看;
2)时钟腿没有约束成lvds;板上是lvds的,vivado里面约束成SSTL之类的不相匹配的电平标准;
3)时钟腿的termination约束不对,比如板上要求是enable termination,但是vivado里面没有enable(rtl或者xdc);或者反过来;

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Asked: 2018-11-12 03:00:49 -0600

Seen: 762 times

Last updated: Feb 24 '21