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Warning: Comparison with unknown, don't care or tristate will always be false, may cause simulation and synthesis mismatch
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 Error: RTL interpretation messages were produced during link.
 Verification results may disagree with a logic simulator. (FM-089)
 Error: Failed to set top design to 'r:/WORK/can_core' (FM-156)
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 所以得底层模块都可以matche,而最后到了顶层模块竟出现这个问题,看错误说明是因为代码风格的问题,可以底层的模块都没问题,顶层模块只是调用这些模块,为什么会出现这个问题。
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