關于競爭冒險：

1.use +race utility to locate race condition code ****

2.use $vcdplusdeltacycleon to locate race condition code（不常用）

3.use vcddiff & vcat t locate race condition code （不常用）

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Causes of simulation mismatches

1.functional simulation mismatches:

? ?1.1 different simulator vendors:

? ? race condition in source code **

? ? vendor implementation

? ?1.2different version of simulator from same vendor

? ? ?race condition in source code

?2.RTL-gate mismatches: *********

? ? 2.1 same simulator

? ? ? race condition in source code***(最多)

? ? ? poor code style**

? ?出現競爭冒險：

? ? ?1.代碼不規范比如有若干正確結果，code過于模糊

? ? ? 2.同時write/read同一個data（using and setting a value at the same time）

? ? ?3.競爭冒險會到時不期望的結果，綜合之前解決掉

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?Coding Rules of Thumb

1.synchronous blocks drive only with non-blocking assignments

2.combinatorial and initial blocks drive only with blocking assignment

3.don't drive regs from multiple blocks

4.be careful with the interaction of continous assignments and procedural blocks?

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debugging race conditions:

1.enable with compile switch +race (主要用這個)

2.其他的用的不多，主要靠人的知識經驗不是工具。

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轉載于:https://www.cnblogs.com/chip/p/4781789.html

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