40130064 发表于 2010-4-20 11:10:44

哪位高手帮我分析下这个Q2警告

Warning: Presettable and clearable registers converted to equivalent circuits with latches. Registers power-up to an undefined state, and DEVCLRn places the registers in an undefined state.

这警告在用EPM570时不会出现,但换成EP2C8后综合就会出这个 为什么?
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