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As digital systems becomes more complex,it becomes increasingly important to verify the functionality of a design before implementing it in a system,a Test Bench source includes mainly some aspects:
0,set up time scale and operating precision.
1,instantiation
2,Reg and Wire Declarations
3,initial and always(clock,reset)
waring:
4,Printing during simulusation
5,TASK
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原文地址：http://www.cnblogs.com/rrttp/p/5894694.html
