经典IC设计面试问题9

yanzhang98 · 发表于 2010-11-28 04:26:06

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Casex,z difference,which is preferable,why?

CASEZ :
Special version of the case statement which uses a Z logic value to represent don't-care bits. CASEX :
Special version of the case statement which uses Z or X logic values to represent don't-care bits.

CASEZ should be used for case statements with wildcard don抰 cares, otherwise use of CASE is required; CASEX should never be used.
This is because:
Don抰 cares are not allowed in the "case" statement. Therefore casex or casez are required. Casex will automatically match any x or z with anything in the case statement. Casez will only match z抯 -- x抯 require an absolute match.

mtwumtwu · 发表于 2010-11-28 17:45:49

good information !!!

xiaoxiaoshi · 发表于 2011-1-20 20:36:41

恩，实际有点用

evistera · 发表于 2011-6-13 19:52:45

youxie yong ,neng geng xiang xi hui geng hao ,xiexie sir

qqwang106 · 发表于 2011-6-14 22:02:11

嗯，谢谢分享

tomzhuo · 发表于 2011-6-16 09:59:01

谢谢分享

lingmufeng · 发表于 2011-6-18 18:40:40

youxie yong ,neng geng xiang xi hui geng hao ,xiexie sir
evistera 发表于 2011-6-13 19:52

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[招聘] 经典IC设计面试问题9

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