每日一奖----20140529

damonzhao · 发表于 2014-5-29 12:31:08

Q18. What is scan chain? What if scan chain not detached and reordered? Is it compulsory?

stheng · 发表于 2014-5-29 14:27:51

a string of register chained together, with one output connects to the next input, so to enable scan shifting during scan mode.

scan reordering is not compulsory BUT is a good practice to do so as the original scan chain is likely not optimized for routing.

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