插入扫描链时如何处理ROM、RAM、ARM等模块

sendfast2008 · 发表于 2010-8-13 12:09:38

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1、用DFT compiler插入扫描链时，ROM RAM ARM等模块需要作特殊处理吗？
放着不管会有问题吗？

2、用TMax作ATPG，生成的STIL文档中有X状态，会有什么问题吗？

3、做扫描仿真时，遇到时序问题该如何解决（用DC综合时没有时序问题）

这是困扰很久的问题，希望大家给点意见

zh123456789 · 发表于 2010-8-13 16:38:26

同问,
DC不也可以做DFT吗？

juniper14211 · 发表于 2010-8-14 02:55:40

1 Ram and ROm are treated as black boxes
You don't have to do anything.
If you like to have high coverage, you have to build the wrapper for them to get good coveage.

2. X in STIL is normal, nothing wrong about that.

3. ATPG don't care the timing issue.
Without SDF, you have to make sure all combitional logic are 0 delay and have seqential cell with some delay to check the ATPG pattern.