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Difference between Guidelines , Analog and Recommended rules in TSMC 28nm DRC deck

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Sanketp20

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Hi,

I am looking at 28nm DRC deck and for DFM rules, I see different sections like "Recommended" , "Guidelines" , "Analog" etc.
What is the difference between these sections ? Specifically what is the difference between "Recommended" and "Guidelines" ? I appreciate your insight on this.

Thanks
sam
 

Sanketp20 said:
Specifically what is the difference between "Recommended" and "Guidelines"?
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I'd think "Guidelines" characterizes the min. rules for DFM, whereas "Recommended" shows possibilities for achieving higher yield (mainly by trading silicon area).
 

erikl said:
I'd think "Guidelines" characterizes the min. rules for DFM, whereas "Recommended" shows possibilities for achieving higher yield (mainly by trading silicon area).
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And Analog rules will invoke DRC rules unique to analog circuits such as diff pairs and current mirrors. You may be required to draw a special layer over these circuits to identify them.
 

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