poly orientation in 28nm in TSMC

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schowdary

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Anisotropic process steps cause assymetries in process. The mismatches caused by this effect can be avoided by maintianing same orientation such that the current flow will be strictly in one direction.

And poly orientation issue might come under DFM issue too.. the stress effect will be different for different orientations. One might effect the other.

even I'm a newbee to 28nm though. just sharing my thoughts.
 

Anisotropic process steps cause assymetries in process.
s.

What do you mean by this?.

The orientation is kept straight so that the current flow will be max and in unidirection.
 

I agree. We can just flip it , but can not 90 degree oritating
 

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