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How to drive tie hi/lo pins? Why we need tie hi/lo cell?

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zhwa0013

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How to drive tie hi/lo pins? Why we need tie hi/lo cell? What's the difference between a clock tree and the tie hi/lo tree?
 

mail4idle2

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There is no comparision between ti hi/lo and clock tree.
Clock tree is expansion of clock.

Driving ti hi/lo cells : It does not need any inputs. it gives output high and low depending on tie high and tie low cell respectively.
 

rca

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The fanout of tie cells are usually controllable.
Some ERC rules would not have direct vdd or vss connected to std cell inputs.
 

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