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Why it is better to insert filler cells after routing?

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jitendravlsi

jitendravlsi

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Filler cells can be inserted before or after routing.

But why it is better to insert filler cells after routing?


thanx
 

Re: filler cells

Hi,

>>But why it is better to insert filler cells after routing?

Still P & R tool might be optimizing the design to meet the timing by moving the cell here and there, that is why filler cells will inserted after routing.

Regards,
 

    jitendravlsi

    jitendravlsi

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Re: filler cells

Still P & R tool might be optimizing the design to meet the timing by moving the cell here and there, that is why filler cells will inserted after routing.
Click to expand...

But PnR tool can do the same optimization after inserting the filler cells. In that case it will replace the filler cell with std cell or we can say the std cell will swap with filler cell.

I dont know whether it is possible or not for the tool to swap cells.

Is there any other reason?

by the way thanks for reply............
 

Re: filler cells

Hi,

>>But PnR tool can do the same optimization after inserting the filler cells.
If you insert filler cells before routing, cell placement is fixed and tool cannot move the cells for better placement optimization.

Regards,
 

    jitendravlsi

    jitendravlsi

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Re: filler cells

Hi,

For that reason above, it is suggested that filler cells should be inserted after every optimization is done.

As it is, filler cells insertion should be done at the end of PNR.

Thanks.
 

    jitendravlsi

    jitendravlsi

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