Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Why it is better to insert filler cells after routing?

Status
Not open for further replies.
jitendravlsi

jitendravlsi

Full Member level 2
Full Member level 2
Joined
Jul 21, 2008
Messages
132
Helped
8
Reputation
16
Reaction score
5
Trophy points
1,298
Activity points
2,136
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

    Points: 2
    Helpful Answer Positive Rating
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

    Points: 2
    Helpful Answer Positive Rating
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

    Points: 2
    Helpful Answer Positive Rating
Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top