regarding decap cell placement

[sathyanarayana raoh]

hello,

1.consider both congestion & large irdrop has occured...for reducing that i have to place decap cells...here already i have congestion...

so what may be the solution for this



ps: AMD interview question.... plz give right answers

 

[yadavvlsi]

Decap cells have only power and ground rails. It doesn't require routing. Even if design is congested, you will find a lot of empty space in design. You can put decap cells where you find empty space in design.

 

[sathyanarayana raoh]

thank u sir....

 

[chakra]

Decap cells have only power and ground rails. It doesn't require routing. Even if design is congested, you will find a lot of empty space in design. You can put decap cells where you find empty space in design.

Did you mention normal fillers ? dcap cells have devices and sometimes metal pins are elongated inside, this require re-route and worse congested area what say?

 

[rca]

Take care, if you have a lot power design, some dap cell could have huge leakage consumption.