What are the impacts of IR drop in Physical design?

[edagops]

Hi,
Could you please explain in detail about,
Possible impacts of IR drop(over macro region and in core area) in Physical design perspective...

Thanks,
edagops

 

[hiral.kotak]

Re: Impact of IR Drop

HI,

Normally, the power and timing analyzer assumes a single voltage across the entire power/ground
rail network, that is set by the operating conditions. This voltage, however, does not reflect the drop
caused by cell currents. An IR drop on the power and ground rails affects cell delays—the higher the
IR drop, the slower signal changes propagate through cells. The delay changes and the reduced
supply voltage of the cells, in turn, affect power consumption in the design. Typically, power
consumption is lower when IR-drop effects are considered.

It may help you.

Thanks..

HAK..