UPF for standard IO cells

[NeilDegruth]

Hi, I use Design Compiler and IC Compiler II for top-level designs. Do I need to write UPF for standard IO cells since they have two voltage domains (VDD and VDDPST)?

 

[ThisIsNotSam]

VDDPST drives the cells inside the IOs. It will not be going to the core, so you can ignore it during UPF encoding. You don't have to, but you can.