I have a set of pads for use in a design and I was wondering which attributes should I put on each pin.
Let's say it has the following pins:
- inh_vdd, inh_vss, CORE, PAD where the first two are for the pad rings, the CORE pin is to use in the die and the PAD pin is the bonding pad.
I guess CORE would need:
CLASS CORE
USE POWER (or GROUND if this happened to be a ground pad)
What about the inh_vdd and inh_vss? Theyu would not have the CLASS CORE, but would I use USE POWER/GROUND on them too?
USE POWER (or GROUND)
SHAPE ABUTMENT
And the bonding pad? Should I put it in the LEF? Or would that cause confusion to innovus or Voltus? And what attributed would it use? USE POWER/GROUND only?
Do I need anything in the LEF to indicate that the pin CORE and the pin PAD are essentially the same thing, just different places on the same power pad?