which one I have to use as the IO Power pads

[JineshKB]

Sir,
am using TSMC library in that I have used PVDD1DGZ and PVSS1DGZ as core power pads.
Now which pad I have to use as the IO power pads.I couldn't find any other pads with name VDD or VSS in it.

 

[chris.mourad]

Hi

Usually PVDD power pads are Power pads with VDD to GND clamp.

PVSS will be connected to VSS of your circuit and contain a power clamp from VDD to this VSS.

So you can use the 2, depending on if the voltage that you want to protect.

 

[JineshKB]

Hi

Usually PVDD power pads are Power pads with VDD to GND clamp.

PVSS will be connected to VSS of your circuit and contain a power clamp from VDD to this VSS.

So you can use the 2, depending on if the voltage that you want to protect.

Sir am new to this tool.In the .lef file 'tsmc18_6lm.lef' only 2 pads of class power
1.MACRO PVDD1DGZ
CLASS PAD POWER ; and
2. MACRO PVSS1DGZ
CLASS PAD POWER ;
these 2 I have used as core power pads now which pads I can use a IO power pads can I use the same pads?

 

[chris.mourad]

hi

Is these the only power pads you have in the library?
You could use the same power pads & power domains for core and IO.