cmos10lpe - how can i correct ERC errors ?

[maioi]

cmos10lpe process

Hello,

I'm using cmos10lpe (IBM kit), and i tried the layout of a single nfet, i put pins on each terminal, and subc on the substrate terminal, i have a clean lvs BUT with two ERC errors saying:
-Floating_sub: Substrate regions must connect to last metal in Cell or Chip
-Floating_sub2: Substrate regions must connect to GROUND net

I don't understand these errors, it seems it doesn't see the substrate tap in the layout ( i already put a tap)

can anyone help me please? how can i correct these ERC errors?

Thanks in advance.

 

[erikl]

cmos10lpe

Did you connect the substrate tap by metal1 ?
Is this net named GROUND ?

 

[maioi]

Re: cmos10lpe

I just put the substrate tap, named sub and it is not connected to ground,
but anyways i tried to connect it to ground in schematic and layout i found the same ERC error

 

[erikl]

Re: cmos10lpe

... i tried to connect ??? it to ground
in schematic and layout i found the same ERC error

Sub-tap contact by metal1 ? Name of this net? Also, check your ERC rules' setUp!

I suspect without an image of your schematic & layout we can't help you.

 

[vkshenoy]

cmos10lpe

what is last metal? Metal1 or top most?

 

[erikl]

cmos10lpe

Last in the process: the top most.