[SOLVED] Assura RCX exits with bad status

Hi,

I wanna extract C only for my block. I have done rc extraction for a couple of blocks. but this time, assura is quitting with a strange error
=================================
cat <<ENDCAT> sch_cap_ground
VSS
ENDCAT
sch2lay -a -r /design/sysext/dt02/users/sivaram.popuri+dt02+dt02z+4/ver/lvs/integ_blk_siva/integ_blk_siva.gnx -rd /design/sysext/dt02/users/sivaram.popuri+dt02+dt02z+4/ver/lvs/integ_blk_siva/integ_blk_siva.gdx sch_cap_ground lay_cap_ground
*WARNING* at "sch2lay": Unsuccessful translation for VSS in subckt integ_blk_siva
CAP_GROUND=`findCapGround -gfn lay_cap_ground NET`
*ERROR* at "findCapGround": file lay_cap_ground is empty. CAP_GROUND cannot be set. Exiting.

*WARNING* Bad return status from RCX run. 0x100
=====================================================================

Has anyone seen the similar error before. I'm browsing through cadence sites as well as googling... But I'm unable to trace this lay_cap_ground.

Thanks,
Siva

I opened up the lay_cap_ground file and I cud see the file is empty. I appended lay_cap_ground file with vss, added a vss pin to the layout& schematic which has resolved the issue.

psrkforuvlsi said:

I opened up the lay_cap_ground file and I cud see the file is empty. I appended lay_cap_ground file with vss, added a vss pin to the layout& schematic which has resolved the issue.

Click to expand...

hi,siva
actually I have faced the same problem that u have described here,and I have tried to solve this in that way but the problem is I could not find that lay_cap_ground file. so it would be really helpful if u can tell me where I will get that file.

thanks
amit

@AMITH,

In your RCX run window, you can find the run details tab.In the run details tab, you can find run directory and both sch_cap_ground as well as lay_cap_ground would be created by Assura. If you cant find, you can create it by yourself.

Thanks,
Siva

amit.28 said:

hi,siva
actually I have faced the same problem that u have described here,and I have tried to solve this in that way but the problem is I could not find that lay_cap_ground file. so it would be really helpful if u can tell me where I will get that file.

thanks
amit

Click to expand...

I just had the same problem. But i solved it in another way. I set the Space Name in QRC->Extraction from Schematic Names to Layout Names. Then it works.

- - - Updated - - -

I tried your solution method. It doesn't work in my case. Don't know why. I appended the VSS in lay_cap_ground, saved it and simulated the QRC again, but it failed. Then i opened the lay_cap_ground and found that it is empty again.

You need a Ref_Node, in physics we call that a reference-ground-plane, for the E-fields that gets decoupled to this node.
There are few small , however important things, once understood and taken care of - rest is very easy.

From layout perspective the substrate - is the reference node.

If you are using Net-Name-Space "Layout" - use the node name - of your omnipresent substrate layer.
How to know? - what node-name did my substrate get?
- Use LVS probing
- you can check extracted Layout-netlist - and see what is the ground netname.

If you are using Schematic as input net name space, use schematic netname.

Don't mix.