About unbound devices in Assura LVS with IBM cms9flp

[shahriar22nd]

Hellow,
I am checking LVS of a single nfet with Assura in IBM cms9flp. It is an rf type of nfet, which has inherent substrate contact, so I used none explicitly, as can be seen in the attached figure. My problem is, the lvs ends with:

Preprocessing schematic network phase 2
Preprocessing layout network phase 2
*ERROR* Device 'nfet_rf(MOS)' on Schematic is unbound to any Layout device.
*ERROR* Device 'nfet_rf(Generic)' on Layout is unbound to any Schematic device.
*ERROR* UnBound devices found.
Info: All devices must be bound or filtered for comparision to be run.
Exiting nvn.

Would anyone please suggest me what can be done to overcome this probelem?
Thank You

 

[sat]

Perhaps in the extract.rul file for this technology, that have extractDevice( ) instead of extractMOS() which leads to this specific MOS device get netlisted as a GENERIC device. However, auLVS simInfo in the CDF has this as MOS device, hence schematic side is netlisted as MOS type.

Many remedies:
- use mosDevice in compare.rul - before NVN comparison
or
- use a binding file that has something like

C nfet_rf(MOS) nfet_rf(Generic)

///////
If you want to proceed beyond this error and want LVS to complete anyhow - set :
abortOnUnboundDevices( nil ) --> this is a generic avCompareRules().

In case, the non-english words, commands or keywords above does not make sense, check them inside assura command reference manual.

Hope this helps.

 

[shahriar22nd]

Thank you, Sat. I followed the second one- added C nfet_rf(MOS) nfet_rf(Generic) in the binding file and passed the lvs. But, I am thinking why the users have to modify these files! Are we tampering the files and avoiding the actual simulation?

 

[Kicchan]

I've got the same problem with UMC130nm (both NMOS and PMOS were said to be unbounded). I've written the binding file like this:
C N_12_HSL130E N_12_HSL130E
C P_12_HSL130E P_12_HSL130E

Now I don't get the problem for the NMOS anymore but it still returns error for the PMOS. It says there is no layout cell named P_12_HSL130E. Why did it work out only for the n-type??
Please, help me...

 

[Kicchan]

I've found out that it worked out for the nmos only because I implemented the pmos with 2 fingers. If I use just 1 finger for the pmos as well, I have no unbound devices anymore. Btw, of course I do want to be able to implement multifinger devices. Do I need a further binding command for them? Should I set up a special configuration in avParameters/avCompareRules?