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nxing
Joined: 10 May 2004
Posts: 446
Helped: 13
Location: China
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 09 Jul 2004 8:23 post-layout simulation |
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Hello everybody,
I am simulating my circuit with "extracted", however, I need to setup some initial conditions in order to make the system converge. Can anybody tell me how to do that? I know how to set them up in schematic.
Thanks in advance!
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Hughes
Joined: 10 Jun 2003
Posts: 715
Helped: 85
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| 09 Jul 2004 8:44 post-layout simulation |
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| Just like what you do in schematic simulation if you are using Analog Artist to simulate a diva extracted view. If you are simulating the extracted in command-line mode, use ".IC" statement in the netlist file.
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nxing
Joined: 10 May 2004
Posts: 446
Helped: 13
Location: China
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| 09 Jul 2004 8:55 post-layout simulation |
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Hi hughes,
Thanks for your reply. The problem is that it seems that I can not select the net in extracted cellview like I did in schematic.
Any suggestion?
Regards
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Hughes
Joined: 10 Jun 2003
Posts: 715
Helped: 85
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| 09 Jul 2004 10:29 post-layout simulation |
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Maybe you didn't save the interconnect information to the extracted view. Make sure there is a saveInconnect statement in your extract rule file. If it exists, then check your technology file and make sure there are net purposes defined for the interconnect layers.
Good luck.
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nxing
Joined: 10 May 2004
Posts: 446
Helped: 13
Location: China
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| 09 Jul 2004 11:18 post-layout simulation |
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Hi Hughes,
Thanks for your reply. There is a saveInterconnect statement in the extract rule file. However, I didn't find there is a netPurpose defined in the technology file. Under this situation, do you know how to deal with it?
Thanks
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Hughes
Joined: 10 Jun 2003
Posts: 715
Helped: 85
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| 09 Jul 2004 16:11 Re: post-layout simulation |
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1. Find which layer/purpose pairs (LPP) you need to add.
If your saveInterconnect looks like:
saveInterconnect(nsd psd cont m1 v1 m2)
then you should define LPP's: nsd net, psd net, cont net, m1 net, v1 net, and m2 net.
If your saveInterconnect looks like:
saveInterconnect((nsd "NP") (psd "PP") (cont "CONT") (m1 "M1") (v1 "V1") (m2 "M2"))
then you should define LPP's: NP net, PP net, CONT net, M1 net, V1 net, and M2 net.
2. In CIW, choose menu "Technology File / Layers ...", add the above-mentioned layer/purpose pairs. If the layer name already exists, only new purposes should be added for those layers. Otherwise, new layers should be added. The only difference is you should assign a new layer number in the latter case.
You may also add those LPP's in a .tf file.
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dumbfrog
Joined: 17 Jul 2004
Posts: 191
Helped: 4
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| 19 Jul 2004 6:52 Re: post-layout simulation |
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Try to ramp up your power or play around your .option parameters
Here is a good paper on convergence problem
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