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Connectivity->Update->Layout Parameters problem

Hi,

I am using virtuoso XL in cadence ic615.06.15.151. I noticed that Connectivity->Update->Layout Parameters do NOT update multiplier

parameter m of device in schematic. As a result, if schematic has been changed, and you tried to update layout parameters corrresponding to schematic, you are going to miss this kind of change, and you're going to find out when you run LVS. That's a big hassle. Is it a way to get around this ??

Thanks,

skillUser over 12 years ago

Hi HP,
Have you checked that the parameters are set up correctly on the Layout XL Options form (Options -> Layout XL), look at the "Schematic Parameter Names" section under the "Parallel-connected factor" that the names match those used in the schematic, and that the 'm' factor names are not set up to be ignored during generation and update (in the "Ignore" section at the top of the form).
If this does not help you may need to supply more detail.
Best regards,
Lawrence.
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pham777 over 12 years ago

Hi Lawrence,
Thanks for your input. I did check layout xl options form as you said. I want to upload a picture of the form here, but I don't know how.
One more detail, if I delete old layout of that particular instance and regenerate it from schematic then it comes out OK, but if I used connectivity->update->Layout Parameters then it will update all parameters except m(multiplier)
regards,
ha
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Andrew Beckett over 12 years ago

Use the Options tab when replying to a post to attach a picture.
Andrew.
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pham777 over 12 years ago

Sorry, I'm out of office for a week. Here is my layoutXL parameter option form.
- xl_options.png
- View
- Hide
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berndfi over 12 years ago

Just a guess, probably try "Update -> Compopnents and Nets", because the m factor usually creates an extra device.
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Andrew Beckett over 12 years ago

Bernd,
You beat me to it - indeed, you need to do Update Components and Nets.
Regards,
Andrew.
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pham777 over 12 years ago

Yes, it works when I do Update Components and Nets. But that's mean I can NOT use Connectivity->Update->Layout Parameters ??
then what is the use of this method ??
regards,
HP
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berndfi over 12 years ago

I tried this now in my environment and it works as it’s supposed to do.
Even if I have not worked intensively with layout XL over the last couple of
years I wouldn’t expect the tool to behave different.
Why the m (multiplicity) factor is treated differently form other parameters like width, length or number
of fingers, which are all updated with the "update layout parameters", is because m defines a m times physically
separated devices in parallel. In this case it is an extra component and some extra nets, parallel wiring for S, D, G for e.g.
a MOS device. So you need in fact "update components and nets".
This should it make more clear.
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pham777 over 12 years ago

Thanks Berndfi.
HP
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