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create a pcell ( symbol, not layout), and create its cdf.

youcanred

Hi, 

I want to create a symbol(not layout) by using pcell so that i can add cdf and easily change the pin number when use it. Just like analogLib, nport. i have already known how to dump the cdf code of "analogLib" so i can make a reference. however i have no ideal about writing a "symbol" pcell.

I noticed that cell in analogLib has "spectre" "symbol" "symbol_xform", there is a function  dbCreateXformPCell  ，i write a code as follows:

dbCreateXformPCell( "ind" "pcell_lib" )

But it has error:

argument #1 should be a database object (type template = "dt") - "ind"

Is there any command that I have to add to it?

and it will be very gratefull if you could give me a useful code to let me make a reference, or tell me how to dump the pcell code just like the cdf.

regards,

Jocelyn

  • Hi Jocelyn,

    That's not really going to help you. The dbCreateXformPCell is specifically for creating a variant of the existing fixed symbol which supports magnification and any-angle rotation. The primary motivation for this was to act as a substitute for the mag parameter that used to exist in CDB but doesn't exist in OA. It would not help with creating parameterised symbol with a variable number of pins.

    It failed because the first argument needs to be a cellView id (i.e the return value of dbOpenCellViewByType having opened the source cellView) and not the name of the cell. However since it's not the right approach, this is not going to help you terribly.

    You might find my article: How to create pcell symbol with variable pins and write custom netlist procedure for spectre useful though.

    Regards,

    Andrew.

  • in reply to Andrew Beckett

    Hi Andrew,

    Thank you so much for your help. I think your article is just what I'm looking for. However I'm a student and I don't have the Host ID and Ref Key. Could you send the article to my email? I'll appreciate it. My email is: youcanred@hotmail.com 

    regards,

    Jocelyn

  • in reply to youcanred

    Hi Jocelyn,

    Please work through the professor responsible for the Cadence tools at your university - they should be able have access to support.cadence.com . Alternatively (if part of the Europractice scheme), contact them and they should be able to help.

    I'd sooner make sure you have the access process set up for future reference...

    Kind Regards,

    Andrew.

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