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How can I generate schematic of standard cell using standard cell library data given by foundry in Virtuoso?

ADITYA56

I have done the following steps

1. I have created layout using gds and lef file from standard cell library using virtuoso by importing lef and gds.

2.I have also created symbol using cds.lib by assigning data from standard cell library

But now I want to generate schematic for timing simulation in virtuoso . 

  • Andrew Beckett

    Assuming that you have a SPICE or CDL netlist for the standard cell library, you could use File->Import->SPICE to do this.

    Regards,

    Andrew.

  • ADITYA56
    Using CDL netlist for the standard cell library, and using  File->Import->SPICE ,
    We got error message as shown in snapshot .

    ERROR (SPICEIN-24): Spice In did not find the symbol view of the master cell 'nfet' of the instance
    'MN15' in the subcircuit 'AD42M2RA'. Specify the reference library that has the symbol
    view of the master cell, or use device-mapping to map 'nfet' to a different
    cell.

    We have also added symbol library as a reference library.

  • Andrew Beckett

    I'm assuming you have a PDK with the transistor symbols and so on? If so, you'll need to set up the device mapping (you can do this on the SPICE in form) to map the model names (or subtype names if it's a CDL netlist) to the appropriate PDK device. Because there's no mapping, it's looking for a generic "nfet" device, which is failing - so you need to provide the correct mapping.

    Regards,

    Andrew.

  • ADITYA56
    Dear Sir,Could you please elaborate the procedure to create a device map file ? Or is it that it directly comes in the foundry data? Or do we need to create it manually ? If manual then whats the procedure to do so ?
  • Andrew Beckett

    I doubt the foundry data will include a device mapping file, but it's easy to create through the Device Map tab on the SPICE in form. For more details, hit the "Help" button at the bottom of the SPICE in form.

    Regards,

    Andrew.

  • Kian Boon
    in reply to Andrew Beckett

    Example:

    devSelect := nfet nmos2v
    propMatch := subtype N
    devSelect := pfet pmos2v
    propMatch := subtype P

    You may refer more by clicking the "Help" button at the bottom of the form.

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