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Can't create devices in layout using pycells

edbewald

I am using IC6.1.5.504 in 32bit mode.  RHEL5, linux x86-64.

 We recently started looking at a kit that utilizes Pycells.  When we place an instance of

a device (ex. nch_mac) none of the layers are visible.  The 'q' form shows the correct

parameters, the layer pallette shows the correct layers.  When I try to stream out, I get the

error, 'translating cellview <path>/layout as STRUCTURE' and no GDS file is created.

Has anyone else seen this and is there a solution?

Thanks,

Eddie

Parents

  • Eddie,

    As Quek said, Cadence does not support the use of Pycells. What that means is that if there is a problem, we are unable to support or fix problems because we will not be able to reproduce the problem (unless it can be reproduced with a SKILL pcell), there is no testing, and also there are some features of the layout tools (primarily in VLS GXL) which require SKILL pcells. If you're using an "iPDK" then you should be able to get a version of the PDK from the foundry which uses SKILL pcells and thus does not have any of these problems or limitations.

    You say that "Cadence uses a tcl callback". Well, Cadence does not use tcl callbacks, but maybe the Pycell-based PDK uses Tcl somewhere - I can't comment on that.

    Regards,

    Andrew.

Reply

  • Eddie,

    As Quek said, Cadence does not support the use of Pycells. What that means is that if there is a problem, we are unable to support or fix problems because we will not be able to reproduce the problem (unless it can be reproduced with a SKILL pcell), there is no testing, and also there are some features of the layout tools (primarily in VLS GXL) which require SKILL pcells. If you're using an "iPDK" then you should be able to get a version of the PDK from the foundry which uses SKILL pcells and thus does not have any of these problems or limitations.

    You say that "Cadence uses a tcl callback". Well, Cadence does not use tcl callbacks, but maybe the Pycell-based PDK uses Tcl somewhere - I can't comment on that.

    Regards,

    Andrew.

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