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Problem selecting an error marker

bala000

Hi,

I'm trying to instantiate a pcell from technology library which is provided by foundry. Few pcells are not supported by foundry at present moment. So, an error marker is being created with description "currently not supported by foundry" for such cells. Now, I'm instantiating pcell using dbCreateInst(). Is there a way I can identify that, this pcell is not supported by foundry, using skill? I'm unable to select that marker to obtain it's properties.

Thanks,
Bala

Parents
  • Hi Bala,

    If you create the instance using SKILL then you can probably also detect/find if there is a marker associated with the created instance (using SKILL you can find this, even if you cannot seem to physically select the marker in a layout). Using dbCreateInst() will create a default instance of the PCell - there is also dbCreateParamInst() and dbCreateParamInstByMasterName() so that the parameters can be supplied. A default device might be deliberately invalid to force you to supply realistic non-default values, so watch out for that (that entirely depends on how the foundry implemented the PCell, many developers may not do this). Interactively you may need to make all layers and objects valid so that you can select the marker to help develop your code. You are trying to programmatically discover if the device is supported based on trying to instantiate it; another approach might be to just maintain a (white) list of allowed devices (or a black list of disallowed devices?)

    Best regards,

    Lawrence.
Reply
  • Hi Bala,

    If you create the instance using SKILL then you can probably also detect/find if there is a marker associated with the created instance (using SKILL you can find this, even if you cannot seem to physically select the marker in a layout). Using dbCreateInst() will create a default instance of the PCell - there is also dbCreateParamInst() and dbCreateParamInstByMasterName() so that the parameters can be supplied. A default device might be deliberately invalid to force you to supply realistic non-default values, so watch out for that (that entirely depends on how the foundry implemented the PCell, many developers may not do this). Interactively you may need to make all layers and objects valid so that you can select the marker to help develop your code. You are trying to programmatically discover if the device is supported based on trying to instantiate it; another approach might be to just maintain a (white) list of allowed devices (or a black list of disallowed devices?)

    Best regards,

    Lawrence.
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