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Cannot select a layer. Layer-Purpose pair does not exist in LSW?

vinamarora8

Here is my problem. I've added an instance of a low-leakage nmos in the layout editor using 'Add Instance' menu. Now, that instance makes use of a layer called 'CPH'. However, the layer is written in red text in the LSW. And whenever I click on it, the following error message appears:

*WARNING* (LE-104017): The entry layer cannot be set to (CPH drawing) because this layer-purpose pair does not exist in the LSW (or the Layers assistant). Ensure that the layer-purpose pair has not been set to be excluded from the LSW.

Same happens when I click on that layer in the layout editor. So, once the instance has been added, I cannot move around this particular layer. Can somebody help me tackle this situation? Why could this be happening?

  • Hi,

    I found an old report about this and it was fixed a while ago. What release are you working with (CIW-Help-About)?   You should move post 6.1.6. ISR 6 if possible, to get rid of this.

    Marc

  • in reply to Marc Heise

    Thanks for the reply! My version number is 1C6.1.6-64b.500.14. Atleast this is what I get from CIW-Help-About. Does this mean 6.1.6 ISR 14? Pardon me for not knowing this, I'm quite new to the world of cadence.

  • in reply to vinamarora8

    Yes, that means ISR 14 ( we deliver monthly/bi-monthly updates, so that's number 14 after the initial 6.1.6 delivery )

    In this case I have to look further for a solution. From your description it sounds like that layer is inside the instance. Why do you need to manipulate that?
    Often you have layers in PDKs which are not there to be used as entry layers but as markers/recognition for other tools. Quiet possible that this
    is such a layer and it's disabled for the user since you should not draw with it.

  • It is possible that the layer itself has been disabled. Check the .tf file and look up the valid column for that layer. If it says "nill" under that colu,mn, it means that layer has been disabled for usage.

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