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Cadence layout suite XL - some overlap regions get highlighted in yellow

jdp721

Hi.


While drawing various layers in Cadence layout suite XL, occasionally, some regions where 2 or more layers overlap get automatically highlighted in yellow! (please see attached scrrenshot)

The significance of this highlighting is not quite comprehensible (also these aren't related to DRC errors).

Is there any way to disable this feature?

Thanks.


Parents
  • jdp721

    Hi Marc,

    I understand that it's hard to debug without having full information.

    I am providing two screenshots of the Annotation Browser messages, with zoomed version of corresponding layout region (showing the highlighted region).

    This is layout of an analog circuit, having common centroid fingers; I think that Virtuoso is somehow not able to correlate which finger corresponds to which MOS, with respect to the schematic.

    This is evident from Property editor assistant - it is showing different net names for overlapping same layers (meant to be the same net) - hence the apparent "short":

    Property Editor Assistant

    (FYI, I am using Calibre for LVS.)

    Can these warnings of shorts highlighted by Virtuoso be neglected here?

    Annotaion Browser
    Annotaion Browser
    Annotaion Browser
Reply
  • jdp721

    Hi Marc,

    I understand that it's hard to debug without having full information.

    I am providing two screenshots of the Annotation Browser messages, with zoomed version of corresponding layout region (showing the highlighted region).

    This is layout of an analog circuit, having common centroid fingers; I think that Virtuoso is somehow not able to correlate which finger corresponds to which MOS, with respect to the schematic.

    This is evident from Property editor assistant - it is showing different net names for overlapping same layers (meant to be the same net) - hence the apparent "short":

    Property Editor Assistant

    (FYI, I am using Calibre for LVS.)

    Can these warnings of shorts highlighted by Virtuoso be neglected here?

    Annotaion Browser
    Annotaion Browser
    Annotaion Browser
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