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Using the Virtuoso autorouter: routing grid

RVERP

How do I set the routing grid? I can use the option to route on the routing grid, but I can't find how to check it's value, or how to set a new value.

I want to force the autoroute to place spines/vias on the exact grid I want, so I suppose the routing grid is what I have to use.

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  • ColinSutlieff

    Hi,

    By default, the router is in "hybrid" mode which means that it can go off-grid if there are pins that are placed off-grid.

    But, could you check if you have any routing offsets in your techfile or technology graph (Constraint Manager->Process-rule overrides)?

    Is it possible that the router is putting the routing on grid but ignoring the offsets?

    If so, we may need to investigate this further.

    Colin

Reply
  • ColinSutlieff

    Hi,

    By default, the router is in "hybrid" mode which means that it can go off-grid if there are pins that are placed off-grid.

    But, could you check if you have any routing offsets in your techfile or technology graph (Constraint Manager->Process-rule overrides)?

    Is it possible that the router is putting the routing on grid but ignoring the offsets?

    If so, we may need to investigate this further.

    Colin

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