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How to get the net-figure which is connected to a specific instance terminal

MLindig

Hi,

I want to hilight only a part of a net (mainly the part from instance terminal to next branch of net). Here is an example:

I want to hilight the net part from transistor "M0" drain terminal which is connected on net "knt". I picket up the right terminal from

term = dbFindSigByName(cvId "knt")~>memInstTerms

term->net->figs contaions now all figures of the connected net. Which is the right figure (connected to term) which I could pass to geAddHilightFig(hlSetId fig) function?

 Thanks Michael

Parents

  • Michael,

    The database doesn't contain this information. Even if it did contain it for inst terms, how would it do it for each piece segment where there are joins? You'd have to have some kind of complex tree - and for connectivity you don't need that information - it wouldn't be needed for a netlister, for example.

    Assuming this is a schematic (you didn't say), you'd need to find the figures on the net, and then identify which of them overlap with the instance's pins (probably just seeing whether the coordinates of the wire segments are within the pin shape bBox, and then looking for segments with only one overlap - until you end up at a point with several coincident start/end points). Not too difficult to do.

    Regards,

    Andrew.

Reply

  • Michael,

    The database doesn't contain this information. Even if it did contain it for inst terms, how would it do it for each piece segment where there are joins? You'd have to have some kind of complex tree - and for connectivity you don't need that information - it wouldn't be needed for a netlister, for example.

    Assuming this is a schematic (you didn't say), you'd need to find the figures on the net, and then identify which of them overlap with the instance's pins (probably just seeing whether the coordinates of the wire segments are within the pin shape bBox, and then looking for segments with only one overlap - until you end up at a point with several coincident start/end points). Not too difficult to do.

    Regards,

    Andrew.

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