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Add new metal layer

Michael85

Hi,

I would like to add M7 layer above the M6 layer automatically in the entire design.

in order to do that I need to create VIA M7-M6 between the to layers.

Is there a way to do that?

To cover M6 with M7 and create vias between them.

 Thanks,

Michael

  •  Hi Michael,

    To copy M6 to M7 you may have a look at dbLayerOr() function.

    dbLayerOr(
    d_cellViewId
    t_layerName
    l_dbIdList1
    [ l_dbIdList2 ]
    [ x_numVertices ]
    )

     

    I guess that you should descend down into the hierarchy on each cell do

    ;; open the lib/cell/view in "cv" variable

    m6_lpp = car(exists(lpp cv->lpps (lpp->layerName == "M6" && lpp->purpose == "drawing")))

    m7_list = dbLayerOr(cv "M7" m6_lp->shapes)

     ;;Now you will have the M7 shapes in m7_list.

     Eventually to improve the speed if  a lib/cell/view is used multiple times in the layout, and  you have already added M7 you have to skip the procedure next time (M7 is already there).

     Regarding via placing, I think that here you will need a more complex procedure.

     

    Anyway the question is: is a good idea to put M7 everywere over M6 ?

    If you already have some M7 shapes in the layout you may create unwanted shorts.

     Hope this helps,

    Marcel

  • Thanks marcelpreda.

    It works fine.

    Michaael

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