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Automatic via placement for power grid

Wonyoung

Hello, 

In Cadence Virtuoso, is there a way to draw a metal for power/gnd and have vias automatically placed to connect the metal to the power grids of sub-blocks? For example, I have multiple sub-blocks that uses up to M4, and have M5 power grids passing above the sub-blocks. I was wondering if I can just label the power/gnd nodes in the sub-blocks and somehow automatically generate vias between M4-M5 to connect the sub-block power/gnd to M5 power grids. I am currently using Cadence 6.1.5. 

 Thank you very much.

 Wonyoung 

Parents

  • Hi Quek,

    I think I might have found the solution. Just to check if this is the way to do it,

    1) I created two shapes, one each with metal1 and metal2

    2) opened Edit Path Properties -> Connectivity

    3) wrote VDD in "Net Name"

    After I did this, I could use the dragging the middle-mouse button to create vias. Do you think if this is the right way to do it? One problem I found with this approach is that it only works for flat designs. For example, if there are multiple cellviews instantiated in my layout and if I want to connect the VDD/GND of all these cellviews, I don't know how I can specify the "Net Name" of all the VDD/GND wires in different cellviews. 

    Thank you very much.

    Wonyoung 

Reply

  • Hi Quek,

    I think I might have found the solution. Just to check if this is the way to do it,

    1) I created two shapes, one each with metal1 and metal2

    2) opened Edit Path Properties -> Connectivity

    3) wrote VDD in "Net Name"

    After I did this, I could use the dragging the middle-mouse button to create vias. Do you think if this is the right way to do it? One problem I found with this approach is that it only works for flat designs. For example, if there are multiple cellviews instantiated in my layout and if I want to connect the VDD/GND of all these cellviews, I don't know how I can specify the "Net Name" of all the VDD/GND wires in different cellviews. 

    Thank you very much.

    Wonyoung 

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