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Cool Way to Add Vias!

Comments(2)Filed under: Digital Implementation, SoC-Encounter, via, Add Via

I knew this functionality existed, but I hadn't really put it to use until yesterday. It saved me a lot of time, so I just had to share. Here's the situation I found myself in:

LVS showed that I was missing vias to a small handful of my power-switch cells. Due to the structure of the cell, we had to make a modified copy of the LEF to get the exact via structures we wanted when we initially put in the power grid. I wasn't looking forward to swapping in a modified LEF, adding these few missing vias, and then swapping back. I wanted a quick way to just add the same kind of via as all the other connections had. Enter the "Add Via" widget:


When you click on this, you get a cursor that looks like a single via. The important next step is to press the F3 key to bring up the options form. It looks like this:


If you wanted to create a new via here, say a 4 x 6 array, you would use the Geometry option, which is the default the form comes up with. But, I already had a via that I wanted to use, and I knew the name of it. So I selected the ViaCell option and entered the name:


Then all I had to do was click in my design where I wanted the via to go. It snapped to the cell pin beautifully. So easy!


By eminem198123 on January 15, 2009
Great post, thanks, kari!

By NAADHAN on June 15, 2011
Very useful one Thanks a lot  !

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