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Setting a custom routing grid in Virtuoso using constraints

Juerg

Hi,

I would like to place and route some fully custom-made logic cells using Virtuoso XL (menu Route->Automatic Routing). The logic cells are made for a routing grid which is not the same as the routing grid defined in the tech file (constraint group LEFDefaultRouteSpec).

In the constraints editor/process rule editor, I have tried to define my own constraints ("Horizontal/Vertical Offset/Pitch") for each routing layer, as well as "Default Horizontal/Vertical Routing Offset/Pitch", assuming that these settings would override the defaults taken from the tech file.

However, the router does not seem to take my settings into account. Also, the routing grids which are initialized within the P/R Boundary when I choose "Reinitialize Floorplan" always show the settings from the LEFDefaultRouteSpec constraint group while ignoring my custom settings.

Is there anything that I'm missing, or is there a better way to achieve what I want? I'm not the only designer working on this project, so I cannot modify the tech file.

I'm using Virtuoso Layout Suite XL ICADV12.1-64b.500.9EHF-1270.


Thanks & best regards,

Juerg

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