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Virtuoso Chip Assembly Router

b53649

I want to perform automated routing using VCAR such that my metal layers of supply lines (VDD & GND) can be defined by user itself and is routed in that layer only.

Right now even if i define layer of vdd and gnd net in say M4 even then routing is performed in layer suited to VCAR. How can i do this?

 

If possible please suggest any command so that i can add in my do file for different layouts.
 

 

  • Hi Ujjwal,

    You didn't mention what release of virtuoso you are using.

    If you are using 6.1.6 you can define constraints for the nets (either a class or process-rule override) using VLS-XL and specify valid layers.

    Alternatively, you can do this in VCAR by defining costs for the routing layer.

    This can be done at the design level, layer level or, what I think you need, at the net level.

    Click rules->net->wiring

    You can click on the "use layers" button.

    That's one way.

    Colin

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