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Innovus: Routing Quires & General Advice

Anas2023a95

Dear all, 

I'm working on Innovus to place and route a digital design generated by Genus. 

When I look at the auto-routed layout, there are some points at which I think the tool should be able to do a better job (if I correctly direct the tools). 

1) The Pad cells have two pins with the same name. The tool only connects one pin to the power ring. Is there a way to direct the tools to connect both pads? 

2) The strategy used to connect pad circuitry to PG nets is I think the "nearestTarget" strategy. Can I force the tool to use the nearestTarget everywhere except for PG nets, where I want all connections to be made directly to the power rings? 

sroute -connect { blockPin corePin padPin padRing floatingStripe } -layerChangeRange { M1 M5 } -blockPinTarget { nearestTarget } -padPinPortConnect { allPort oneGeom } -padPinTarget { nearestTarget } -corePinTarget { firstAfterRowEnd } -floatingStripeTarget { blockring padring stripe ringpin blockpin followpin } -allowJogging 1 -crossoverViaLayerRange { M1 M5 } -nets { VDD VSS } -allowLayerChange 1 -blockPin useLef -targetViaLayerRange { M1 M5 }

3) Should the PG and CLK signals be on a specific layer? I'm planning to have those signals on Metal5 as it should have the lowest capacitance in a 5M process, right? 

Please feel free to share your general advice to someone working on his first chip ^_^ 

Many thanks 

Anas

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  • FormerMember
    FormerMember

    An addition to Dimo's answer about (1)

    You can tell sroute to connect all shapes/ports by selecting the "All" radio button in the Advanced sroute menu. To innvoke this menu, select Route -> Special Route... -> Advanced -> Pad Pins

    Alternatively, use the padPinPortConnect argument to do the same. Here's an example that connects the pad pins to the core ring at all ports and all geometries:

    sroute -nets { VDD VSS } -connect {padPin} -padPinTarget {ring} -padPinPortConnect {allPort allGeom}

  • in reply to FormerMember

    It works! Thank you both for your great support!! ^_^

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