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Problems connecting a padpin to a ring

timoue

I am using sroute to connect my pad pins to the ring.  It works fine for ports that are defined with USE POWER and USE GROUND.  Unfortunately I have another pin that is optionally configured to connect to VSS or VDD.  This port is a wide port and is like a power/ground port but defined as such.  Is sroute the right command here?

  •  Hi,

    You can edit the lef file and add :
    - "USE POWER ;" below definition of pin.
    - "USE GROUND ;"  below definition of pin.

    For example :

    PIN PSEUDO_POWER
       DIRECTION INOUT ;
       USE POWER ;

    PIN PSEUDO_GROUND
       DIRECTION INOUT ;
       USE GROUND ;

    On the other hand you can do a connection by hand.

    Regards.

  • Hello,

    changing the lef file is not an option.  The same port is configurable to attach to VDD or VSS.  If it is defined with USE POWER than I get an error when I try and attach it to VSS.  If it is USE GROUND, a VDD connection yields an error.  I can the logical connection to happen with a simple attachTerm.  The problem is that I cannot get sroute to route up the port to the core ring.

    Tim

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