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How to handle multiple physical IO pins for a single port?

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When I P&R a huge block, there are situations that I need to place several physical IO pins for a single top level port/net, usually, on different sides of the block for the purpose of easing the higher level connection.   FE looks like only understand one physical IO pin for each port/net and when I did trial route, I found only one physical pin per net(port) was hooked up.  In this way, it coundn't estimate the real routing congestion through the whole block when I have hundreds of such kind cases of multiple IO pins (for each net/port).

How can I let FE know that there are several physical IO pins for a signle port and therefore, it will connect all of them together when it route the block for me?


Originally posted in cdnusers.org by tzhou@micron.com
Parents

  • Is that what you have in the def file? I assumed nanoroute is doing the right connection since you did not mention about nanoroute. If that is true, it must be a bug in the trialRoute.

    PINS 2 ;

    - a + NET a .... ;

    - a.extra1 + NET a ... ;

    li siang



    Originally posted in cdnusers.org by lisiang
Reply

  • Is that what you have in the def file? I assumed nanoroute is doing the right connection since you did not mention about nanoroute. If that is true, it must be a bug in the trialRoute.

    PINS 2 ;

    - a + NET a .... ;

    - a.extra1 + NET a ... ;

    li siang



    Originally posted in cdnusers.org by lisiang
Children
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