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partition flow power planning

asicpro

I am doing a hierearchical flow using encounter. I built some partitions in my top level and then place and routed the individual blocks.  the problem i have been having is when i integrate all the blocks into my top level and flatten the design , the power routes from the blocks do not seem to merge with the top level names. i can see the vias but FE complains that they are not connected at all..  any suggestions will help a deal...!

-thanks

pjay 

  •  Hi Pjay,

    The normal flow is to add all the power before you partition, and that way the power is pushed down into your partitioned blocks. That way, you know it will match when you re-assemble the design. Did you do your power at the block level separately? Are the pwr/gnd names different?

    - Kari

  •  Make sure your globalNetConnects are in order.  Just because you have a "VDD" net at the top-level and a "VDD" pin on your hierarchical block does not mean that they will connect automatically.  You can usually see what SoCE thinks the connectivity is by making the power pins and "instance pins" visible and then clicking the "Q" button at the bottom of the GUI.  Mouse over the instance pin and check what "net:" is associated with it.  If it says "None", you are missing the globalNetConnect.

    Hope that helps,  JG

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