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How to obtain Congestion Statistics after Routing is complete?

Narasimhan
Hi, I am using SOC Encounter for the first time. I have done the placement and routing of a circuit using Encounter(with the help of a few tutorials). I want the congestion statistics of the design after the detailed routing is complete. On reading the User Guide, I understand that dumpCongestArea command gives the congestion statistics after the trial route or global route. I used the command after trial route to get the congestion statistics. It showed me negative values of remaining tracks. Then, I did detailed routing and used the dumpCongestArea command. The two files have the same data. But, if i try exporting the gds layout and do a post layout simulation on the circuit, it produces the correct output. Hence, I concluded that the circuit has been routed properly. So, there cannot be negative values of remaining tracks after detailed routing. Can someone explain me the procedure to get the congestion data of the design after detailed routing? Thank you. Lakshminarasimhan
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  • Hello Narasimhan,

     I do not clearly understand what do you mean by "statastics".When you run global detail route you have the information on tracks and Gcell usage.Here is the example snippet.

     Resource Analysis:
    #
    #               Routing  #Avail      #Track     #Total     %Gcell
    #  Layer      Direction   Track     Blocked      Gcell    Blocked
    #  --------------------------------------------------------------
    #  Metal 1        H        7607        9692     1336335    62.57%
    #  Metal 2        H        7507        9792     1336335    55.84%
    #  Metal 3        V        7636        9663     1336335    59.51%
    #  Metal 4        H        8609        8691     1336335    52.02%
    #  Metal 5        V        5747       11551     1336335    56.39%
    #  Metal 6        H        5400       11899     1336335    55.09%
    #  Metal 7        V        1831        2486     1336335    55.30%
    #  Metal 8        H        2415        1903     1336335    43.85%
    #  --------------------------------------------------------------
    #  Total                  46753      56.99%    10690680    55.07%
    #
    #  589 nets (0.47%) with 1 preferred extra spacing.

    Do elaborate if you are looking for something else, would try to help.

    Hope this helps.

     Thanks,

    Vishnu

Reply

  • Hello Narasimhan,

     I do not clearly understand what do you mean by "statastics".When you run global detail route you have the information on tracks and Gcell usage.Here is the example snippet.

     Resource Analysis:
    #
    #               Routing  #Avail      #Track     #Total     %Gcell
    #  Layer      Direction   Track     Blocked      Gcell    Blocked
    #  --------------------------------------------------------------
    #  Metal 1        H        7607        9692     1336335    62.57%
    #  Metal 2        H        7507        9792     1336335    55.84%
    #  Metal 3        V        7636        9663     1336335    59.51%
    #  Metal 4        H        8609        8691     1336335    52.02%
    #  Metal 5        V        5747       11551     1336335    56.39%
    #  Metal 6        H        5400       11899     1336335    55.09%
    #  Metal 7        V        1831        2486     1336335    55.30%
    #  Metal 8        H        2415        1903     1336335    43.85%
    #  --------------------------------------------------------------
    #  Total                  46753      56.99%    10690680    55.07%
    #
    #  589 nets (0.47%) with 1 preferred extra spacing.

    Do elaborate if you are looking for something else, would try to help.

    Hope this helps.

     Thanks,

    Vishnu

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