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Finding all the Cells in a Design

Vaishnavi
I've started using SOC Encounter recently and I'm still not clear about a good many things. But here's my first question. I need to identify all the flip-flops in the design and detach a certain pin from the net connected to it. I'm having a hard time figuring out how to traverse through the design so I don't leave out any flip-flops. I want to start from the topcell. Any suggestions? Thanks Vaishnavi
  • I used the following command to get a collection of all the flip flops in the design all_registers -flops I then used get_object_name to find the name of the instance. How do I use this information to find the pins associated with this instance? If I can find the pins, I can use report_net -pin to get the net connected to the pin and then use detachTerm to disconnect the net from the pin.

  • Great question.  You *could* accomplish this with CTE-TCL commands like all_registers, but I'd suggest dbGet as an easier approach.

    If you wanted to detach the net from all the SE pins from the sequentials, you could do it as follows:

    foreach inst [dbGet -p2 top.insts.cell.isSequential 1] {
      set instName [dbGet $inst.name]
      detachTerm $instName SE
    }

    For more information on dbGet, have a look at these helpful posts from Kari Summers:

    Hope this helps!
    -Bob

     

     

  • Thanks Bob! Your hint pretty much did the trick for me.

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