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Pitch distance measure by Skill

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Hello All, I can provide to my Skill program some placed BGA RefDes ("U40" for example). How Skill program could measure this BGA balls pitch distance ? Any response appreciated Thanks, Shimon


Originally posted in cdnusers.org by shimon37

  • Hi Shimon,

    Try:

    symbol = car(axlSelectByName("REFDES" "U40")); Select the BGA
    axlClearSelSet()
    pins = symbol ->pins; Identify the BGA pins
    minPitch = nil; Declare the minimum pitch variable
    foreach(pin1, pins
    foreach(pin2, remove(pin1, pins)
    pitch = axlDistance(pin1 ->xy, pin2 ->xy); Measure the pin to pin pitch of every pin with every other pin
    minPitch = if(minPitch, min(minPitch, pitch), pitch); Compare pitch with minimum found so far.
    )
    )
    minPitch

    Cheers, Dave


    Originally posted in cdnusers.org by Dave Elder

  • Hi Dave, Thank you very much for your response. It works perfectly. Thanks again, Shimon


    Originally posted in cdnusers.org by shimon37

  • Hi Dave,

    I am a beginner in SKILL routines. I know how to include a SKILL function in allegro.ilinit and execute it from allegro. But I don't know how to use the SKILL code directly in allegro(like the one you had in this post for reporting the BGA pitch) because it is not in the form of a skill function. I had tried to switch to the skill command window and paste this code in allegro. But it is not working. I know I am missing some thing. Please correct me if I am not going the right direction.

    Please bear with me for deviating from the original subject...

    Thanks in advance,

    Babu 

  • Hi Babu,

    Pasting all those lines into the Skill window won't work. The interactive command interpreter will only accept one Skill command at a time - and it must be all on one line.

    In the example you would have to paste each of these lines one by one:
    symbol = car(axlSelectByName("REFDES" "U40"))
    minPitch = nil
    foreach(pin1, pins foreach(pin2, remove(pin1, pins)
     pitch = axlDistance(pin1 ->xy, pin2 ->xy) minPitch = if(minPitch, min(minPitch, pitch), pitch)))
    minpitch

    Note how the foreach loop must be self-contained on one line.
    I will discuss this issue with Cadence at the next week's CDNlive conference. Other Lisp implementations that I have used do not have this limitation.

    Cheers, Dave

  •  Hi Dave,

    I got it worked. Thank you for your valuable inputs.

     Babu

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