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Chop only section of the MPP lines

vadagar

Hi.

I created a shield line structure where I need to chop the only section of the bottom shield. In the following image, the bottom shield (in red) and signal  (in green) are shown. The blue rectangle drawn is where the red bottom shield needs to be removed. The all bottom shield is set to choppable. The white text layer is the master.  

When I tried to chop, I will get the following messages:

*WARNING* RODChopMPP: ROD Multipart Path: invalid chop occurred, chop ignored because master path is not choppable
*WARNING* RODChopMPP: Hint: you must chop entirely through the master path at right angles for a good chop
*WARNING* RODChopMPP: Use rodUnNameShape if you want to remove the multi-part path relationships

Is there a way to implement it? or am I doing something wrong?

  • I'm not sure this is possible with an MPP, but I can't really check without seeing the code that produces the MPP in the first place.

    Another approach would be to create a fluid pcell, but that's going to be much more complicated (at least without using Cadence PCell Designer to create it).

    Regards,

    Andrew

  • in reply to Andrew Beckett

    I used rodCreatePath(). offsetSubPath and SubRect are generated by another program as a lists. The code works fine. Only thing chopping a particular layer at particular locations.

    rodCreatePath(
       ?name 'metal_shield ;'
       ?layer list("TEXT" "drawing")
       ?width  masterWidth
       ;?pts sheild_path
                     ?pts list(0:0 10:0)
       ?justification "center"
       ?offset 0.0
       ?endType "truncate"
       ?beginExt 0.0
       ?endExt 0.0
       ?choppable nil
       ?cvId cv
       ?offsetSubPath signal_list
       ?subRect sub_rect_list
      );rodCreatePath

    Regards,

    Vadagar

  • in reply to vadagar

    Vadagar,

    The devil is in the details. It's the offsetSubPath and subRect that I need to see... Perhaps you can show what's in signal_list and sub_rect_list?

    Andrew.

  • in reply to Andrew Beckett

    I am not able to post the code... Error is occurring. 

  • in reply to Andrew Beckett
    Hi Here is shield line creation code. Somehow whole code can not posted here.
    input_list = list("METAL1"  "METAL2")
    ;//shield line creation
     for( i 1 3
     
      signal_list = append1(signal_list
        list(
        ?layer   list(nth(i-1 input_list)   "drawing")
                                    ?width   sh_width
                                    ?choppable     nil
                                    ?sep     sep_start
                                    ?justification   "left"
                                    ?beginOffset     -0.050000
                                    ?endOffset       -0.050000
                            ) )  
     );for
     
  • in reply to vadagar

    OK, that code isn't enough for me to reproduce anything. There are lots of variables that aren't defined - the loop has three points in it, but the input_list only has two layers - and the result looks nothing like the layout you produced.

    It would be sufficient to just know what signal_list and sub_rect_list look like - i.e. what the variables contain - rather than seeing the code that produced them (knowing masterWidth would be useful too).

    Also, which IC subversion are you using - getVersion(t) will tell you that?

    Andrew.

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