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forcing separate clines

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Allegro keeps all the segments (line/arc objects) that make up a cline (path object) in nice neat tail->head order in a list.

If you lay down a trace from a pin halfway to another pin then end your Connect command that leaves a stub cline with a ratsnest line to the destination pin. If you start a new Connect command, click on the end of the stub and complete the trace and end your command you get ONE cline from pin to pin - Allegro helps you by merging the two separate clines into one.

99% of the time this is what you'd want. But of course I need that 1% :

how can one prevent this behavior? To wit: how can one force Allegro to keep clines distinct?

pinA--------------------X-----------------------pinB

instead of merging to get

pinA--------------------------------------------pinB


TIA,

Chris Walters
local Cadence guru
()


Originally posted in cdnusers.org by kerchunk
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  • There's a really simple way to do this.

    Let's say your line is 8.5 mils wide.  Assume database accuracy is set to 3...

    Next select edit->change (find filter = clines); Set line width to 8.501

    RMB->Cut

    Click where you want. move over 1 mi. Click

    Now you have a segment with a different line width (in Allegro's database) but it won't actually  change anything in the fabrication world.  The tolerance on fabrication is in the neighborhood of 0.5 mils.

     

    Just another way to address the problem.

    HTH 

Reply

  • There's a really simple way to do this.

    Let's say your line is 8.5 mils wide.  Assume database accuracy is set to 3...

    Next select edit->change (find filter = clines); Set line width to 8.501

    RMB->Cut

    Click where you want. move over 1 mi. Click

    Now you have a segment with a different line width (in Allegro's database) but it won't actually  change anything in the fabrication world.  The tolerance on fabrication is in the neighborhood of 0.5 mils.

     

    Just another way to address the problem.

    HTH 

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