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setting for auto via to place vias despite existing cut shapes

linbo

 It seems 6.1.x is getting more and more like Microsoft and Windows, trying to "help" us in ways that we don't neccessarily need help.  OK, here's another request...

 

When I have the via placement form "Create Via" set to "Auto"  the tool won't let me place the via cell if there are already via cells (of the same intended type) existing in the area. 

 

How do I turn this functionality "off," meaning, I want to place the vias anyway.

Parents
  • Hi Andrew,

     

    Of course that would create drc errors.  My intention is to not leave the vias there but to get the basic number in height and reduce the number in width.  e.g.

    I have a small patch of (two wide) vias in many sub cells that I need to leave alone between m5 (vertical) and m6 (horizontal).  In the particular placements of these cells I need to beef up the vertical segment for current by placing an m7 on top of the m5 and so I add the m7 and another piece of m6 vertically.  Yes, I’ll get the m5/m6 vias clobbering the sub cells but if I can just get the vertical placement I can reduce the width count so that the vias are drc correct.  The final via size that fits correctly is 257X10.  The tool would have placed 257X12. 

     

    Because the tool won’t let me just put the vias down I have to painstakingly place first, um, let’s see, maybe 100 vias by 8, no, no, bigger.  Um, 200 vias by 10.  Ok, now the width of 10 is ok but we still need more in the height.  Well how about 300.  Nope, too big.  250?  Better but not the max.  260?  Nope, ok how about 255.  Yes!  Oh but now I’d like them centered and maybe I could fit 11 in.   You get the idea?

     

    This used to work in 5.x and would have taken two steps not fifteen.  This was why I made the comment about Cadence getting more like Microsoft.

     

    Thanks,

    --lin

Reply
  • Hi Andrew,

     

    Of course that would create drc errors.  My intention is to not leave the vias there but to get the basic number in height and reduce the number in width.  e.g.

    I have a small patch of (two wide) vias in many sub cells that I need to leave alone between m5 (vertical) and m6 (horizontal).  In the particular placements of these cells I need to beef up the vertical segment for current by placing an m7 on top of the m5 and so I add the m7 and another piece of m6 vertically.  Yes, I’ll get the m5/m6 vias clobbering the sub cells but if I can just get the vertical placement I can reduce the width count so that the vias are drc correct.  The final via size that fits correctly is 257X10.  The tool would have placed 257X12. 

     

    Because the tool won’t let me just put the vias down I have to painstakingly place first, um, let’s see, maybe 100 vias by 8, no, no, bigger.  Um, 200 vias by 10.  Ok, now the width of 10 is ok but we still need more in the height.  Well how about 300.  Nope, too big.  250?  Better but not the max.  260?  Nope, ok how about 255.  Yes!  Oh but now I’d like them centered and maybe I could fit 11 in.   You get the idea?

     

    This used to work in 5.x and would have taken two steps not fifteen.  This was why I made the comment about Cadence getting more like Microsoft.

     

    Thanks,

    --lin

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