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Get default via spacing and enclosures

TaherKotb

Hello,

I use dbCreateVia() function to create vias with variable cut Rows and Columns determined by the width of the path connected to the via in the layout view. In order to compute the cut Rows and Columns i need the via spacing and enclosure as inputs but these variables also change with the cut Rows and Columns values which i don't know.

Is there a skill function which allows to autmatically setup the array-side dependent via spacing rules and enclosures according to the input variable cut Rows and Cloumns? if not, is there any work around.

Thanks in advance 

Best Regards

Taher 

Parents
  • theopaone

     The values for the via spacing come from several constraints which you have to find from the techDB. The constraints I consider are minSpacing and minViaSpacing (for cutClass rules) for the "standard" spacing and viaSpacing for extra spacing for arrayed vias. I also get the width and length of the vias. Then I can calculate the number of vias in the rows and columns based on the "standard" spacing. If the rows and columns trigger the viaSpacing constraint, I change the spacing value and re-calculate.

    ROWS = fix( (areaWidth - viaWidth) / (viaWidth + viaHorizontalSpace) ) + 1

    COLUMNS = fix( (areaHieght - viaHeight ) / (viaHeight + viaVerticalSpace) ) + 1

     The viaSpacing is used if the number of adjacent cuts are greater than the constraint value. For a constraint value of 3, use the viaSpacing if ROWS > 1 and COLUMNS > 1. If the constraint value is 4, use the viaSpacing if the (ROWS > 1 && COLUMNS > 2) || (ROWS >  2 && COLUMNS > 1)

    Ted

Reply
  • theopaone

     The values for the via spacing come from several constraints which you have to find from the techDB. The constraints I consider are minSpacing and minViaSpacing (for cutClass rules) for the "standard" spacing and viaSpacing for extra spacing for arrayed vias. I also get the width and length of the vias. Then I can calculate the number of vias in the rows and columns based on the "standard" spacing. If the rows and columns trigger the viaSpacing constraint, I change the spacing value and re-calculate.

    ROWS = fix( (areaWidth - viaWidth) / (viaWidth + viaHorizontalSpace) ) + 1

    COLUMNS = fix( (areaHieght - viaHeight ) / (viaHeight + viaVerticalSpace) ) + 1

     The viaSpacing is used if the number of adjacent cuts are greater than the constraint value. For a constraint value of 3, use the viaSpacing if ROWS > 1 and COLUMNS > 1. If the constraint value is 4, use the viaSpacing if the (ROWS > 1 && COLUMNS > 2) || (ROWS >  2 && COLUMNS > 1)

    Ted

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