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Differential pair DRC within Constraints region

Mstrghettorigg

Hi all,

I'm setting a region in the BGA area for 4 mils spacing line/line.  My 90 ohm pair came out to be 3.7mil spacing so it violates this rule.  I know I can lower the constraints with in the region to meet this demand, but I prefer to keep the spec at 4 mils for rest of the traces.

I have checked the setting in Setup>constraints>modes>electrical options>Differential Pair Constraints which helps me maintain the line/space, but it still shows the DRC for line/line spacing for violating the 4 mil space.

Is there a way to avoid this DRC within this region without editing the region shape or adding another region?  

Also my default constraints are set to 5 mil spacing it does not DRC the diffpair gap.  it's only for the region area.

Please let me know if anyone has suggestions.

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  • mcatramb91

    Hello,

    If you change the Min Line Spacing (column to the left of Primary Gap) to 3.7mil you will not get spacing violation between the members of the Diff Pair if it violations the spacing rules.  This only applies to the members within the same Diff Pair as the spacing rules will still be maintained when nets from different Diff Pairs come in contact with each other.

    Hope this helps,
    Mike Catrambone

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  • mcatramb91

    Hello,

    If you change the Min Line Spacing (column to the left of Primary Gap) to 3.7mil you will not get spacing violation between the members of the Diff Pair if it violations the spacing rules.  This only applies to the members within the same Diff Pair as the spacing rules will still be maintained when nets from different Diff Pairs come in contact with each other.

    Hope this helps,
    Mike Catrambone

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