minNotchSpanSpacing

Specifies a spacing between neighbor wires and a notch where the span of the legs on either side is less than notchSpan, and the legs are less than notchSpacing apart. The spacing applies to the portion of the neighbor wire which has a common parallel run length greater than 0 with the notch legs. In addition, even if the neighbor wires are farther away than the specified spacing, if there are two consecutive U-shaped notches where the span is less than notchSpan, and the legs are less than notchSpacing apart, it is considered a violation. However, if the length of the smallest notch is exceptNotchLength, and the outer edges of the notches has neighbor wires greater than or equal to minNotchSpanSpacing away, the rule does not apply.

minNotchSpanSpacing Quick Reference

Value Type

minNotchSpanSpacing constraints have a Value that represents the spacing, in user units, between a notch leg and a neighboring wire.

Parameters

• notchSpan (Value, required) The constraint applies when the span of the legs on either side of the notch is less than this value, in user units.
• notchSpacing (Value, required) specifies the spacing, in user units, between the legs. The constraint applies when the distance between the legs is less than this value, in user units.
• exceptNotchLength (Value, optional) specifies the exact notch length, in user units, at which this constraint does not apply, as long as neighbor wires are far enough away.

Examples

In this example, the minimum spacing is 0.1 μm between neighbor wires and a notch where the span of the legs on either side is less than 0.15 μm, and the legs are less than 0.12 μm apart. In addition, even if the neighbor wires are farther away than the specified spacing, if there are two consecutive U-shaped notches where the span is less than 0.15 μm, and the legs are less than 0.12 μm apart, it is considered a violation. However, if the length of the smallest notch is 0.13 μm and the distance between the outer edges of the notches and neighbor wires is greater than or equal to 0.1 μm, the rule does not apply.

set_layer_constraint -constraint minSpacing -layer Metal1 -Value 0.08

set_constraint_parameter -name notchSpan -Value 0.15
set_constraint_parameter -name notchSpacing -Value 0.12
set_constraint_parameter -name exceptNotchLength -Value 0.13
set_layer_constraint -constraint minNotchSpanSpacing \
  -layer Metal1 -Value 0.1

SPACING 0.08 ;

PROPERTY LEF58_SPACING
"SPACING 0.1 NOTCHSPAN 0.15 NOTCHSPACING 0.12
   EXCEPTNOTCHLENGTH 0.13 ; " ;

spacings( (minSpacing "Metal1" 0.08) ) ;spacings

spacings(
( minNotchSpanSpacing Metal1
  'notchSpan 0.15
  'notchSpace 0.12
  'exceptNotchLength 0.13
  0.1 )
); spacings

Related Topics

Spacing Constraints

check_space