IMPEDANCE_RULE
The IMPEDANCE_RULE property, attached to a net, specifies an impedance restriction between any two pins on a net or between any pin and Tpoint connection on a net. This property is used by DRC checking and routing.
If a connection has an impedance constraint specified by both an IMPEDANCE_RULE property and an electrical constraint set, the IMPEDANCE_RULE value is used. Use Constraint Manager for pin-pairs.
The format of the IMPEDANCE_RULE property in the $A_PROPERTIES section of a netlist is
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IMPEDANCE_RULE{ALL:ALL:impedance:tolerance:}... ; netname=A:B:C:D
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A:起点
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B:终点
- C:阻抗大小
- D:阻抗的误差大小
Specifies the checking of impedance of everyconnect line (cline) segment in the net. |
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Required. Specifies the impedance constraint value in ohmsexpressed as a decimal number. |
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Specifies the tolerance for an impedance value specified either as avalue in ohms or a percentage. You must follow a percentage with a % (percent sign). If you do not specify a value, 2% is assumed. |
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Specifies the name of the net to which the impedance applies. |
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