Altium Designer Documentation

Working with the Length Design Rule on a PCB in Altium Designer

Created: September 25, 2019 | Updated: September 26, 2019
All Contents

Rule Category: High Speed

Rule Classification: Unary

Summary

This rule specifies the minimum and maximum lengths of a net.

All design rules are created and managed within the PCB Rules and Constraints Editor dialog. For a high-level view of working with the design rules system, see Constraining the Design - Design Rules. For detailed information regarding how to target the objects that you want a design rule to apply to, see Scoping Design Rules.

Constraints

Default constraints for the Length rule.

  • Length Units - choose this option to define the length as a distance.
  • Delay Units - choose this option to define the length as a time (how long the signal takes to travel along that length of route). 
  • Minimum - the value for the minimum permissible length of the net.
  • Maximum - the value for the maximum permissible length of the net.

How Duplicate Rule Contentions are Resolved

All rules are resolved by the priority setting. The system goes through the rules from highest to lowest priority and picks the first one whose scope expression matches the object(s) being checked.

Rule Application

Online DRC and Batch DRC.

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