Working with the Undershoot - Falling Edge Design Rule on a PCB in Altium Designer

Rule category: Signal Integrity

Rule classification: Unary

Summary

This rule specifies the maximum allowable undershoot (ringing above the base value) on the falling edge of the signal.

Constraints

Default constraints for the Undershoot - Falling Edge rule.

• Maximum (Volts) - the value for the maximum permissible undershoot on the falling edge of the signal.

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

Batch DRC and during Signal Integrity analysis.