Fabrication and Assembly Testpoint Usage

Rule category: Testpoint

Rule classification: Unary

Summary

The Fabrication Testpoint Usage and Assembly Testpoint Usage design rules specify which nets require testpoints for bare-board fabrication testing or in-circuit assembly testing respectively. The constraints between these two rules are identical.

Constraints

Default constraints for the Fabrication and Assembly Testpoint Usage rule.

• Required – each target net must have a testpoint assigned. You can further sub-specify whether only a single testpoint is required for each net, or whether a testpoint is to be inserted at each 'leaf' node in a target net (pad/via locations that terminate a route). In addition, you can specify that a target net can have more testpoints, although these must be manually assigned.

• Prohibited – each target net must not have a testpoint assigned.

• Don't Care – each target net can have a testpoint assigned. It does not matter if a testpoint cannot be assigned to a 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

This rule is obeyed by the Autorouter, the Online and Batch DRC, and during output generation.

Notes

1. A DRC report, obtained from running a Batch DRC, can be used to identify each net that fails this rule.