Mentor v8.6_4 manual Set Nonscan Model

Command Dictionary Set Nonscan Model

Set Nonscan Model

Tools Supported: FlexTest

Scope: Setup mode

Usage

SET NOnscan Model DRC HOLD INITX

Description

Specifies how FlexTest classifies the behavior of non-scan cells with the HOLD and INITX functionality during the operation of the scan chain.

By default, the Design Rules Checker (DRC) classifies the behavior of each non- scan cell during the operation of the scan chain. However, the DRC sometimes classifies non-scan cells with the HOLD capability as having the INITX functionality, which has the disadvantage of decreasing the test coverage.

Despite this decreased test coverage, there is an advantage to FlexTest classifying non-scan cells as INITX rather than as HOLD. The method that FlexTest uses for pattern compaction operates better with INITX gates rather than HOLD gates.

Thus, the Set Nonscan Model command allows you to choose between either better pattern compaction with the disadvantage of having a decreased test coverage, or not as good pattern compaction with the advantage of having a higher test coverage.

This command has no effect on non-scan cells that you identified with the Add Scan Model or Add Scan Instance commands.

FastScan and FlexTest Reference Manual, V8.6_4 2-533