Mentor v8.6_4 manual Analyze Control

Analyze Control Command Dictionary

Analyze Control

Tools Supported: FastScan

Scope: Atpg, Fault, and Good modes

Usage

ANAlyze COntrol

Description

Calculates zero and one-state controllability.

The Analyze Control command calculates the zero and one–state controllability by performing good circuit simulation for all gates in the design. Controllability coverage (either one or zero) is a measure of the percentage of times a gate can achieve a zero or one state for a set number of random patterns. You set the number of applied random patterns with the Set Random Patterns command. Gates should attain both zero and one states a reasonable number of times (the control threshold), which you determine and set with the Set Control Threshold command.

After issuing the Analyze Control command, you can display detailed information about individual gates by using the Report Control Data command. This information helps you identify circuit points that can increase the design’s controllability. You can then evaluate the effects of making these points control points by using the Add Control Points command and then reissuing the Analyze Control command.

You use this command primarily for developing Built-In Self Test (BIST) circuitry.

Examples

The following example calculates the controllable test coverage from gate values which fail to achieve a state of minimum number of patterns:

set system mode atpg set random patterns 612 set control threshold 5 analyze control

report control data

2-126 FastScan and FlexTest Reference Manual, V8.6_4