Mentor v8.6_4 manual Set Random Weights, SET RAndom Weights percentageof1states

Command Dictionary Set Random Weights

Set Random Weights

Tools Supported: FastScan

Scope: Atpg, Fault, and Good modes

Usage

SET RAndom Weights percentage_of_1_states

Description

Specifies the default random pattern weighting factor for primary inputs.

The Set Random Weights command specifies the percentage of patterns for which FastScan places a primary input at a one-state. This is referred to as the random weight factor and does not affect any primary inputs that you place in the random weight list by using the Add Random Weights command. You can use the Report Random Weights command to display the current weighting factors for primary inputs in the random weight list.

You use the Set Random Weights command primarily for simulating Built-In Self Test (BIST) circuitry.

Arguments

∙percentage_of_1_states

A required floating point number, between 0.0 and 100.0, that specifies the percentage of patterns for which FastScan places a primary input at a one-state. The default value upon invocation of FastScan is 50.

Examples

The following example sets the default weighting factor for all other primary inputs in order to perform testability analysis:

set system mode fault

add random weights 100.00 indata2 add random weights 25.00 indata4 set random weights 75.00

report random weights set random patterns 612 insert testability

FastScan and FlexTest Reference Manual, V8.6_4 2-563