Mentor v8.6_4 User Manual
Command Dictionary
Set Random Weights
FastScan and FlexTest Reference Manual, V8.6_4
2-563
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.
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.
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.
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:
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
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