Mentor v8.6_4 manual Select Iddq Patterns

Command Dictionary Select Iddq Patterns

Select Iddq Patterns

Tools Supported: FastScan and FlexTest

Scope: Atpg mode

Prerequisites: You must have set the fault type to IDDQ by using the Set Fault Type -Iddq command. Also, you must use either the internal or external pattern source; you cannot use the random or BIST pattern source. You can set the pattern source to internal or external by using the Set Pattern Source command with either the -Internal or -External switch.

Usage

For FastScan

SELect IDdq Patterns [-Max_measures number] [-Threshold number] [-Eliminate -Noeliminate]

For FlexTest

SELect IDdq Patterns [-TEst_coverage [integer]] [-Max_measures number] [-Threshold number] [-Percentage number] [-Window number] [-Eliminate -Noeliminate] [-EXhaustive -Incremental]

Description

Selects the patterns that most effectively detect IDDQ faults.

The Select Iddq Patterns command selects the patterns (cycles) that most effectively detect IDDQ faults, given an external or internal pattern set. If you set the pattern source to external, the tool places the patterns in the internal pattern set and does its modifications and selections on that internal set. The tool uses the following three-step selection process to select the most effective patterns:

1.The tool fault simulates the patterns in the current pattern source, without dropping faults, and stores the fault simulation results for all patterns, ignoring any possibly-detected faults.

You can modify the results of this process by preceding the Select Iddq Patterns command with the Set Iddq Strobe and Set Iddq Checks commands. If the pattern set already contains patterns with IDDQ

FastScan and FlexTest Reference Manual, V8.6_4 2-417