Mentor v8.6_4 manual Set Atpg Compression

Command Dictionary Set Atpg Compression

Set Atpg Compression

Tools Supported: FastScan

Scope: All modes

Usage

SET ATpg Compression [OFf ON] [-Limit number] [-NOVerbose -Verbose] [-Abort_limit number] [-CONsecutive_fails number] [-SEq_merge_limit number]

Description

Specifies for the ATPG to perform dynamic pattern compression.

The Set Atpg Compression command minimizes, during the ATPG run, the number of required test patterns to achieve the desired test coverage. The test pattern generator does this by attempting to detect multiple faults with a single test pattern. This is called dynamic pattern compression and typically results in a pattern set smaller than one produced by any other method.

Note

Arguments

∙OFf

Turning dynamic ATPG pattern compression on with default settings can result in the ATPG process taking 2-3 times longer than usual. Thus, you should only use this feature if your original pattern set is unacceptably large, or when you are running the final pass to produce actual production vectors. For most efficient operation, you should use this command in conjunction with the Set Decision Order command.

An optional literal that specifies for FastScan to not perform ATPG compression during test pattern generation. This prevents FastScan from using each test pattern to detect multiple faults. This is the default.

∙ON

An optional literal that specifies for FastScan to perform ATPG compression during test pattern generation. This allows FastScan to use each test pattern to detect multiple faults.

FastScan and FlexTest Reference Manual, V8.6_4 2-427