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Command Dictionary Select Iddq Patterns
FastScan and FlexTest Reference Manual, V8.6_4
2-417
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