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FastScan and FlexTest Reference Manual, V8.6_4
2-418
Select Iddq Patterns Command Dictionary
measurements and those are the only patterns of interest, use the Set Iddq
Strobe -Label command to simulate only those patterns that contain an
IDDQ measure statement. This option is the default upon tool invocation. If
you wish to simulate all the patterns in the set with the assumption that
there is an IDDQ measurement at the end of each test cycle, use the Set
Iddq Strobe command with the -All option.
Use the Set Iddq Checks command to restrict IDDQ measurement to those
that satisfy the restrictions you specify.
2. The tool identifies all the IDDQ measurements that fall within the
boundaries that you specify by performing these steps:
a. The command identifies the IDDQ measurement that detects the most
faults from the simulation results. The command selects an IDDQ
measurement if it passes two tests: 1) it must detect the minimum
number of faults that you specify with the optional -Threshold switch,
and 2) the total number of selected IDDQ measurements cannot exceed
the number that you specify with the -Max_measures switch.
b. The tool then removes from the active fault list the faults that the fault
simulation detected for that measurement and places them in the
detected-by-simulation fault class.
c. The tool displays the normal fault simulation message for that
measurement.
d. The tool repeats the selection process until either it reaches the
maximum number of allowed IDDQ measurements, or the rest of the
remaining measurements fails to detect the minimum number of faults.
For FlexTest, the selection process will stop if the test_coverage
reaches the specified number.
During the fault simulation process the tool does not give credit for any
possibly-detected faults.
3. The tool performs a final fault grade for the internal patterns, giving
detection credit for only those patterns that contain the IDDQ measure