Mentor v8.6_4 manual Select Iddq Patterns Command Dictionary

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

2-418 FastScan and FlexTest Reference Manual, V8.6_4