Mentor v8.6_4 - page 714

FastScan and FlexTest Reference Manual, V8.6_4
4-10
FastScan Test Pattern File Format Test Pattern File Formats
Each scan pattern will have the property that it is independent of all other scan
patterns. The normal scan pattern will contain the following events:
1. Load values into the scan chains.
2. Force values on all non-clock primary inputs.
3. Measure all primary outputs not connected to scan clocks.
4. Exercise a capture clock. (optional)
5. Apply observe procedure (if necessary)
6. Unload values from scan chains.
Although the load and unload operations are given separately, it is highly
recommended that the load be performed simultaneously with the unload of the
preceding pattern when applying the patterns at the tester.
For observation of primary outputs connected to clocks, there will be an additional
kind of scan pattern that contains the following events:
1. Load values into the scan chains.
2. Force values on all primary inputs including clocks.
3. Measure all primary outputs that are connected to scan clocks.