Timing Command Dictionary | SET SPLIT_MEASURE_CYCLE TIME |
|
|
SET SPLIT_MEASURE_CYCLE TIME
Scope: Enables special timing rules checking
Usage
SET SPLIT_MEASURE_CYCLE TIME integer
Description
Specifies the period for test procedures and splits the
Certain tester formats, such as TDL 91, expect all measures to occur last in the tester cycle. However, the scan output pin comparison always occurs in the shift procedure prior to the shift clock application. The tester should measure scan output pins in the shift procedure at time zero. Therefore, when you specify this command, the test pattern formatter safely moves the scan output measure event (measure_sco) so that it is the last event in the previous cycle. The first measure_sco event moves to the end of the load_unload procedure cycle and each succeeding measure_sco event moves to the previous shift procedure cycle.
Figure A-2 depicts the effect of the SET SPLIT_MEASURE_CYCLE TIME command on the test procedure test cycles.
| load_unload | shift #1 |
| (repeatedly | shift #N | |||
|
|
|
|
| apply shift) |
|
|
|
clock |
|
| . . . |
|
|
| ||
capture |
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
capture_clock_on
measure_scomeasure_sco
Figure A-2. Scan Event Timing for SET SPLIT_MEASURE_CYCLE
TIME
Note that the measure_sco event for the first shift procedure cycle occurs at the end of the load_unload procedure. All other measure_sco events for shift cycles occur at the end of the previous shift cycles.
FastScan and FlexTest Reference Manual, V8.6_4 |
