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Timing Command Dictionary
SET SPLIT_MEASURE_CYCLE TIME
FastScan and FlexTest Reference Manual, V8.6_4
A-15
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 non-scan cycle at the
measure time.
measure time.
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.
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.
command on the test procedure test cycles.
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.
end of the load_unload procedure. All other measure_sco events for shift cycles
occur at the end of the previous shift cycles.
load_unload
shift #1
shift #N
. . .
measure_sco
measure_sco
(repeatedly
apply shift)
apply shift)
capture
clock
clock
capture_clock_on