User's Manual

Timing Command Dictionary SET SPLIT_MEASURE_CYCLE TIME
FastScan and FlexTest Reference Manual, V8.6_4
A-17
Arguments
• integer
The time value at which to split the cycle. This number must match the period
of the shift procedure.
Examples
The following FastScan example writes out a pattern set that tests for transition
faults. When init_force_pi is the first non-scan event in the cycle, FastScan splits
the ATPG non-scan cycle into two cycles. The first cycle includes only the
init_force_pi event, while the second cycle begins with the force_pi and includes
the remaining events in the non-scan cycle. When specified in the timing file, the
SET SPLIT_MEASURE_CYCLE TIME command further splits each of these
two cycles, causing the measure_po event to be the last event of the new test
cycle.
So the timeplate timing definition should specify that the force_pi event time
equals 2*test_cycle_length. Also, the period of the whole ATPG cycle should
equal 4*test_cycle_length. These calculations assume the SET
SPLIT_MEASURE_CYCLE command specifies test_cycle_length.
This example demonstrates the proper timing definition for this situation.
//FastScan application commands
add scan group g1 ckt2.tp
add scan chain c1 g1 SI SO
set fault type transition
add clocl 1 clks
add clocl 0 clk
set DRC handling C2 war
set system mode atpg
add faults -all
run
save patterns pattern_file -replace time_file -Zycad -serial
//Timing file “time_file”
set time scale 1 ns;
Timeplate "tp0" =
init_force_pi 0;
force_pi 400;
measure_po 520;