Mentor v8.6_4 User Manual

FastScan and FlexTest Reference Manual, V8.6_4

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Each test procedure force event time on a non-clock pin corresponds to the
force_pi time in the super timeplate.

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The measure_sco time in the shift procedure, which defines when the scan
output measure should occur, is zero.

In some tester formats (such as UTIC), you can specify a separate timing
definition for the shift procedure. In this case, the timing rules checker does not
consider the shift procedure for compliance with the constraints listed earlier.

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An integer time value specifying the final test cycle length. This number must
match the period of the shift procedure.

The following example specifies a timing definition that satisfies all the
constraints described previously. Note that the end_measure_cycle time is greater
than the measure_po time. Note also the absence of capture clocks in the timeplate
definition. FastScan generates patterns without capture clocks for testing IDDQ
faults and observing clock faults at a primary output pin.

Assume the timing file contains the following commands:

SET TIME SCALE 1 ns;
SET END_MEASURE_CYCLE TIME 500;  //matches period of shift
TIMEPLATE “tp4”

FORCE_PI 0;
BIDI_FORCE_PI 100;
WRITE_RAM_CLOCK_ON 200;
WRITE_RAM_CLOCK_OFF 300;
MEASURE_PO 400;
PERIOD 500;

END;
SET PROCEDURE FILE “g1” “design.g1”;