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FastScan and FlexTest Reference Manual, V8.6_4
A-54
SET SPLIT_BIDI_CYCLE TIME Timing Command Dictionary
SET SPLIT_BIDI_CYCLE TIME
Scope: Enables special timing rules checking
Usage
SET SPLIT_BIDI_CYCLE TIME integer
Description
Specifies the period for test procedures and splits the non-scan cycle before the
force or bidi_force time.
Certain testers formats, such as UTIC and Compass Scan, do not allow state
changes on both input pins and bidirectional pins in a single tester cycle. In this
case, you must split each non-scan cycle into two tester cycles. The SET
SPLIT_BIDI_CYCLE TIME command enables the ASICVector Interfaces (AVI)
functionality to split the non-scan test cycle into two tester cycles when writing
patterns.
If you place this command in the timing file, the timing rules checker ensures
compliance to the following conditions:
• The period of all pins is twice that of the split_bidi_cycle time.
• The period of all scan test procedures equals the split_bidi_cycle time
multiplied by the number of cycles in the test procedure.
• The timing file contains the SET BIDI_FORCE TIME command to specify
bidirectional pin force times.
• All bidirectional pins have the same offset time.
• The split_bidi_cycle time is greater than the force time and less than or
equal to the bidirectional force time for each bidirectional pin.
• For each scan test procedure, each force event time on a clock pin
corresponds to the pair of force times specified in the timing file.
• For each scan test procedure, each force event on a non-clock pin
corresponds to the force time specified in the timing file.