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Command Dictionary Set Nonscan Model
FastScan and FlexTest Reference Manual, V8.6_4
2-533
Set Nonscan Model
Tools Supported: FlexTest
Scope: Setup mode
Usage
SET NOnscan Model DRC | HOLD | INITX
Description
Specifies how FlexTest classifies the behavior of non-scan cells with the HOLD
and INITX functionality during the operation of the scan chain.
By default, the Design Rules Checker (DRC) classifies the behavior of each non-
scan cell during the operation of the scan chain. However, the DRC sometimes
classifies non-scan cells with the HOLD capability as having the INITX
functionality, which has the disadvantage of decreasing the test coverage.
Despite this decreased test coverage, there is an advantage to FlexTest classifying
non-scan cells as INITX rather than as HOLD. The method that FlexTest uses for
pattern compaction operates better with INITX gates rather than HOLD gates.
Thus, the Set Nonscan Model command allows you to choose between either
better pattern compaction with the disadvantage of having a decreased test
coverage, or not as good pattern compaction with the advantage of having a higher
test coverage.
This command has no effect on non-scan cells that you identified with the Add
Scan Model or Add Scan Instance commands.