FastScan and FlexTest Reference Manual, V8.6_4
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Set Stability Check Command Dictionary
Set Stability Check
Tools Supported: FastScan
Scope: All modes
Usage
SET STability Check ON | Shift_analysis | All_shift | OFf
Description
Specifies whether the tool checks the effect of applying the main shift procedure
on non-scan cells.
In order to perform scan chain tracing, design rule checking sometimes requires
values to be present from non-scan state elements. For example, a control register
in a test controller, such as a JTAG TAP, needs to be checked to see that the TAP
register holds state during the shift procedure. By default, this checking is
performed. The level of checking is controlled by this command.
Arguments
•ON
A literal that enables the tool to perform a fast check of the effect of applying
the main shift procedure on non-scan cells. This is the default behavior upon
invocation of the tool.
•Shift_analysis
A literal that enables the tool to perform the next level of checking. The main
shift procedure is simulated once regardless of the number of times the
procedure says to apply it. Any cell which changes is marked as disturbed and
its output changed to “X”. The process is iterated until it converges.
•All_shift
A literal that enables the tool to perform the most detailed level of checking.
The main shift procedure is simulated for as many applications as the
procedures call for. When you specify this option, it can significantly increase
your run time.