Mentor v8.6_4 Set Stability Check, SET STability Check on Shiftanalysis Allshift OFf, ∙ Allshift

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.

2-584 FastScan and FlexTest Reference Manual, V8.6_4