Mentor v8.6_4 manual Set Z Handling, ∙ Internal state, ∙ External state

Command Dictionary Set Z Handling

Set Z Handling

Tools Supported: FastScan and FlexTest

Scope: Setup mode

Usage

SET Z Handling {Internal state} {External state}

Description

Specifies how the tool handles high impedance signals for internal and external tri-state nets.

The Set Z Handling command specifies how to handle the high impedance state for internal and external nets. If the high impedance value can be made to behave as a binary value, certain faults may become detectable. If you do not use this command to set the Z handling, the default value is X.

Arguments

∙Internal state

A literal pair that specifies how the tool handles high impedance values for internal tri-state nets. The literal choices for the state option are as follows:

X — A literal that specifies to treat high impedance states as an unknown state. This is the default behavior upon invocation of the tool.

0 — A literal that specifies to treat high impedance states as a 0 state.

1 — A literal that specifies to treat high impedance states as a 1 state.

Hold (FlexTest Only) — A literal that specifies to hold the state previous to the high impedance.

∙External state

A literal pair that specifies how the tool handles high impedance values for external tri-state nets. The literal choices for the state option are as follows:

X — A literal that specifies not to measure high impedance states; they cannot be distinguished from a 0 or 1 state. This is the default behavior upon invocation of the tool.

FastScan and FlexTest Reference Manual, V8.6_4 2-599