Mentor v8.6_4 manual Add Iddq Constraints, ∙ Cz

Add Iddq Constraints Command Dictionary

Add Iddq Constraints

Tools Supported: FastScan and FlexTest

FastScan Scope: Setup mode

FlexTest Scope: All modes

Usage

ADD IDdq Constraints {C0 C1 CZ} pinname... [-Model modelname]

Description

Sets constraints for generation or selection of IDDQ patterns.

Use the Add IDDQ Constraints command when you need constraints for either IDDQ test generation or pattern selection.

(FastScan Only): After using the Add IDDQ Constraints command to set your design constraints, you must use the Set Iddq

Note Checks -Atpg command to ensure IDDQ restrictions are applied during test generation.

Some CMOS models have some states for which they draw a quiescent current. You can use the Add Iddq Constraints command to prevent these undesirable states during the IDDQ measurement.

For test generation, you specify that the tool create patterns to detect the IDDQ faults by using the Set Fault Type command. For pattern selection, you use the Select IDDQ Patterns command.

Arguments

∙C0

A literal that restricts the pinname to a constant zero state.

∙C1

A literal that restricts the pinname to a constant one state.

∙CZ

A literal that restricts the pinname to a high-impedance state.

2-68 FastScan and FlexTest Reference Manual, V8.6_4