Mentor v8.6_4 manual Set Loop Handling

Set Loop Handling Command Dictionary

Set Loop Handling

Tools Supported: FastScan and FlexTest

Scope: Setup mode

Usage

For FastScan

SET LOop Handling {Tiex [-Duplication {ON OFf}]} {Simulation [-Iterations n]}

For FlexTest

SET LOop Handling {{Tiex Delay} [-Duplication {ON OFf}]} Simulation

Description

Specifies how the tool handles feedback networks.

The Set Loop Handling command allows you to perform DRC simulation of circuits containing combinational feedback networks.

FastScan Specifics

The Set Loop Handling command specifies FastScan loop handling behavior by either inserting a TIE-X gate or by stabilizing the loop values through an iterative simulation process.

By using the -Tiex setting, you have the option to use gate duplication to reduce the impact that a TIE-X gate places on the circuit to break combinational loops. By default, this duplication switch is off.

The Simulation option allows you to enter the number of iterations used to stabilize the circuit. However, excessive values will have an impact on both performance and memory usage.

FlexTest Specifics

The Set Loop Handling command specifies FlexTest loop handling behavior by either 1) using a TIE-X gate to break the loop, or 2) inserting a delay element to break the loop, or 3) using a simulation process to identify the loop behavior.

2-524 FastScan and FlexTest Reference Manual, V8.6_4