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Contents

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1

The Constraint Manager Assistant

Constraints Workspace Configuration

Constraints-Helper Workspace Configuration

An Introduction to Constraints

Virtuoso Unified Custom Constraints - A Use Model Overview

Constraint Manager Overview

Circuit Prospector Overview

The Constraint View

Constraint Name Column

Changing a Constraint View Name List

Constraint Storage

Ensuring that the Constraint View Is Editable

Introducing the Constraint Manager Assistant

Accessing the Constraint Manager

Constraint Manager Toolbar

Customizing Constraint Manager Assistant Content

Module Generator and Process Rule Editor Constraint Manager Options

Updating Constraints

Editing a Constraint in Associated Constraint Generator Dialog Box

Constraint Browser

Constraint Filters

Constraint Browser Features

Constraint Browser Context-Menus

Constraint Manager Options Form (Schematic)

Constraint Manager Options Form (Layout)

Constraint Browser Columns

Creating Constraints in the Constraint Manager

Constraint Creation Basics

Steps to Create Constraints in the Constraint Manager

Creating Constraints Using the BitSelector

Creating Constraints for Iterated Objects

Creating Modgen Constraints

Creating Constraints at Different Design Levels

Viewing Constraints in the Constraint Manager

Moving Constraints to Current or Sub-Cells

Overriding Constraints

Constraint Creation History

Virtuoso Custom Digital Placer and Creating Constraints on Pins/Pin Figures

Constraint Templates

Deleting Constraints

Saving and Storing Constraints (Schematics Only)

Switching On/Off Constraint Menu Options in Schematics XL File Menu

Selection and Cross-Selection of Constraints

Halo Highlighting

Configuring Constraint Halo Display

Adding Constraint Members

Deleting Constraint Members

Interactive Constraint Searching

Constraint Parameter Editor

Selecting and Displaying Constraints and Constraint Members in the Constraint Parameter Editor

Constraint History

Editing Constraint Parameters

Constraint Parameter Editor Status Visualization

Transferring Constraints Between Schematics and Layout

Using Schematic Constraints in Layout

Pushing and Pulling Constraints in a Schematic or Layout Hierarchy

Constraints vs. Rules

Using Constraint Notes

System-Defined Constraint Notes

User-Defined Constraint Notes for Constraints

User-Defined Constraint Notes for Templates

Registering Pre- and Post-Create Triggers for Constraint Notes

Creating Constraint Notes for a Complete Hierarchy

Working with Constraint Views in a Design-Managed Environment

Constraint Manager in Layout XL

Updating Constraints From Schematic to Layout

Comparing Constraints between Schematic and Layout

Overriding Process Rules

Creating a Cluster Boundary Using the Constraint Manager

Creating and Editing Net Constraints

Making Net Connections

2

The Circuit Prospector Assistant

An Introduction to the Circuit Prospector Assistant

Motivation

Storage

Accessing the Circuit Prospector

Circuit Prospector User Interface

The Circuit Prospector Constraint Creation Flow

Step 1: Select a circuit prospector category

Step 2: Select a finder to search for relevant design objects

Step 3: (Optionally) Filter/ select the found objects to apply constraints to

Step 4: Apply default action/ constraints to the selected objects

Circuit Prospector Flow Summary

Edit Finder Form

Edit Iterator Form

Edit Generator or Action Form

Capture Circuit Structure Form

Capturing New Structures

Editing Structures

Deleting Structures

Using Repeatable on a Captured Structure

Edit Match Expression Form

Edit Terminal Name Expression Form

Customization of the Circuit Prospector

Categories

Creating and Editing Categories

Detecting Current Paths and Creating Constraints

Finders

Creating Finders

Editing Finders

Deleting Finders

Iterators

Pre-Defined Iterators

Creating Iterators

Editing Iterators

Deleting Iterators

Constraint Generators

Pre-Defined Constraint Generators

Creating Constraint Generators

Editing Constraint Generators

Deleting Constraint Generators

3

The Process Rule Editor

Starting the Process Rule Editor

Process Rule Editor Graphical User Interface

Toolbar

Scope Selection Section

Browser Pane

Create Constraint Group Section

Create Process Rule Section

Dynamic Widget

Apply Constraint Group Section

Creating a Constraint Group

Customizing a Constraint Group

Creating a New Process Rule

Creating a New Process Rule in the Technology or Design Mode

Creating a New Process Rule for a Selected Object

Creating a New Process Rule for a Constraint

Copying an Existing Process Rule

Creating a Layer-Purpose Pair

Applying Valid LPPs Process Rule

Creating a Voltage Dependent Process Rule

Editing Existing Process Rule Values

Applying a Constraint Group

Setting the Precedence of a Constraint Group or Process Rule

Virtuoso Generated Constraint Groups

Applying a Virtuoso Generated Constraint Group

Applying an Existing Constraint Group to a Selected Object

Removing a Constraint Group or Process Rule

Saving Changes and Closing the Process Rule Editor

A

Default Constraint Types

Constraints in Virtuoso Schematic and Layout Editing Environment

Alignment

Area Pin Group Guide

Bus

Cell Boundary

Cluster

Cluster Boundary

Correlation

Diff Pair

Disable Permutation

Distance

Edge Pin Group Guide

Fixed

Guard Ring

High Precision C Extraction

High Precision R Extraction

Locked

Matched Capacitance

Matched Instance Color

Matched LDE Parameters

Matched Length

Matched Orientation

Matched Parameters

Max Capacitance

Max Coupling Capacitance

Max Resistance

Max Voltage Drop

Modgen

Net Class

Net Class Group

Net Class Hier Group

Net Priority

Orientation

Placement Path

Process Rule Overrides

Rail

Shielding

Symmetry

Voltage Synced Net

Delta Voltage

Assigning a Wire Type to a Net

Specifying the Color Mask for Critical Nets in Schematic

Using colorMask Constraint Parameter of msSameMask

Constraints in Virtuoso Parasitic Aware Design Environment

Parasitic Estimate

Parasitic Filter

Axis Parameter

Widths Minimum Parameter

Overriding the Widths Parameter Values

Allowed Width Ranges Form

Spacing Parameter

Overriding the Spacing Parameter Values

Parameter Types

Support of Shapes

B

Troubleshooting Constraints

Performance Issues

Read-Only Issues

Transfer and Migration Issues

Constraint Conflict Issues

C

Environment Variables

Setting Environment Variables

.cdsenv File

.cdsinit File

CIW

Displaying the Current Value of an Environment Variable

List of Environment Variables

addParallelDevices

autoConstraintNotes

autoSelectTemplateConstraint

comanageConstraintView

comanageFollowModeOnDescend

comanageFollowModeOnOpen

consistencyFailureDefaultWarning

constraintMenuHistorySize

constraintNotesSyncOnDesignCheck

constraintNotesSyncOnDesignOpen

crossCoupleDiffPairRequireSourceNotSupply

crossHalo

currentMirrorIncludeDummies

defaultViewName

diffPairRequireSourceNotSupply

disableCICustomCGPopup

distanceMFactorExpansion

editTransferredTemplates

highlightCPResults

keepFigGroupMembersWithinSameCluster

matchedToIgnore

maxMatchesPerDevice

noteTooltipMaxCharWidth

noteTooltipMaxLines

purgeOnCloseCellView

restrictNetGroupMembership

updateConstraints

useOldComparisonReport

viewNameList

viewWithConfigCell

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