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Contents

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1

Relative Object Design Concepts

Introduction

Using ROD Functions Versus Database Functions

Creating Parameterized Cells with ROD Functions

Named Objects

Hierarchical Name

Handles on ROD Objects

System-Defined Handles

User-Defined Handles

Aligning Objects

When Are ROD Alignments Recalculated?

Separating Aligned ROD Objects

ROD Objects in Hierarchy

Querying Objects for Alignments

Stretchable Parameterized Cells

The Stretchable Pcell Process

Assigning Handles

Specifying Environment Variables for Stretchable Pcells

Specifying the Frequency of Pcell Regeneration

Results of Stretching a Handle

Displaying Pcell Stretch Handles

Stretch PCell Custom Vias

Accessing Stretch Handles in SKILL

Multipart Rectangles

Connectivity for Multipart Rectangles

System-Defined Handles for Multipart Paths

Multipart Rectangles as ROD Objects

Creating a Multipart Rectangle from Other Objects

Editing Multipart Rectangles

Multipart Paths

Types of Subparts

Master Paths

Offset Subpaths

Enclosure Subpaths

Sets of Subrectangles

Ends of Paths and Subrectangles

Keeping Subrectangles Out of the Corners of Subrectangle Subpaths

Making Paths Choppable

Connectivity for Multipart Paths

System-Defined Handles for Multipart Paths

Multipart Paths as ROD Objects

Creating a Path from Other Objects

Editing Multipart Paths

Creating Objects from Objects

Creating a Rectangle from Another Object

Creating a Polygon from Another Object

Creating a Path from Another Object

Connectivity

Maintaining Connections for ROD Objects

Preserving Maintained Connections

2

Accessing Information about ROD Objects

About ROD Objects and ROD Object IDs

Getting the ROD Object ID

Getting the ROD Object ID Interactively

Storing the ROD Object ID as a Variable (Avoid)

Checking Whether an Object Is a ROD Object

Accessing ROD Object Attributes

Accessing Subpart Attributes

Examples of Using ~> to Display Information

Getting System-Defined Handle Values with a Script

Getting User-Defined Handle Names with a Script

rodCoord Objects

A

Using Relative Object Design Functions

Aligning ROD Objects Using rodAlign

Creating Handles Using rodCreateHandle

Creating Paths with rodCreatePath

Creating Objects Using rodCreateRect

Creating a Named Rectangle

Creating a Multipart Rectangle with Rows/Columns of Master Rectangles

Filling Bounding Boxes with Master Rectangles

Creating Rectangles on a Terminal and Net

Creating Rectangular Pins

Using rodGetObj

Naming Shapes Using rodNameShape

Unaligning All Zero-level Shapes in a Cellview Using rodUnAlign

Unnaming All Named Shapes in a Cellview Using rodUnNameShape

Converting Multipart Path to Polygon Using dbConvertPathToPolygon

Solutions to Problems

Solutions for rodAlign

Solutions for rodCreateHandle

Solutions for rodCreatePath

Solutions for rodCreateRect

Solutions for rodGetObj

Solutions for rodNameShape

B

Accessing the Cellview ID

Getting the Cellview ID

C

Using Design Rules in ROD Functions

Using Design Rules for Default Values

Accessing Design Rules with techGetSpacingRule

D

Using Environment Variables with ROD

Checking the Value of a ROD Environment Variable

How the System Evaluates ROD Environment Variables

Changing the Settings of ROD Environment Variables

List of ROD Environment Variables

displayStretchHandles

distributeSingleSubRect

preserveAlignInfoOn

rodAutoName

stretchDuplicateHandles

stretchHandlesLayer

traceTriggerFunctionsOn

updatePCellIncrement

E

How Virtuoso Layout Editor Works with ROD Objects

F

Displaying Pin Names in a Layout Window

Setting the Pin Names Environment Variable in .cdsenv

Turning On Pin Names in the Display Options Form

G

Code Examples

Using ROD to Create Multipart Paths

Using Stretchable Pcells

Creating a Bus

Creating a Contact Array

Creating a Guard Ring

Creating a Shielded Path

Creating a Transistor

Getting the Resistance for a ROD Path

getRodPathLength Procedure

createResHandle Procedure

Stretchable MOS Transistor

Code for simplemos Transistor

Code for contcov User-Defined Function

Code for myStretch User-Defined Function

H

Troubleshooting

Warnings in the CIW

Template templateName is replacing an existing template by the same name

Creating instance forces unname of ROD object

ROD object ID changes after Undo

Dialog Box Messages

Why is a dialog box asking about saving the technology file?

Index

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