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Contents

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1

Introduction to Fluid Guard Rings

Fluid Shapes: Concepts

Fluid Pcells

Fluid Guard Rings: Concepts

VLS-based Fluid Guard Rings

Custom Fluid Guard Rings

2

Fluid Guard Ring Infrastructure

Class Hierarchy in VFO Infrastructure

Implementation Class

Filling Class

Enclosure Class

Protocol Class

3

Pitch Support in Fluid Guard Ring

Overview of Pitch and Grid

Calculating the Fluid Shape Data using Pitch Parameters

Calculating the Centerline of Path Style Fluid Shape using Pitch Parameters

Calculating the Width of Path Style Fluid Shape using Pitch Parameters

4

Develop and Define a Fluid Guard Ring Device

Extending the VFO Infrastructure

Extending the Implementation Class

Extending the Filling Class

Defining Fluid Guard Ring Devices

Defining the Device Class

Declaring the Device

Specifying Device Properties

Adding or Modifying CDF Parameters

5

Customize Create Guard Ring Form

Modifying the Existing Create Guard Ring Form

Adding New User-Defined GUI Components to the Form

Updating the Existing GUI Components on the Form

Updating Properties of User-Defined GUI Components

Example: Hiding Existing Fields and Adding New Check Box to the Form

Pitch Parameter Support in the Create Guard Ring Form

Creating a New Create Guard Ring Form

Using the Create Guard Ring Form

Other SKILL Functons for Create Form Modifications

Triggers

Queues

Field Prompts in vfoGRSetCreateFormFieldProp SKILL Function

6

Write Customized Fluid Editing Commands

Defining Fluid Editing Commands

Pitch Handling Support for Editing Commands

Stretch Command

Merge Command

7

Methodology to Maintain Versions of Implementation Class

8

Fluid Guard Ring Packaging in PDK

Procedure for Initializing Customized FGR Devices

A

Best Practices for Developing a Fluid Guard Ring

B

Fluid Guard Ring Environment Variables

Setting Environment Variables

.cdsenv File

.cdsinit File

CIW

Displaying the Current Value of an Environment Variable

List of Environment Variables

fgrPostEditPitchCorrection

fgrWrapPlaceAtMinimumDistance

fluidGuardRingInstallPath

grEnclosedBy

grMode

keepGuardRingEndsConnected

vfoShowOnlyFluidShapeForDrag

C

Fluid Guard Rings Known Problems and Solutions

D

Performance Improvement in Tunnel Command

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