Virtuoso Schematic Composer Tutorial - Department of …

Virtuoso? Schematic Composer Tutorial

Product Version 5.0 June 2003

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Virtuoso Schematic Composer Tutorial

Contents

Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Related Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Typographic and Syntax Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

1 Installing the Tutorial Database . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Prerequisites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Overview of the Installation Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Your Working Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Copying the Installation Script . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Running the Installation Script . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Copying and Editing the Dot Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Copying the System-Specific Dot Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Editing the .cshrc File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Copying the Environment Dot File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Starting the Schematic Composer Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Setting the Paths to the Libraries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

2 Getting Started with Schematic Composer. . . . . . . . . . . . . . . . . . . . 21

About the Tutorial Libraries, Cells, and Cellviews . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Setting Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Opening the Schematic Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Viewing the Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Browsing the Schematic Hierarchy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Moving Down the Schematic Hierarchy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Moving Up the Schematic Hierarchy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Closing the Design and Quitting the Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

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3 Creating Symbols and Pins. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Creating a New Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Opening the top_level Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Placing the ALU Symbol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Creating the One's Complement Symbol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Creating the Accumulator Symbol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Placing the Accumulator Symbol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Placing the One's Complement Symbol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Adding the Schematic Input and Output Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Adding the DEC Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 Adding the Output Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

4 Adding Wires, Checking the Schematic, and Attaching a Border . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Wiring the Input Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 Wiring the ALU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 Naming the Nets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 Placing the Input Wire Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 Placing the Output Wire Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 Checking the Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Setting Up the Check Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 Running Check and Save . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 Identifying the Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 Naming the DEC Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 Creating a Sheet Border and Title . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 Creating a Border . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 Centering the Schematic within the Border . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 Adding a Name to the Title Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

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5 Creating the Accumulator Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . 77

About the Accumulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 Adding Instances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Adding Two 4-Bit Adder Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 Adding the 8-Bit Register Symbol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 Adding Power and Ground Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 Adding Wires and Buses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 Stretching the Register Symbol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 Wiring the Adders, Power Supply, and Ground Symbols . . . . . . . . . . . . . . . . . . . . . . 87 Moving the Schematic Pins for Space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 Drawing the Buses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 Wiring the CLK Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 Wiring the Adders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 Wiring the Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 Naming the Nets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 Naming the Nets That Tap the B Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 Naming the Nets That Tap the Y Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 Checking the Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

6 Creating the Analog Amplifier Schematic. . . . . . . . . . . . . . . . . . . . . 105

About the Analog Amplifier Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106 Creating the amp Schematic Cellview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

Adding Symbols for the Four Resistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107 Changing Resistor Parameter Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109 Adding a Capacitor and Changing Its Parameter Values . . . . . . . . . . . . . . . . . . . . . 111 Adding Symbols for the Power and Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112 Adding the Transistor Symbol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 Adding the I/O Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115 Aligning the Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116 Wiring the Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118 Cleaning Up the Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119 Adding CDF Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

June 2003

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Product Version 5.0

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