OrCAD® Flow Tutorial
Product Version 16.2
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in FAR52.227-14 and DFAR252.227-7013 et seq. or its successor.OrCAD Flow Tutorial
Contents
1
Introduction to the tutorial. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Objective of the tutorial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Using the tutorial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Installing design example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
What’s next . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Recommended reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2
Creating a schematic design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Objective . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Design example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Creating a design in Capture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Creating a project . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Creating a flat design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Creating a hierarchical design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Navigating through a hierarchical design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Processing a design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Adding part references . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Creating a cross reference report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Generating a bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Getting your design ready for simulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Adding Layout-specific properties 45
Design rules check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
What’s next . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Recommended reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
November 2008 3 Product Version 16.2OrCAD Flow Tutorial
3
Simulating a design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Objective . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Simulation using PSpice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Files generated by PSpice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Analysis types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Overview of the full adder design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Simulating the full adder design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Editing a simulation profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Running PSpice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Viewing Output Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Performing parametric analysis 68
Adding a variable circuit parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Adding a Plot Window Template marker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Setting up parametric analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Running the simulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Exporting output waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
What’s next . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Recommended reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
4
Board design using OrCAD Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Objective 78
Preparations in Capture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Running DRC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Creating Layout netlist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Creating a board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Launch Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Create the Layout board file . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Creating a board outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Placing components 87
Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
November 2008 4 Product Version 16.2OrCAD Flow Tutorial
Manual routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Autorouting using Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Autorouting using SPECCTRA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Post-processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Renaming components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Back annotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Cross probing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Generating output 101
Output files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Reports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
What’s next . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Recommended reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
5
Board design using OrCAD PCB Editor . . . . . . . . . . . . . . . . . . . . . . 105
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Objective 106
Preparations in Capture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Running DRC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Creating PCB Editor netlist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
To know more about PCB Editor, see the PCB Editor tutorial. To open the tutorial, from the
Start menu, choose Programs > OrCAD 16.0 > Tutorials > PCB Editor > Allegro PCB
Editor Tutorial.Creating a board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Creating a board outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Adding mounting holes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Placing components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Manual routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Autorouting using PCB Editor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Autorouting using SPECCTRA for OrCAD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Post-processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Renaming components manually . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Automatic Renaming of components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Back annotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
Cross probing and cross highlighting between PCB Editor and Capture . . . . . . . . . 136
November 2008 5 Product Version 16.2OrCAD Flow Tutorial
Generating output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
Output files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Reports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
What’s next . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
Recommended reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
Glossary 145
Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
November 2008 6 Product Version 16.2Introduction to the tutorial
1
This chapter consists of the following sections:
Objective of the tutorial
Using the tutorial
What’s next
Recommended reading
Objective of the tutorial
To enable users to evaluate the power of the OrCAD PCB
tools used in the Windows-based PCB design process. You
can use this tutorial to perform all the steps in the PCB design
process. The tutorial focuses on the sequence of steps to be
performed in the PCB design cycle for an electronic design,
starting with capturing the electronic circuit, simulating the
design with PSpice, through the PCB layout stages, and
finishing with the processing of the manufacturing output and
maintaining the design through ECO cycles.
Tasks covered in this tutorial may not cover all the features of
a tool. In this tutorial, the emphasis is on the steps that you will
need to perform in each OrCAD tool so that your design works
smoothly through the flow.
OrCAD Flow Tutorial 7Chapter 1 Introduction to the tutorial Product Version 16.2
The tutorial design example used in this tutorial works within
the limits of the demo version of tools available in the
OrCAD 16.2 CD.
Audience
This tutorial is useful for designers who want to use OrCAD
tools for the complete PCB design flow or for analog
simulation flow.
You can also benefit from the tutorial if you are a first-time user
of OrCAD Capture, PSpice, OrCAD Layout, OrCAD PCB
Editor, or SPECCTRA for OrCAD.
Using the tutorial
To run through the complete tutorial, you need the design
example and following tools:
OrCAD Capture
PSpice A/D
OrCAD Layout or OrCAD PCB Editor
SPECCTRA for OrCAD
All these tools are available in the Unison Ultra suite except
OrCAD PCB Editor, which is available in the OrCAD PCB
Designer suite .
Note: This tutorial does not cover the tasks included in
Capture CIS.
Installing design example
Unzip the flowtut.zip file provided with this tutorial.
The design files are available at
/doc/flowtut/tutorial_exampl
e.
8 OrCAD Flow TutorialProduct Version 16.2 Using the tutorial
When you expand the design, the following directory structure
will be created.
The partial directory contains files generated at the end of
Chapter 2, “Creating a schematic design.” Use the files in this
directory only if you want to skip the design creation steps
covered in Chapter 2 and directly move on to Chapter 3 or
Chapter 4.
The complete directory contains all the files generated
through all the chapters in this tutorial. You can use the files in
the complete directory to verify your results.
Terminology
OrCAD Capture OrCAD’s schematic design
tool
Capture (initial The terms OrCAD Capture
CAPS) and Capture have been
used interchangeably in
the tutorial.
PSpice OrCAD’s simulation tool,
used for simulating both
Analog and digital circuits.
OrCAD Layout OrCAD tool used for PCB
routing and floor-planning
Layout The terms OrCAD Layout
and Layout have been
used interchangeably in
the tutorial.
OrCAD Flow Tutorial 9Chapter 1 Introduction to the tutorial Product Version 16.2
OrCAD PCB Editor OrCAD tool used for PCB
routing and floor-planning.
PCB Editor The terms OrCAD PCB
Editor and PCB Editor
have been used
interchangeably in the
tutorial.
What’s next
In the next chapter, Creating a schematic, you will use
OrCAD Capture for creating a schematic design. You will learn
to perform basic design tasks such as adding components
from a library, adding wires, and getting your design ready for
simulation.
Recommended reading
For more information about design suite configurations
provided by OrCAD for affordable PCB design solutions, see
the OrCAD® Unison Suites Flow Guide. For information
about individual tools, see the respective User Guide.
10 OrCAD Flow Tutorial