User manual CADENCE DESIGN SYSTEMS PSPICE SCHEMATIC

[. . . ] PSpice Schematics Schematic Capture Software User's Guide Copyright © 1985-2000 Cadence Design Systems, Inc. Trademarks Allegro, Ambit, BuildGates, Cadence, Cadence logo, Concept, Diva, Dracula, Gate Ensemble, NC Verilog, OpenBook online documentation library, Orcad, Orcad Capture, PSpice, SourceLink online customer support, SPECCTRA, Spectre, Vampire, Verifault-XL, Verilog, Verilog-XL, and Virtuoso are registered trademarks of Cadence Design Systems, Inc. Affirma, Assura, Cierto, Envisia, Mercury Plus, Quickturn, Radium, Silicon Ensemble, and SPECCTRAQuest are trademarks of Cadence Design Systems, Inc. All other brand and product names mentioned herein are used for identification purposes only and are registered trademarks, trademarks, or service marks of their respective holders. [. . . ] Click OK. 164 Changing Grid and Gravity Text Grid Text Grid allows you to set the grid spacing for text separately from the normal grid spacing. The text grid is usually set to some smaller percentage of the regular drawing grid. This allows you to align text along smaller increments of the regular grid. Enabling text grid and specifying text grid size 1 2 From the Options menu, select Display Options. Click OK. 165 Chapter 5 Using the Symbol Editor Zooming and Panning The zoom and pan features in the symbol editor are the same as they are in the schematic editor. Refer to Zooming and Panning in Schematics on page 3-68. 166 Printing Symbols Printing Symbols Printing a symbol 1 From the File menu, select Print to display the Print dialog box. File Menu 2 To select the part or parts to be printed, do the following: a b c Select the Current Symbol Only check box to print the symbol being edited. Click Select All Parts to print all parts in the open library. 3 In the Content Options frame, select the check box to enable printing. Select one of the Scaling options. · · 4 Auto-fit expands the symbol to full page size. User-definable enables you to specify the zoom factor for the size of the symbol. 5 6 Select an Orientation: Landscape or Portrait. Click OK. 167 Chapter 5 Using the Symbol Editor Table 13 Option Content Options Description specifies printing the graphics of the selected symbol specifies printing the attributes and the attribute values of the selected symbol specifies printing the description, type, Bbox dimensions, and origin position of the selected symbol specifies printing the pin data of the selected symbol Symbol Image Attributes Symbol Data Pin Data 168 Creating and Editing Symbols 6 Overview This chapter describes how to use the symbol editor to copy, create and edit symbols, which includes: Creating New Symbols on page 6-171 describes the four essential methods of creating a new symbol. Drawing Symbol Graphics on page 6-178 describes the assortment of drawing tools provided for creating and editing a symbol. Editing Existing Symbols on page 6-188 describes the editing features for defining and editing pins, and for defining and editing packaging definitions. Editing Symbol Attributes on page 6-197 describes how to add and edit the properties of a symbol. Using Symbol Aliases on page 6-200 describes how to give a symbol an alternate name. Specifying Part Packaging Information on page 6-201 describes procedures for defining packaging information. Chapter 6 Creating and Editing Symbols Configuring Custom Libraries on page 6-214 describes the procedure for making a custom library available in PSpice Schematics. 170 Creating New Symbols Creating New Symbols Following are the four methods for creating a new symbol: 1 Using the Symbol Wizard. · Use the wizard to create symbols from scratch. The wizard guides you through the steps for creating a symbol and also creates packaging information for the symbol. Use the wizard to create symbols automatically for existing models. · 2 3 4 Making a copy of an existing symbol under another name and modifying the copy. Importing a symbol definition exported by another PSpice Schematics user. Creating an A Kind Of (AKO) symbol, which is a reference of any existing symbol. Using the Symbol Wizard The Symbol Wizard helps you to create new symbols. Following are some of the features and benefits of using the Symbol Wizard: · · · · · If you are creating a symbol for an existing simulation model, refer to the Creating Symbols for Models chapter in your PSpice user's guide. eases the creation of symbols by guiding you through each step of the process provides simple point-and-click dialog boxes provides feedback as you make decisions avoids using complicated mouse or keyboard interactions enables you to navigate through the symbol creation process by backing up to repeat a step and moving forward 171 Chapter 6 Creating and Editing Symbols When you start the Symbol Wizard you are taken through a progression of screens, which provide you with information, ask you questions, and present you with choices, based on your selection in the first screen (shown below). Starting the Symbol Wizard 1 2 Note Symbol names cannot contain spaces. Follow the instructions that appear on the screen. 172 Creating New Symbols Creating a Symbol by Copying Another Symbol An easy way to create a symbol is to make a copy of a similar symbol and modify the copy. Making a Copy of a Symbol Copying a symbol from another library 1 From the Part menu, select Copy to display the Copy Part dialog box. Part Menu 2 Click Select Lib in the Open dialog box, and select a library. PSpice Schematics lists all of the library parts in the Parts box. 3 4 5 Type the name of the part to be copied in the Existing Part Name text box, or select it from the Part list. Saving the symbol places it in the current library. Creating a new symbol in a different library 1 2 From the Part menu, select Save to Library. [. . . ] A page may contain both parts (represented by symbols), port instances, connectors, and annotation symbols. Describes the symbol in terms of its symbol type, such as 2-input NAND. Refers to an occurrence of a symbol in a schematic. netlist nodeset off-page port origin package package library definition package type package type class page part part description part instance 334 ***Draft*** Glossary part outline pin Consists of the symbol for a part (graphics and pins), minus any text. Provides the pin number, the location of each pin relative to the symbol origin and the electrical attributes of the pin. [. . . ]