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Interface for SPECCTRA®

Copyrights Software, documentation and related materials: Copyright © 2006 Altium Limited This software product is copyrighted and all rights are reserved. The distribution and sale of this product are intended for the use of the original purchaser only per the terms of the License Agreement. This document may not, in whole or part, be copied, photocopied, reproduced, translated, reduced or transferred to any electronic medium or machine-readable form without prior consent in writing from Altium Limited. U.S. Government use, duplication or disclosure is subject to RESTRICTED RIGHTS under applicable government regulations pertaining to trade secret, commercial computer software developed at private expense, including FAR 227-14 subparagraph (g)(3)(i), Alternative III and DFAR 252.227-7013 subparagraph (c)(1)(ii). P-CAD is a registered trademark and P-CAD Schematic, P-CAD Relay, P-CAD PCB, P-CAD ProRoute, P-CAD QuickRoute, P-CAD InterRoute, P-CAD InterRoute Gold, P-CAD Library Manager, P-CAD Library Executive, P-CAD Document Toolbox, P-CAD InterPlace, P-CAD Parametric Constraint Solver, P-CAD Signal Integrity, P-CAD DesignFlow, P-CAD ViewCenter, Master Designer, and Associate Designer are trademarks of Altium Limited. SPECCTRA in a registered trademark of Cadence Design Systems, Inc. All other brand names are trademarks of their respective companies. Altium Limited www.altium.com

P-CAD Interface for SPECCTRA® This manual explains how to use the P-CAD SPECCTRA autorouter (SP6, SP10, SP4, and SP2) interface. These autorouters work differently than other P-CAD autorouters. For SPECCTRA, there are no interactive functions as with P- CAD PRO Route. SPECCTRA is driven by a command file called a DO file. You set up a DO file using the Route Autorouters dialog. When you start running SPECCTRA, P- CAD PCB runs the autorouter as a separate Windows process. Saving your Design You must save your design in P-CAD ASCII format. P-CAD PCB then translates this format into the native SPECCTRA format. Upon termination of the autorouter, PCB merges the original PCB ASCII file with the routes produced by the autorouter. The resultant file is your routed design. If you start running SPECCTRA and the design is not currently in P-CAD ASCII format, you are given the option to have P-CAD automatically save the design in ASCII format or abort the routing operation. P-CAD Interface for SPECCTRA® 1

Route Autorouters Dialog When you select the SPECCTRA autorouter from the Autorouters combobox, the Route Autorouters dialog appears as follows: setting up the SPECCTRA autorouter This dialog is designed to simplify creating DO files, building net classes, and specifying command line options. SPECCTRA uses a different command file format called a DO file to define the routing strategy. The Strategy button in this dialog is replaced with a DO File button. DO File Button The DO File is an ASCII file that contains SPECCTRA commands that execute in sequence to control autorouting. It includes all data needed by the autorouter to route the board. The DO filename initially appears as the same name as the current design file, but with an .DO extension. This is the default filename. 2 P-CAD Interface for SPECCTRA®

Output PCB File Button The Output PCB File button displays a dialog in which you can specify the name and location of your output design file after it has been routed. Here too, a default name has been provided. The letter R (for routed) precedes the current design filename. The last character is dropped if the new name exceeds eight characters. The default file extension is .PCB. The default name can be overridden by clicking the Output PCB File button. The dialog which appears allows you to specify the name and location of your routed PCB board. Output Log File Button In addition to the output file, the SPECCTRA autorouter generates a report file at the end of the routing session, detailing the results of the session. The Output Log File button displays the Select Output Log File dialog, in which you can specify the name and location of your report file. Load Button Select the Load button to restore saved DO files. Choose the DO filename, then click Load. The DO file is then read into memory and may be edited as text or through the DO Wizard. Save Button Anytime after you have selected a DO filename, you can save the file by clicking Save. The DO file is also saved automatically when you start the route. Set Base Button The Set Base button returns the DO and output files to their default filenames. This is a simple way to go back and start P-CAD Interface for SPECCTRA® 3

over again when assigning filenames. The default names are derived from the design filename, including the full path. DO Wizard The easiest way to create or manipulate a DO file is by clicking the DO Wizard button. The SPECCTRA DO File Wizard dialog appears. The SPECCTRA DO File Wizard dialog is an intelligent DO file editor that makes creating and modifying DO files more efficient. Setting up a do file From this dynamic dialog you can select DO commands, modify or delete commands from the DO file, or add new commands to the DO file. You enter information and add information to the DO file without having to edit DO file text directly. The DO commands chosen closely match those of other P-CAD autorouters. The DO Wizard creates commands with the correct syntax. Refer to your SPECCTRA User's Guide and Reference Manual for a complete discussion on DO file options and use. The DO Wizard has an Auto Create DO File button that allows you to quickly create a DO file complete with current grid, line width and layer settings. 4 P-CAD Interface for SPECCTRA®

Edit as Text You can click the Edit as Text button to bring up the file in a text editor. The DO file created or modified in this manner is used verbatim as input to the SPECCTRA autorouter. Net Classes Button The option lets you define a group of nets that share common rules. Collections of nets sharing the same rules are referred to as a net class. When you click the Net Classes button, the Net Classes dialog appears. Defining net classes P-CAD Interface for SPECCTRA® 5

This class editor allows you to create named net classes using pre-defined clearance rules or pre-defined SPECCTRA autorouter clearance rules and then assign nets to that class. You can also add user-defined attributes to the net classes for your own use. PCB Design Rules Checking verifies clearances and the attributes listed below when they have been defined in the net class: MaxNetLength MaxVias MinNetLength ViaStyle Width For net clearances the rules can be further refined by specifying clearance rules for pairs of objects, like pad to pad clearances or line to via clearances. To create named net classes: 1. Enter a class name in the Classes box. 2. Click Add. 3. To include a net from the Unassigned Nets area to the new net class you may use any of the following methods: Select a single net and click the Add button. Double click on a net to move it from Unassigned to Nets in this Class and vice versa. 6 P-CAD Interface for SPECCTRA®

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