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1、SimulinkFixed PointFor Use with SimulinkModelingSimulationImplementationUsers GuideVersion 5How to Contact The MathWWebcomp.soft-sys.matlabN SProduct enhancement Bug Documentation error Order status, license renewals, Sales, pricing, and general information508-647-7000 (Phone)508-647-7001 (Fax)The M
2、athWorks, Inc. 3 Apple Hill Drive Natick, MA 01760-2098For contact information about worldwide offices, see the MathWorks Web site.Simulink Fixed Point Users Guide COPYRIGHT 19952006 by The MathWorks, Inc.The software described in this document is furnished under a license agreement. The software ma
3、y be used or copied only under the terms of the license agreement. No part of this manual may be photocopied or reproduced in any form without prior written consent from The MathWorks, Inc.FEDERAL ACQUISITION: This provision applies to all acquisitions of the Program and Documentation by, for, or th
4、rough the federal government of the United States. By accepting delivery of the Program or Documentation, the government hereby agrees that this software or documentation qualifies as commercial computer software or commercial computer software documentation as such terms are used or defined in FAR
5、12.212, DFARS Part 227.72, and DFARS 252.227-7014. Accordingly, the terms and conditions of this Agreement and only those rights specified in this Agreement, shall pertain to and govern the use, modification, reproduction, release, performance, display, and disclosure of the Program and Documentatio
6、n by the federal government (or other entity acquiring for or through the federal government) and shall supersede any conflicting contractual terms or conditions. If this License fails to meet the governments needs or is inconsistent in any respect with federal procurement law, the government agrees
7、 to return the Program and Documentation, unused, to The MathWorks, Inc.TrademarksMATLAB, Simulink, Stateflow, Handle Graphics, Real-Time Workshop, and xPC TargetBox are registered trademarks, and SimBiology, SimEvents, and SimHydraulics are trademarks of The MathWorks, Inc.Other product or brand na
8、mes are trademarks or registered trademarks of their respective holders.PatentsThe MathWorks products are protected by one or more U.S. patents. Please see more information.Revision History March 1995First PrintingNew for Version 1.0 April 1997Second PrintingRevised for MATLAB 5 January 1999Third P
9、rintingRevised for MATLAB 5.3 (Release 11) September 2000Fourth PrintingNew for Version 3.0 (Release 12) August 2001Fifth PrintingMinor revisions for Version 3.1 (Release 12.1) November 2002Sixth PrintingMinor revisions for Version 4.0 (Release 13) June 2004Seventh PrintingRevised for Version 5.0 (R
10、elease 14) (Renamed from Fixed-Point Blockset) October 2004Online onlyMinor revisions for Version 5.0.1 (Release 14SP1) March 2005Online onlyMinor revisions for Version 5.1 (Release 14SP2) September 2005Online onlyMinor revisions for Version 5.1.2 (Release 14SP3) March 2006Online onlyRevised for Ver
11、sion 5.2 (R2006a) May 2006Online onlyRevised for Version 5.2.1 (R2006a+) September 2006Online onlyRevised for Version 5.3 (R2006b)ContentsGetting Started 1 1What Is Simulink Fixed Point?. . . . . . . . . . . . . . . . . . . . . .1-2 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . .
12、 . . . . . . . . . .1-3 Sharing Fixed-Point Models. . . . . . . . . . . . . . . . . . . . . . . . .1-4 Demos. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5Physical Quantities and Measurement Scales. . . . . . . .1-8 Selecting a Measurement Scale. . . . . . . .
13、. . . . . . . . . . . . . .1-9 Example: Selecting a Measurement Scale. . . . . . . . . . . . . .1-10Why Use Fixed-Point Hardware?. . . . . . . . . . . . . . . . . . . .1-18Why Use Simulink Fixed Point?. . . . . . . . . . . . . . . . . . . . .1-20The Development Cycle. . . . . . . . . . . . . . . . .
14、 . . . . . . . . . . .1-21Simulink Fixed Point Features. . . . . . . . . . . . . . . . . . . . . .1-23 Configuring Blocks with Fixed-Point Support. . . . . . . . . . .1-23 Additional Features and Capabilities. . . . . . . . . . . . . . . . .1-33 Passing Fixed-Point Data Between Simulink Models and M
15、ATLAB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-34Example: Converting from Doubles to Fixed Point. . . .1-38 Block Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-38 Simulation Results. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-39Data Types and Scaling 2 2Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2vFixed-Point Numbers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3 Signed Fixed-Point Numbers. . . . . . . .
