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1、IEEE Std 1076-2002 (Revision of IEEE Std 1076, 2000 Edition) IEEE Standards 1076 TM IEEE Standard VHDL Language Reference Manual Published by The Institute of Electrical and Electronics Engineers, Inc. 3 Park Avenue, New York, NY 10016-5997, USA 17 May 2002 IEEE Computer Society Sponsored by the Des
2、ign Automation Standards Committee IEEE Standards Print: SH94983 PDF: SS94983 Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 10/05/2007 02:26:31 MDTNo reproduction or ne
3、tworking permitted without license from IHS -,-,- The Institute of Electrical and Electronics Engineers, Inc. 3 Park Avenue, New York, NY 10016-5997, USA Copyright 2002 by the Institute of Electrical and Electronics Engineers, Inc. All rights reserved. Published 17 May 2002. Printed in the United St
4、ates of America. Print: ISBN 0-7381-3247-0 SH94983 PDF: ISBN 0-7381-3248-9 SS94983 No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. IEEE Std 1076-2002 (Revision of IEEE Std 1076, 2000 Edi
5、tion) IEEE Standard VHDL Language Reference Manual Sponsor Design Automation Standards Committee of the IEEE Computer Society Approved 21 March 2002 IEEE-SA Standards Board Abstract: VHSIC Hardware Description Language (VHDL) is defined. VHDL is a formal notation intended for use in all phases of th
6、e creation of electronic systems. Because it is both machine read- able and human readable, it supports the development, verification, synthesis, and testing of hard- ware designs; the communication of hardware design data; and the maintenance, modification, and procurement of hardware. Its primary
7、audiences are the implementors of tools supporting the lan- guage and the advanced users of the language. Keywords: computer languages, electronic systems, hardware, hardware design, VHDL Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELic
8、ensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 10/05/2007 02:26:31 MDTNo reproduction or networking permitted without license from IHS -,-,- IEEE Standards documents are developed within the IEEE Societies and the Standards Coordinating Committees of the IEEE Standards Association
9、 (IEEE-SA) Standards Board. The IEEE develops its standards through a consensus develop- ment process, approved by the American National Standards Institute, which brings together volunteers representing varied viewpoints and interests to achieve the fi nal product. Volunteers are not necessarily me
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25、le for identifying patents for which a license may be required by an IEEE standard or for conducting inquiries into the legal validity or scope of those patents that are brought to its attention. Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with
26、 IEEELicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 10/05/2007 02:26:31 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright 2002 IEEE. All rights reserved. iii IEEE-SA Trademark Usage/Compliance Statement Proper usage of the trademark IEEE Std 10
27、76-2002 is mandatory and is to be followed in all references of the Standard. The mark IEEE is the registered trademark of the Institute of Electrical and Electronics Engineers, Inc., and must be used in bold type. It is to appear with the registered trademark symbol “” the fi rst time “ IEEE ” appe
28、ars in the text. The use of “IEEE Std 1076-2002” should include the trademark symbol “TM” (e.g., IEEE Std 1076-2002 ) at least the fi rst time it is used in text, unless the number of the standard is also trademark registered (e.g., 802 ), then the symbol “” must be used. It is not permissible to us
29、e the standard number alone or with “ IEEE ” to indicate conformance or compliance with the associated standard. The user of the Standard should contact the Manager, Standards Licensing and Contracts for information concerning issues regarding indicating product compliance with an IEEE standard. To
30、represent that a product has been designed to meet an IEEE standard, it is permissible to state that “the product has been engineered, designed or manufactured with the intent to meet the requirements of IEEE Std 1076-2002 .” However, it is not permissible to state or refer to a product as “1076 com
31、pliant,” “1076 certifi ed,” “ IEEE 1076 conformant,” “ IEEE 1076 certifi ed,” or the like, unless the user has obtained a Certifi cation License from the IEEE. Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/11111110
32、01, User=Wing, Bernie Not for Resale, 10/05/2007 02:26:31 MDTNo reproduction or networking permitted without license from IHS -,-,- iv Copyright 2002 IEEE. All rights reserved. Introduction (This introduction is not part of IEEE Std 1076-2002, IEEE Standard VHDL Language Reference Manual.) The VHSIC
33、 Hardware Description Language (VHDL) is a formal notation intended for use in all phases of the creation of electronic systems. Because it is both machine readable and human readable, it supports the development, verifi cation, synthesis, and testing of hardware designs; the communication of hardwa
34、re design data; and the maintenance, modifi cation, and procurement of hardware. This document specifi es IEEE Std 1076-2002, which is a revision of IEEE Std 1076, 2000 Edition. This revision incorporates the addition of protected types and enhancements to the specifi cation of shared vari- ables wh
35、ich were completed in IEEE Std 1076, 2000 Edition. As VHDL is now in wide use throughout the world, the 1076 Working Group endeavored to maintain a high level of stability with this revision. Although this revision does not provide signifi cant changes to VHDL, it does enhance and clarify the langua
36、ge specifi - cation in several areas. Most notable is the improvement in the specifi cation of default binding rules, buffer ports, scope and visibility, allowance of multi-byte characters in comments and other areas which will increase the portability of descriptions. The maintenance of the VHDL la
37、nguage standard is an ongoing process. The chair of the VHDL Analysis and Standardization Group (VASG), otherwise known as the 1076 Working Group, extends his gratitude to all who have participated in this revision and encourages the participation of all interested parties in future language revisio
38、ns. If interested in participating, please contact the VASG at stds-vasgieee.org or visit the following website: http:/www.eda.org/pub/vasg. Participants The following individuals participated in the development of this standard: Stephen A. Bailey, Chair The following members of the balloting commit
39、tee voted on this standard. Balloters may have voted for approval, disapproval, or abstention. Peter J. Ashenden J. Bhasker Dennis Brophy Patrick K. Bryant Ernst Christen Wolfgang Ecker Masamichi Kawarabayashi Robert H. Klenke Satoshi Kojima Jim Lewis Paul J. Menchini Jean P. Mermet Gregory D. Peter
40、son Lance G. Thompson Alain Vachoux John Willis Peter J. Ashenden Stephen A. Bailey James A. Barby Victor Berman J. Bhasker Patrick K. Bryant Ernst Christen Timothy R. Davis Douglas D. Dunlop Robert A. Flatt Andrew Guyler William A. Hanna Donald F. Hanson Randolph E. Harr M. M. Kamal Hashmi Jim Heat
41、on Masaharu Imai Jake Karrfalt Masamichi Kawarabayashi Robert H. Klenke Satoshi Kojima Evan M. Lavelle Gunther Lehmann Dale E. Martin Timothy McBrayer Paul J. Menchini Jean P. Mermet Egbert Molenkamp John T. Montague Jaun Manuel Moreno Robert J. Myers Gregory D. Peterson Quentin G. Schmierer J. Denn
42、is Soderberg Scott Thibault Lance G. Thompson Eugenio Villar Ronald Waxman Ron Werner John Willis Mark Zwolinski Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 10/05/200
43、7 02:26:31 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright 2002 IEEE. All rights reserved. v When the IEEE-SA Standards Board approved this standard on 21 March 2002, it had the following membership: James T. Carlo, Chair James H. Gurney, Vice Chair Judith Gorman,
44、 Secretary *Member Emeritus Also included is the following nonvoting IEEE-SA Standards Board liaison: Alan Cookson, NIST Representative Satish K. Aggarwal, NRC Representative Andrew D. Ickowicz IEEE Standards Project Editor Sid Bennett H. Stephen Berger Clyde R. Camp Richard DeBlasio Harold E. Epste
45、in Julian Forster* Howard M. Frazier Toshio Fukuda Arnold M. Greenspan Raymond Hapeman Donald M. Heirman Richard H. Hulett Lowell G. Johnson Joseph L. Koepfi nger* Peter H. Lips Nader Mehravari Daleep C. Mohla Willaim J. Moylan Malcolm V. Thaden Geoffrey O. Thompson Howard L. Wolfman Don Wright Copy
46、right The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 10/05/2007 02:26:31 MDTNo reproduction or networking permitted without license from IHS -,-,- vi Copyright 2002 IEEE. All righ
47、ts reserved. Contents 0.Overview of this standard 1 0.1 Intent and scope of this standard 1 0.2 Structure and terminology of this standard 1 1.Design entities and configurations. 5 1.1 Entity declarations . 5 1.2 Architecture bodies 9 1.3 Configuration declarations. 12 2.Subprograms and packages 19
48、2.1 Subprogram declarations . 19 2.2 Subprogram bodies 22 2.3 Subprogram overloading 25 2.4 Resolution functions 27 2.5 Package declarations 28 2.6 Package bodies. 29 2.7 Conformance rules. 31 3.Types 33 3.1 Scalar types 34 3.2 Composite types. 40 3.3 Access types. 45 3.4 File types 48 3.5 Protected
49、 types. 50 4.Declarations. 55 4.1 Type declarations. 55 4.2 Subtype declarations 56 4.3 Objects. 57 4.4 Attribute declarations. 71 4.5 Component declarations. 72 4.6 Group template declarations 72 4.7 Group declarations. 73 5.Specifications. 75 5.1 Attribute specification 75 5.2 Configuration specificati