IEEE Standard VHDL Language_2008.pdf

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IEEE Standard VHDL Language Reference Manual IEEE Computer Society Sponsored by the Design Automation Standards Committee M T 6 7 0 1 IEEE 3 Park Avenue New York, NY 10016-5997, USA 26 January 2009 IEEE Std 1076™-2008 (Revision of IEEE Std 1076-2002) Authorized licensed use limited to: Gonzaga University. Downloaded on April 26,2014 at 16:54:29 UTC from IEEE Xplore. Restrictions apply.

Authorized licensed use limited to: Gonzaga University. Downloaded on April 26,2014 at 16:54:29 UTC from IEEE Xplore. Restrictions apply.

IEEE Std 1076™-2008 (Revision of IEEE Std 1076-2002) IEEE Standard VHDL Language Reference Manual Sponsor Design Automation Standards Committee of the IEEE Computer Society Approved 26 September 2008 IEEE SA-Standards Board Authorized licensed use limited to: Gonzaga University. Downloaded on April 26,2014 at 16:54:29 UTC from IEEE Xplore. Restrictions apply.

Acknowledgments The editing and technical work done on the 2008 revision of this standard was done in collaboration between Accellera VHDL Technical Subcommittee and the IEEE VHDL Analysis and Screening Committee (VASG). Accellera had donated all of its work and copyrights back to the IEEE. Material in clause titled “Protect Tool Directives” is derived from the document titled “A Mechanish for VHDL Source Protection” © 2004, Cadence Design Systems Inc. Used, modified, and reprinted by permission of Cadence Design Systems Inc. The packages FIXED_GENERIC PKG, FIXED_PKG, FLOAT_GENERIC_PKG, FLOAT_PKG, and FIXED_FLOAT_TYPES were modified and used with permission from Eastman Kodak Company © 2006. Material in annex clauses titled “Using the fixed-point package” and “Using the floating- point package” is derived from the documents titled “Fixed Point Package User’s Guide” and “Floating Point Package User’s Guide” by Eastman Kodak Company © 2006. Used, modified, and reprinted by permission of Eastman Kodak Company. The package STD_LOGIC_TEXTIO was modified and used with permission of Synopsys, Inc. © 1990, 1991, and 1992. Abstract: VHSIC Hardware Description Language (VHDL) is defined. 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, verification, synthesis, and testing of hardware designs; the communication of hardware design data; and the maintenance, modification, and procurement of hardware. Its primary audiences are the implementors of tools supporting the language and the advanced users of the language. Keywords: computer languages, electronic systems, hardware, hardware design, VHDL The Institute of Electrical and Electronics Engineers, Inc. 3 Park Avenue, New York, NY 10016-5997, USA Copyright © 2009 by the Institute of Electrical and Electronics Engineers, Inc. All rights reserved. Published 26 January 2009. Printed in the United States of America. IEEE and POSIX are registered trademarks in the U.S. Patent & Trademark Office, owned by the Institute of Electrical and Electronics Engineers, Incorporated. MagicDraw and No Magic, Inc., are registered trademarks of No Magic, Inc. in the United States and other countries. TRI-STATE is a registered trademark of National Semiconductor Corporation. 2nd Printing 29 July 2011. The following ISBNs were incorrect in the 1st Printing of 26 January 2009. PDF: Print: The correct ISBNs are: PDF: Print: ISBN 978-0-7381-5800-6 ISBN 978-0-7381-5801-3 STD95821 STDPD95821 ISBN 978-0-7381-6853-1 ISBN 978-0-7381-6854-8 STD95821 STDPD95821 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. Authorized licensed use limited to: Gonzaga University. Downloaded on April 26,2014 at 16:54:29 UTC from IEEE Xplore. Restrictions apply.

IEEE Standards documents are developed within the IEEE Societies and the Standards Coordinating Committees of the IEEE Standards Association (IEEE-SA) Standards Board. The IEEE develops its standards through a consensus development process, approved by the American National Standards Institute, which brings together volunteers representing varied viewpoints and interests to achieve the final product. Volunteers are not necessarily members of the Institute and serve without compensation. While the IEEE administers the process and establishes rules to promote fairness in the consensus development process, the IEEE does not independently evaluate, test, or verify the accuracy of any of the information or the soundness of any judgments contained in its standards. Use of an IEEE Standard is wholly voluntary. The IEEE disclaims liability for any personal injury, property or other damage, of any nature whatsoever, whether special, indirect, consequential, or compensatory, directly or indirectly resulting from the publication, use of, or reliance upon this, or any other IEEE Standard document. The IEEE does not warrant or represent the accuracy or content of the material contained herein, and expressly disclaims any express or implied warranty, including any implied warranty of merchantability or fitness for a specific purpose, or that the use of the material contained herein is free from patent infringement. IEEE Standards documents are supplied “AS IS.” The existence of an IEEE Standard does not imply that there are no other ways to produce, test, measure, purchase, market, or provide other goods and services related to the scope of the IEEE Standard. Furthermore, the viewpoint expressed at the time a standard is approved and issued is subject to change brought about through developments in the state of the art and comments received from users of the standard. Every IEEE Standard is subjected to review at least every five years for revision or reaffirmation. When a document is more than five years old and has not been reaffirmed, it is reasonable to conclude that its contents, although still of some value, do not wholly reflect the present state of the art. Users are cautioned to check to determine that they have the latest edition of any IEEE Standard. In publishing and making this document available, the IEEE is not suggesting or rendering professional or other services for, or on behalf of, any person or entity. Nor is the IEEE undertaking to perform any duty owed by any other person or entity to another. Any person utilizing this, and any other IEEE Standards document, should rely upon his or her independent judgment in the exercise of reasonable care in any given circumstances or, as appropriate, seek the advice of a competent professional in determining the appropriateness of a given IEEE standard. Interpretations: Occasionally questions may arise regarding the meaning of portions of standards as they relate to specific applications. When the need for interpretations is brought to the attention of IEEE, the Institute will initiate action to prepare appropriate responses. Since IEEE Standards represent a consensus of concerned interests, it is important to ensure that any interpretation has also received the concurrence of a balance of interests. For this reason, IEEE and the members of its societies and Standards Coordinating Committees are not able to provide an instant response to interpretation requests except in those cases where the matter has previously received formal consideration. At lectures, symposia, seminars, or educational courses, an individual presenting information on IEEE standards shall make it clear that his or her views should be considered the personal views of that individual rather than the formal position, explanation, or interpretation of the IEEE. Comments for revision of IEEE Standards are welcome from any interested party, regardless of membership affiliation with IEEE. Suggestions for changes in documents should be in the form of a proposed change of text, together with appropriate supporting comments. Comments on standards and requests for interpretations should be addressed to: Secretary, IEEE-SA Standards Board 445 Hoes Lane Piscataway, NJ 08854 USA Authorization to photocopy portions of any individual standard for internal or personal use is granted by the Institute of Electrical and Electronics Engineers, Inc., provided that the appropriate fee is paid to Copyright Clearance Center. To arrange for payment of licensing fee, please contact Copyright Clearance Center, Customer Service, 222 Rosewood Drive, Danvers, MA 01923 USA; +1 978 750 8400. Permission to photocopy portions of any individual standard for educational classroom use can also be obtained through the Copyright Clearance Center. Authorized licensed use limited to: Gonzaga University. Downloaded on April 26,2014 at 16:54:29 UTC from IEEE Xplore. Restrictions apply.

Introduction This introduction is not part of IEEE Std 1076-2008, IEEE Standard VHDL Language Reference Manual. The VHSIC 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, verification, synthesis, and testing of hardware designs; the communication of hardware design data; and the maintenance, modification, and procurement of hardware. This document, IEEE Std 1076-2008, is a revision of IEEE Std 1076-2002 as amended by 1076cTM-2007. Initial work on gathering requirements and developing language extensions IEEE Std was undertaken by the IEEE VHDL Analysis and Standardization Group (VASG), otherwise known as the 1076 Working Group. Subsequently, Accelleraa sponsored an effort to complete that work and draft a revised Language Reference Manual. That draft was returned to IEEE for final revision and approval, resulting in this document and the associated machine-readable files. This revision incorporates numerous enhancements, both major and minor, to previously existing language feaures and several new language features. The changes are summarized in Annex E. In addition, several VHDL library packages that were previously defined in separate standards are now defined in this standard, ensuring that they are treated as integral parts of the language. Finally, this revision incorporates the IEEE Property Specification Language (PSL) as part of VHDL. The combination of these changes significantly improves VHDL as a language for specification, design, and verification of complex electronic systems. The maintenance of the VHDL language standard is an ongoing process. The chair of the VHDL Analysis and Standardization Group extends his gratitude to all who have participated in this revision, both in the IEEE committees and the Accellera effort, and encourages the participation of all interested parties in future language revisions.b Notice to users Laws and regulations Users of these documents should consult all applicable laws and regulations. Compliance with the provisions of this standard does not imply compliance to any applicable regulatory requirements. Implementers of the standard are responsible for observing or referring to the applicable regulatory requirements. IEEE does not, by the publication of its standards, intend to urge action that is not in compliance with applicable laws, and these documents may not be construed as doing so. Copyrights This document is copyrighted by the IEEE. It is made available for a wide variety of both public and private uses. These include both use, by reference, in laws and regulations, and use in private self-regulation, standardization, and the promotion of engineering practices and methods. By making this document available for use and adoption by public authorities and private users, the IEEE does not waive any rights in copyright to this document. aMore information is available at www.accellera.org. bIf interested in participating, please contact the VASG at stds-vasg@ieee.org or visit: http://www.eda.org/vasg. iv Copyright © 2009 IEEE. All rights reserved. Authorized licensed use limited to: Gonzaga University. Downloaded on April 26,2014 at 16:54:29 UTC from IEEE Xplore. Restrictions apply.

Updating of IEEE documents Users of IEEE standards should be aware that these documents may be superseded at any time by the issuance of new editions or may be amended from time to time through the issuance of amendments, corrigenda, or errata. An official IEEE document at any point in time consists of the current edition of the document together with any amendments, corrigenda, or errata then in effect. In order to determine whether a given document is the current edition and whether it has been amended through the issuance of amendments, corrigenda, or errata, visit the IEEE Standards Association website at http:// ieeexplore.ieee.org/xpl/standards.jsp, or contact the IEEE at the address listed previously. For more information about the IEEE Standards Association or the IEEE standards development process, visit the IEEE-SA website at http://standards.ieee.org. Errata Errata, if any, for this and all other standards can be accessed at the following URL: http:// standards.ieee.org/reading/ieee/updates/errata/index.html. Users are encouraged to check this URL for errata periodically. Interpretations Current interpretations can be accessed at the following URL: http://standards.ieee.org/reading/ieee/interp/ index.html. Patents Attention is called to the possibility that implementation of this standard may require use of subject matter covered by patent rights. By publication of this standard, no position is taken with respect to the existence or validity of any patent rights in connection therewith. The IEEE shall not be responsible for identifying patents or patent applications for which a license may be required to implement an IEEE standard or for conducting inquiries into the legal validity or scope of those patents that are brought to its attention. Participants At the time this standard was submitted to the IEEE-SA Standards Board for approval, the 1076 Working Group had the following membership: Jim Lewis, Chair Chuck Swart, Vice Chair Peter Ashenden, Secretary and Technical Editor John Aynsley Stephen Bailey Victor Berman Patrick Bryant Roland R. Henrie Daniel Kho Françoise Martinolle Egert Molenkamp Robert Myers Farrell Ostler John Ries Timothy Schneider Sukrit Shankar John Shields Alain Vachoux Ajayharsh Varikat Richard Wallace John Willis Alex Zamfirescu Mark Zwolinski Copyright © 2009 IEEE. All rights reserved. v Authorized licensed use limited to: Gonzaga University. Downloaded on April 26,2014 at 16:54:29 UTC from IEEE Xplore. Restrictions apply.

The following members of the individual balloting committee voted on this standard. Balloters may have voted for approval, disapproval, or abstention. Peter Ashenden Bakul Banerjee Victor Berman Martin J. Bishop Lyle Bullock James Case Keith Chow Ernst Christen S. Claassen Kevin Coggins Joanne Degroat Thomas Dineen Steven Dovich George Economakos Charles Gardiner Sergiu Goma Randall Groves William Hanna M. Hashmi Werner Hoelzl Joseph Hupcey Piotr Karocki Kurt Kermes Jim Lewis G. Luri Timothy McBrayer Donald Mills Egbert Molenkamp Robert Myers Prajit Nair Z. Navabi Michael S. Newman Ulrich Pohl Bartien Sayogo Timothy Schneider Stephen Schwarm John Sheppard John Shields David Smith Walter Struppler Chuck Swart Lance Thompson Yatin Trivedi Alain Vachoux Ajayharsh Varikat Srinivasa Vemuru Kathy Werner John Willis Paul Work Mark Zwolinski When the IEEE-SA Standards Board approved this standard on 26 September 2008, it had the following membership: Robert M. Grow, Chair Thomas Prevost, Vice Chair Steve M. Mills, Past Chair Judith Gorman, Secretary Victor Berman Richard DeBlasio Andy Drozd Mark Epstein Alexander Gelman William R. Goldbach Arnold M. Greenspan Kenneth S. Hanus *Member Emeritus Jim Hughes Richard H. Hulett Young Kyun Kim Joseph L. Koepfinger* John Kulick David J. Law Glenn Parsons Ronald C. Petersen Chuck Powers Narayanan Ramachandran Jon Walter Rosdahl Robby Robson Anne-Marie Sahazizian Malcolm V. Thaden Howard L. Wolfman Don Wright Also included are the following nonvoting IEEE-SA Standards Board liaisons: Satish K. Aggarwal, NRC Representative Michael Janezic, NIST Representative IEEE Standards Program Manager, Document Development Jennie Steinhagen IEEE Standards Program Manager, Technical Program Development Michael D. Kipness vi Copyright © 2009 IEEE. All rights reserved. Authorized licensed use limited to: Gonzaga University. Downloaded on April 26,2014 at 16:54:29 UTC from IEEE Xplore. Restrictions apply.

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