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IEEE Standard VHDL Language Reference Manual (IEEE Std 1076™-2008)

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标签: VHDL

VHDL

IEEE  Standard  VHDL  Language  Reference  Manual  (IEEE  Std  1076™-2008)

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.

IEEE Standard VHDL Language
Reference Manual
IEEE Computer Society
Sponsored by the
Design Automation Standards Committee
1076
TM
IEEE
3 Park Avenue
New York, NY 10016-5997, USA
26 January 2009
IEEE Std 1076™-2008
(Revision of
IEEE Std 1076-2002)
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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
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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.
PDF:
CD-ROM:
ISBN 978-0-7381-5800-6
ISBN 978-0-7381-5801-3
STD95821
STDCD95821
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.
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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
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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
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IS.”
The existence of an IEEE Standard does not imply that there are no other ways to produce, test, measure, purchase,
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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
IEEE Std 1076c
TM
-2007. Initial work on gathering requirements and developing language extensions
was undertaken by the IEEE VHDL Analysis and Standardization Group (VASG), otherwise known as the
1076 Working Group. Subsequently, Accellera
a
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.
a
b
More information is available at www.accellera.org.
If 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.
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