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IEEE Std 1076™-2008
(Revision of
IEEE Std 1076-2002)
IEEE Standard VHDL Language
Reference Manual
IEEE
3 Park Avenue
New York, NY 10016-5997, USA
26 January 2009
IEEE Computer Society
Sponsored by the
Design Automation Standards Committee
1076
TM
Authorized licensed use limited to: CALIFORNIA INSTITUTE OF TECHNOLOGY. Downloaded on February 27,2018 at 15:49:58 UTC from IEEE Xplore. Restrictions apply.

Authorized licensed use limited to: CALIFORNIA INSTITUTE OF TECHNOLOGY. Downloaded on February 27,2018 at 15:49:58 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: CALIFORNIA INSTITUTE OF TECHNOLOGY. Downloaded on February 27,2018 at 15:49:58 UTC from IEEE Xplore. Restrictions apply.

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.
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2nd Printing 29 July 2011. The following ISBNs were incorrect in the 1st Printing of 26 January 2009.
PDF: ISBN 978-0-7381-5800-6 STD95821
Print: ISBN 978-0-7381-5801-3 STDPD95821
The correct ISBNs are:
PDF: ISBN 978-0-7381-6853-1 STD95821
Print: ISBN 978-0-7381-6854-8 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.
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
Authorized licensed use limited to: CALIFORNIA INSTITUTE OF TECHNOLOGY. Downloaded on February 27,2018 at 15:49:58 UTC from IEEE Xplore. Restrictions apply.

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