Editing VHDL (section)

===Standardization===
The [[IEEE]] Standard 1076 defines the [[VHSIC]] [[Hardware Description Language]], or VHDL. It was originally developed under contract F33615-83-C-1003 from the [[United States Air Force]] awarded in 1983 to a team of Intermetrics, Inc. as language experts and prime contractor, [[Texas Instruments]] as chip design experts and [[IBM]] as computer-system design experts. The language has undergone numerous revisions and has a variety of sub-standards associated with it that augment or extend it in important ways.

IEEE Standard 1076 was and continues to be a milestone in the design of electronic systems.<ref>[https://ieee-p1076.gitlab.io/ IEEE P1076 Working Group VHDL Analysis and Standardization Group (VASG)]</ref>

====Revisions====
* IEEE 1076–1987<ref name="originalversion" /> First standardized revision of ver 7.2 of the language from the United States Air Force.
* IEEE 1076–1993<ref>{{Cite book |title = 1076-1993 – IEEE Standard VHDL Language Reference Manual |doi = 10.1109/IEEESTD.1994.121433 |year = 1994 |isbn = 0-7381-0986-X}}</ref> (also published with {{ISBN|1-55937-376-8}}). Significant improvements resulting from several years of feedback. Probably the most widely used version with the greatest vendor tool support.
* IEEE 1076–2000.<ref>{{Cite book |title = 1076-2000 – IEEE Standard VHDL Language Reference Manual |doi = 10.1109/IEEESTD.2000.92297 |year = 2000 |isbn = 0-7381-1948-2}}</ref> Minor revision. Introduces the use of ''protected types''.
* IEEE 1076–2002.<ref>{{Cite book |title = 1076-2002 – IEEE Standard VHDL Language Reference Manual |doi = 10.1109/IEEESTD.2002.93614 |year = 2002 |isbn = 0-7381-3247-0}}</ref> Minor revision of 1076–2000. Rules with regard to ''buffer ports'' are relaxed.
** IEC 61691-1-1:2004.<ref>{{Cite book |doi = 10.1109/IEEESTD.2004.95752 |title = IEC 61691-1-1 First edition 2004-10; IEEE 1076 — IEC/IEEE Behavioural Languages – Part 1-1: VHDL Language Reference Manual (Adoption of IEEE Std 1076-2002) |year = 2004 |isbn = 2-8318-7691-5}}</ref> IEC adoption of IEEE 1076–2002.
* IEEE 1076c–2007.<ref>{{Cite book |title = 1076c-2007 – IEEE Standard VHDL Language Reference Manual Amendment 1: Procedural Language Application Interface |doi = 10.1109/IEEESTD.2007.4299594 |year = 2007 |isbn = 978-0-7381-5523-4}}</ref> Introduced VHPI, the VHDL procedural interface, which  provides software with the means to access the VHDL model. The VHDL language required minor modifications to accommodate the VHPI.
* IEEE 1076–2008 (previously referred to as 1076–200x). Major revision released on 2009-01-26. Among other changes, this standard incorporates a basic subset of PSL, allows for generics on packages and subprograms and introduces the use of ''external names''.
** IEC 61691-1-1:2011.<ref>{{Cite book |doi = 10.1109/IEEESTD.2011.5967868 |title = 61691-1-1-2011 — Behavioural languages – Part 1-1: VHDL Language Reference Manual |year = 2011 |isbn = 978-0-7381-6605-6}}</ref> IEC adoption of IEEE 1076–2008.
* IEEE 1076–2019. Major revision.

====Related standards====
* IEEE 1076.1 VHDL Analog and Mixed-Signal ([[VHDL-AMS]])
* IEEE 1076.1.1 VHDL-AMS Standard Packages (stdpkgs)
* IEEE 1076.2 VHDL Math Package
* IEEE 1076.3 VHDL Synthesis Package (vhdlsynth) ([[numeric std]])
* IEEE 1076.3 VHDL Synthesis Package – Floating Point (fphdl)
* IEEE 1076.4 Timing (VHDL Initiative Towards ASIC Libraries: vital)
* IEEE 1076.6 VHDL Synthesis Interoperability (withdrawn in 2010)<ref>{{Cite web|url=https://standards.ieee.org/ieee/1076.6/3466/|title = IEEE 1076.6-2004 - IEEE Standard for VHDL Register Transfer Level (RTL) Synthesis}}</ref>
* [[IEEE 1164]] VHDL Multivalue Logic (std_logic_1164) Packages