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====Revisions==== * IEEE 1076β1987<ref name="originalversion" /> First standardized revision of ver 7.2 of the language from the United States Air Force. * IEEE 1076β1993<ref>{{Cite book |title = 1076-1993 β 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 1076β2000.<ref>{{Cite book |title = 1076-2000 β 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 1076β2002.<ref>{{Cite book |title = 1076-2002 β IEEE Standard VHDL Language Reference Manual |doi = 10.1109/IEEESTD.2002.93614 |year = 2002 |isbn = 0-7381-3247-0}}</ref> Minor revision of 1076β2000. 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 β IEC/IEEE Behavioural Languages β 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 1076β2002. * IEEE 1076cβ2007.<ref>{{Cite book |title = 1076c-2007 β 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 1076β2008 (previously referred to as 1076β200x). 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 β Behavioural languages β Part 1-1: VHDL Language Reference Manual |year = 2011 |isbn = 978-0-7381-6605-6}}</ref> IEC adoption of IEEE 1076β2008. * IEEE 1076β2019. Major revision.
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