VHDL arose out of the United States government's Very High Speed Integrated Circuits (VHSIC/ program. In the course of this program, it became clear that there was a need for a standard language for describing the structure and function of integrated circuits (ICs). Hence the VHSIC Hardware Description Language (VHDL) was developed. It was subsequently developed further under the auspices of the Institute of Electrical and Electronic Engineers (IEEE) and adopted in the form of the IEEE Standard 1076, Standard VHDL Language Reference Manual, in 1987. This first standard version of the language is often referred to as VHDL-87.

Like all IEEE standards, the VHDL standard is subject to review at least every five years. Comments and suggestions from users of the 1987 standard were analyzed by the IEEE working group responsible for VHDL, and in 1992 a revised version of the standard was proposed. This was eventually adopted in 1993, giving us VHDL-93. A further round of revision of the standard was started in 1998. That process was com

pleted in 2001. In 2002,the current VHDL standard (IEEE-1076-2002)was adopted

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