The definitive reference for VHDL is the VHDL
language reference manual
), currently IEEE Std
References here such as [93LRM 1.1], for example, refer to Section 1.1 of the VHDL-93 LRM
[IEEE 1076-1993]. According to IEEE bylaws all standards are updated (reaffirmed, reballoted, or dropped) every five years, and thus VHDL-87 (the original standard) is superceded by VHDL-93. However, some software systems (and some IEEE standards, notably VITAL) are based on VHDL-87
[IEEE 1076-1987]. Both VHDL-93 and VHDL-87 are covered in this Appendix.
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