Defines and increases the VHDL language reference manual (LRM) by including a standard C language interface specification; specifications from previously separate, but related, standards IEEE Std 1164[TM]-1993 [B16], IEEE Std 1076.2[TM]-1996 [B11], and IEEE Std 1076.3[TM]-1997 [B12]; and general language enhancements in the areas of design and verification of electronic systems.