IEEE-1076: Standard VHDL Language Reference Manual IEEE Computer Society Document
IEEE 1076.1: VHDL Analog and Mixed-Signal Extensions IEEE Computer Society Document
IEEE 1076.2: Standard VHDL Mathematical Packages IEEE Computer Society Document
IEEE 1076.3: Standard VHDL Synthesis Packages IEEE Computer Society Document
IEEE 1076.4: Standard for VITAL ASIC (Application Specific Integrated Circuit) Modeling Specification IEEE Computer Society Document
IEEE 1076.6: Standard for VHDL Register Transfer Level (RTL) Synthesis IEEE Computer Society Document

VHDL Reference Sites;
comp.lang.vhdl {FAQ} {Edwin Naroska, dated 2004}

VHDL and Verilog Info {VHDL International}

Note; most news-group FAQ pages stopped being up-dated as the internet became more popular.

MIL-HDBK-62: - Documentation of Digital Electronic Systems with VHDL

Pages on this site:
VHDL code examples: VHDL Coded Circuits [A short list]
VHDL code pitfalls: VHDL Coded Circuits to Avoid [Another short list]
VHDL Design Tools: CAD - CAE Products
VHDL Simulation Tools: Simulation Software Products
FPGA Manufactures: Hardware/Components/Semiconductor/Digital/Programmable Logic
Terms: Programmable Logic Definitions

This is a General listing of VHDL Related sites; FAQ's, Guides, Tutorials, Design Examples, Resources, and FPGA Component links.
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