CAST, Inc. - An intellectual property provider that develops and supports synthesizable cores and simulation models for electronic design using VHDL. Alternative System Concepts, Inc. - On-Line Documentation. Doctor VHDL Design Services and Training - VHDL and ASIC / FPGA training courses as well as design services. Hello, World Program - Written in VHDL. VHDL Designer's Guide - What is VHDL? A Brief History of VHDL. Tutorial. Doulos KnowHow - VHDL Models - Generic Large-capacity RAM Model, Analog-to-Digital Converter Model, Finite Impulse Response (FIR) Filter, Image Processing Cache Register Array (IPCRA), Carry Look Ahead Blocks, Synchronizer Scaler, Heap Sort Parallel, Simple RAM Model, Spectrum Spreader, 32-bit Demultiplexer, 6-port Register File, BIST Circuits models. VHDL Verification Course - Introduction to VHDL verification techniques. It assumes some familiarity with VHDL. CQPIC - Support page for a free synthesizable VHDL/Verilog description of Microchip's PIC16F84(A) processor. Hamburg VHDL Archive - Home of open source designs in VHDL, as well as tools and documentation, maintained by the TAMS Group, Faculty of Informatics, University of Hamburg.