VHDL From Ch. 5 Hardware Description Languages. History 1980’s Schematics 1990’s Hardware Description Languages –Increased due to the use of Programming.

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Presentation transcript:

VHDL From Ch. 5 Hardware Description Languages

History 1980’s Schematics 1990’s Hardware Description Languages –Increased due to the use of Programming Logic Devices (PLDs), Complex PLDs (CPLDs), and Field Programmable Gate Arrays (FPGAs) Today: Very High Speed IC (VHSIC) Hardware Description Language (VHDL) and Verilog

HDL Tools Design Tools –Text Editor –Compiler—Syntax can be checked Simulator –A timed sequence of inputs (a test-bench program) for the hardware is used to test the design. Synthesizer –Applies the design to a hardware technology (such as CPLDs).

VHDL Program Structure –Entity A declaration of the inputs and outputs. –Architecture A description of the internal behavior or structure. Templates –Tools can provide basic structure. –Example: Xilinx Design Suite