Department of Communication Engineering, NCTU

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Presentation transcript:

Department of Communication Engineering, NCTU Unit 1 Introduction Department of Communication Engineering, NCTU

Department of Communication Engineering, NCTU What are digital circuits and systems? Any system that can be implemented with digital circuits What kinds of systems can be implemented with digital circuits? This depends on the complexity of the problem to be solved For those who has complexity proportional to polynomial functions, they are generally solvable with digital systems E.g. The inversion of a N  N matrix What are they? IEEE Trans. on Circuits and Systems Department of Communication Engineering, NCTU

Department of Communication Engineering, NCTU What is a digital system? A system that implements functions using digital logics Department of Communication Engineering, NCTU

Department of Communication Engineering, NCTU Even a power plant control system is a digital system Department of Communication Engineering, NCTU

Department of Communication Engineering, NCTU What are the constitutional blocks of a digital system? It has input interfaces Key boards, antennas, wire jackets, sensors and microphones It also has output interferences Monitors, speakers, motors, printers, antennas, wire jackets and actuators It definitely has signal processing units, or, in other words, arithmetic and logic units Department of Communication Engineering, NCTU

Department of Communication Engineering, NCTU How to develop a digital system? First, it is not only designing a digital circuit A digital circuit is designed to realize functions that serve systems’ requirements A system may involves knowledge of control theories, communications, biology, mechanics, chemistries and etc. Digital circuits can be categorized into General purpose circuits Computers, Digital signal processors Application specific circuits Modems, GPS, cellphones Department of Communication Engineering, NCTU

Department of Communication Engineering, NCTU How to develop a digital circuit? We need knowledge about digital logic We need tools to explore the ideas, to simulations the operational conditions, to realize circuits and to validate functionalities We need platforms to field test, emulate, the designs Do we have a language that can specify these purposes? This language is called hardware description language (HDL), e.g. VHDL and Verilog HDL In addition to language, we need translators, simulators, synthesizers and hardware evaluation and development systems Department of Communication Engineering, NCTU

Department of Communication Engineering, NCTU Translators : To compile VHDL or Verilog HDL languages into a language that can be understand by a computer Simulators: To simulate the system response according to input signals Synthesizers: To synthesize VHDL or Verilog language into digital circuits Validations: Digital circuit development systems Department of Communication Engineering, NCTU

Department of Communication Engineering, NCTU Digital circuits developments There are many of them Stratix EP1S25 DSP Development Board Data Sheet Stratix EP1S25 DSP Development Board User Guide Department of Communication Engineering, NCTU

Department of Communication Engineering, NCTU What we are going to learn? Design a general purpose logic circuit Design a application specific logic circuit Systematic ways of designing digital systems More advanced topics in logic designs Modeling logic problems with HDLs Simulating logic functions Synthesizing logic circuits with HDLs Validating designs with programmable logic devices on a hardware development system The concept of a digital system Department of Communication Engineering, NCTU