TAILIEUCHUNG - Digital Circuits

Our world is an analog world. Measurements that we make of the physical objects around us are never in discrete units, but rather in a continuous range. | Chapter 2 - Digital Circuits Page 1 of 32 Contents Digital Binary Binary Basic Logic Operators and Logic Truth Boolean Algebra and Boolean Boolean Duality Boolean Function and the Minterms and Maxterms . 15 Canonical Standard and non-Standard Logic Gates and Circuit Example Designing a Car Security VHDL for Digital VHDL code for a 2-input NAND VHDL code for a 3-input NOR VHDL code for a Summary Index . 31 Digital Logic and Microprocessor Design with VHDL Last updated 6 16 2004 5 24 PM Chapter 2 - Digital Circuits Page 2 of 32 Chapter 2 Digital Circuits Control Inputs Data Inputs Control unit J rr L -ELJ- State Next- Memory state Logic register Output Logic K. . y P K. P Control Signals P K. I P register ALU 1 0 I Datapath _ 8 Status Signals 8 Control Outputs Data Outputs Digital Logic and Microprocessor Design with VHDL Last updated 6 16 2004 5 24 PM Chapter 2 - Digital Circuits Page 3 of 32 Our world is an analog world. Measurements that we make of the physical objects around us are never in discrete units but rather in a continuous range. We talk about physical constants such as . or . To build analog devices that can process these values accurately is next to impossible. Even building a simple analog radio requires very accurate adjustments of frequencies voltages and currents at each part of the circuit. If we were to use voltages to represent the constant we would have to build a component that will give us exactly volts every time. This is again impossible due to the imperfect manufacturing process each component produced is slightly different from the others. Even if the manufacturing process can be made as perfect

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