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Note for Digital System Design - DSD by Agi Joseph George

  • Digital System Design - DSD
  • Note
  • APJ Abdul Kalam Technological University - KTU
  • Electronics and Communication Engineering
  • B.Tech
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CPLD and FPGA (Refer: Digital Design - John F Wakerley {pages 898 – 916}) - Agi Joseph George, AP / ECE / AJCE 1

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Introduction: • In the world of digital electronic systems, there are 3 basic kinds of devices: • Memory, microprocessor, logic devices • Memory devices store random information such as the contents of a spreadsheet or database. • Microprocessors execute software instructions to perform a wide variety of tasks such as running a word processing Program or video game. • Logic devices provide specific functions, including • • • • • • device-to-device interfacing, data communication, signal processing, data display, timing and control operations, and almost every other function a system must perform. 2

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Logic Devices: • A logic device is one which can perform any logic function • Logic devices are broadly classified in to two categories: • Fixed and • Programmable. • As the name suggests, the circuits in a fixed logic device are permanent, they perform one function or set of functions – once manufactured, they cannot be changed. • On the other hand, programmable devices are standard and offers a wide range of logic features and voltage characteristics - and these devices can be changed at any time to perform various logic functions. 3

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Programmable Logic Devices (PLDs): • A programmable logic device is an integrated circuit with internal logic gates and interconnects. • These gates can be connected to obtain the required logic Configuration. • The term Programmable means changing either hardware or software configuration of an internal logic and interconnects. • Of course the configuration of the internal logic is done by the user. • PROM,EPROM,PAL,GAL etc.. are few examples of programmable logic devices. 4

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