ECE 2110: Introduction to Digital Systems

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ECE 2110 Introduction to Digital Systems

• Introduction (Contd.)

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Previous class Summary

• Digital devices
• Digital vs. analog
• Why digital

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Digital Logic

• Binary system -- 0 1, LOW HIGH, negated and
  asserted.
• Basic building blocks -- AND, OR, NOT

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(No Transcript)
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Electronic aspect of digital design
Digital abstraction Range Noise margin Invalid
range Specifications
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Software aspect of digital design

• Digital design need not involve any software
  tools.
• But modern design, software tools are essential.
• Examples
• Schematic entry, HDLs (platform compilers,
  simulators, synthesis tools), simulators, test
  benches, timing analyzers and verifiers, word
  processors, high-level languages, CAD

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Integrated Circuits (IC)

• A collection of one or more gates fabricated on a
  single silicon chip.
• Wafer, die
• Small-scale integration (SSI) 1-20
• DIP dual in-line-pin package
• Pin diagram, pinout
• MSI 20-200 gates
• LSI 200-200,000
• VLSI gt100,000, 50million (1999)

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DIP
pinout
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Programmable Logic Device (PLD)

• ICs which Logic function can be programmed after
  manufacturing.
• 2-level AND-OR gates using user-programmable
  connections
• PLAs programmable Logic Arrarys.
• PALs programmable array logic devices
• Programmable logic devices (PLDs)
• CPLD complex PLD
• FPGA Field-Programmable Gate Array

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CPLD vs FPGA
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Application-Specific ICs (ASIC)

• Semi-custom IC chips designed for a particular,
  limited product/application
• Reducing chip count, size, power consumption
• Higher performance.
• NRE nonrecurring engineering cost
• Standard cells library
• Gate array an IC with internal structure as an
  array of gates, unspecified interconnection

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Printed-Circuit Board

• PCB or PWB (printed-wiring board)
• Mount ICs so that an IC can connect to other ICs
  in a system.
• SMT Surface-mount technology
• MCM multi-chip modules high speed and density.

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Summary

• Electronics aspects of digital design
• Integrated Circuits
• (wafer, die, SSI, MSI, LSI, VLSI)
• PLDs PLAs, PALs, CPLD, FPGA
• ASIC

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Next

• Number systems
• Reading Wakerly chapter 2