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ECE 2110: Introduction to Digital Systems

ECE 2110: Introduction to Digital Systems. Introduction (Contd.). Previous class Summary. Digital devices Digital vs. analog Why digital. Digital Devices. Gates: AND, OR, NOT (inverter): most important gates. Can realize any digital function. NAND, NOR… Flip-flops:

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ECE 2110: Introduction to Digital Systems

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  1. ECE 2110: Introduction to Digital Systems Introduction (Contd.)

  2. Previous class Summary • Digital devices • Digital vs. analog • Why digital

  3. Digital Devices • Gates: • AND, OR, NOT (inverter): most important gates. Can realize any digital function. • NAND, NOR… • Flip-flops: • Stores 0/1, built from gates • Gates: Combinational circuit: output depends only on the current input combination. • Flip-flops: Sequential circuit: output depends on current input as well as past inputs. Has memory of past events. ECE 2110: Introduction to Digital systems

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

  5. Electronic aspect of digital design Digital abstraction Range Noise margin Invalid range Specifications

  6. 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

  7. Integrated Circuits (IC) (Chapter 1.6--1.12) • A collection of one or more gates fabricated on a single silicon chip. • Wafer, die • Small-scale integration (SSI): 1-20 gates • DIP: dual in-line-pin package • Pin diagram, pinout • MSI: 20-200 gates • LSI: 200-1,000,000 • VLSI: Fuzzy! Transistor count reached 50million in 1999 and 100 million in 2005.

  8. DIP pinout

  9. 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.

  10. Summary • Electronics aspects of digital design • Integrated Circuits SSI, MSI, LSI, VLSI • Printed Circuit Boards

  11. Next… • HW: Work Wakerly problems 1.3,1.6 • Finish reading Chapter 1, • You may use www.acronymfinder.com for homework #1 (but make sure that definitions are consistent with the text) • Number systems • Start Reading: Wakerly chapter 2

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