PPT Slide

1 – Introduction

© 1996 Gaetano Borriello

What is digital hardware?

• Collection of devices that sense and/or control wires that carry a digital value (i.e., a physical quantity that can be interpreted as a "0" or "1")

  • example: digital logic where voltage < .5v is a "0" and > 2.4v is a "1"
  • example: pair of transmission wires where a "0" or "1" is distinguished by which wire has a higher voltage (differential)

• Primitive digital hardware devices

  • logic computation devices (sense and drive)
    • are two wires both "1" - make another be "1" (AND)
    • is at least one of two wires "1" - make another be "1" (OR)
    • is a wire "1" - then make another be "0" (NOT)
  • memory devices (store)
    • store a value
    • recall a value previously stored

3

sense

sense

drive

AND

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