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Understanding Multiple-Input Gates in Programmable Logic Devices

This lecture delves into the fundamentals of multiple-input gates within Programmable Logic Devices (PLDs). It covers the behavior of essential gates such as AND, OR, NAND, and NOR, explaining their outputs based on various input combinations. Key concepts such as the significance of high and low outputs, as well as specific PLD designs like XOR gates, are discussed. Additionally, the lecture explores practical applications and design techniques with the goal of enhancing understanding of digital logic principles in PLD implementations.

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Understanding Multiple-Input Gates in Programmable Logic Devices

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  1. A Programmable Logic Device Lecture 4.3

  2. A Programmable Logic Device • Multiple-input Gates • A 2-Input, 1-Output PLD

  3. Multiple-input Gates Z Z 2 1 Z Z 4 3

  4. Multiple-input AND Gate Z 1 Output is HIGH only if all inputs are HIGH Z 1 An open input will float HIGH

  5. Multiple-input OR Gate Z 2 Output is LOW only if all inputs are LOW Z 2

  6. Multiple-input NAND Gate Z 3 Output is LOW only if all inputs are HIGH Z 3

  7. Multiple-input NOR Gate Z 4 Output is HIGH only if all inputs are LOW Z 4

  8. A Programmable Logic Device

  9. A Programmable Logic Device A = X & !X & Y & !Y = 0 & 0 = 0

  10. A Programmable Logic Device A = X & !X & Y & !Y = 0 & 0 = 0 Z = A # B = 0 # B = B

  11. A PLD AND Gate

  12. A PLD OR Gate

  13. Sum of Products Design Design an XOR gate X Y Z 0 0 0 0 1 1 1 0 1 1 1 0 m1 = !X & Y m2 = X & !Y Z = m1 # m2 = (!X & Y) # (X & !Y)

  14. A PLD XOR Gate

  15. What type of gate is this? X Y removable jumpers A 1 Z 2 B X !X Y !Y

  16. What type of gate is this? X Y removable jumpers A 1 Z 2 B X !X Y !Y

  17. Lab 2 – Structure of a PLD

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