 # A Programmable Logic Device Lecture 4.3. A Programmable Logic Device Multiple-input Gates A 2-Input, 1-Output PLD.

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A Programmable Logic Device Lecture 4.3

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

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

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

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

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

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

A Programmable Logic Device

A = X & !X & Y & !Y = 0 & 0 = 0

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

A PLD AND Gate

A PLD OR Gate

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

A PLD XOR Gate

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

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

Lab 2 – Structure of a PLD

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