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4.2
Gates
93
Figure 4.3
Various representations of an OR gate
Logic Diagram Symbol
Boolean Expression
Truth Table
1 0 – 8 7
AB
0
0
1
1
0
1
0
1
X
0
1
1
1
A
B
X
Figure 4.4
Various representations of an XOR gate
Logic Diagram Symbol
Boolean Expression
Truth Table
1 0 –
⊕
7
0
0
1
1
0
1
0
1
X
0
1
1
0
A
B
X
XOR Gate
The XOR, or
exclusive
OR, gate is shown in Figure 4.4. An XOR gate
produces 0 if its two inputs are the same, and a 1 otherwise. Note the
difference between the XOR gate and the OR gate; they differ only in one
input situation. When both input signals are 1, the OR gate produces a 1
and the XOR produces a 0.
Sometimes the regular OR gate is referred to as the
inclusive
OR,
because it produces a 1 if either or both of its inputs is a 1. The XOR
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This note was uploaded on 01/13/2011 for the course CSE 1550 taught by Professor Marianakant during the Fall '10 term at York University.
 Fall '10
 MARIANAKANT

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