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education/computer engineering/ECE2700/Binary Logic.md

@@ -63,5 +63,21 @@ A NOR gate outputs a one if neither gate is enabled.
 | 1     | 0     | 0     |
 | 1     | 1     | 0     |
 ## Mathematical Expression
+A NOR operation is expressed using a bar over an OR operation.
+$$ y = \overline{x_1 + x_2} $$
+# XOR Gate
+An XOR gate is on if one input is enabled, but *not* both (exclusively one or the other).
 
-$$ y = \overline{x_1 + x_2} $$
+## Truth Table
+| $x_1$ | $x_2$ | $y$ |
+| ----- | ----- | --- |
+| 0     | 0     | 0   |
+| 0     | 1     | 1   |
+| 1     | 0     | 1   |
+| 1     | 1     | 0   |
+## Mathematical Expression
+An XOR operation is expressed using a circle around an addition symbol:
+$$ y = x_1 \oplus x_2 $$
+
+## XNOR Gate
+An XNOR gate is on