What is xor and xnor

More succinctly, inverting an odd number of inputs changes an XOR to an XNOR and vice-versa, inverting an even number of inputs changes nothing, and inverting the entire function has the same effect as inverting a single input. Some representative cases are shown.

This very useful property will be exploited in data error detection circuits discussed later. CMOS circuits for either function can be can built from just 6 transistors, but those circuits have some undesirable features. When control is a '1' the input A is inverted, but when control is a '0' A is simply passed through the logic gate without modification. This controlled inversion function will be useful in later work. Toggle Navigation. The multi-bit versions of each gate will perform its one-bit transformation bitwise on its inputs.

Note: Many authorities contend that the shaped XOR gate's behavior should correspond to the odd parity gate, but there is not agreement on this point. It is also consistent with the intuitive meaning underlying the term exclusive or : A waiter asking whether you want a side dish of mashed potatoes, carrots, peas, or cole slaw will only accept one choice, not three, whatever some authorities may tell you.

I must admit, though, that I have not subjected this statement to a rigorous test. The inputs into the component. There will be as many of these as specified in the Number of Inputs attribute. Nonetheless, the input pins are in a line.

Logisim will draw short stubs illustrating this; and if you overshoot a stub, it will silently assume that you did not mean to overshoot it. In "printer view", these stubs will not be drawn unless they are connected to wires. When the component is selected or being added, the digits '0' through '9' alter its Number of Inputs attribute, Alt-0 through Alt-9 alter its Data Bits attribute, and the arrow keys alter its Facing attribute.

The two-input truth table for the gates is the following. Pins assuming component faces east West edge inputs, bit width according to Data Bits attribute The inputs into the component. East edge output, bit width according to Data Bits attribute The gate's output, whose value is computed based on the current inputs as described above. Attributes When the component is selected or being added, the digits '0' through '9' alter its Number of Inputs attribute, Alt-0 through Alt-9 alter its Data Bits attribute, and the arrow keys alter its Facing attribute.

Facing The direction of the component its output relative to its inputs. Data Bits The bit width of the component's inputs and outputs.