TAMS / Java / Hades / **applets** (print version): contents | previous | next#### XOR and XNOR gates

**Description**

A demonstration of the **XOR and XNOR gates**.
Click the input switches to toggle the corresponding input value
between 0 and 1, and watch the resulting behaviour.
You can also use shift+click to toggle the input value between
the states 0, 1, Z (tri-state, not driven) and X (undefined).
Alternatively, type the indicated bindkeys (a,b,s,d,f,g,w,e,r,t)
to control the switches.

Note that two different interpretations exist for the concept
of a 'multiple-input' XOR gate.
First, the 'either A or B or C or ...' interpretation means
'exactly one of the inputs is true'.
The second interpretation constructs a multiple-input XOR gates
from a cascade (chain/tree) of two-input XOR gates,
which corresponds to the parity of the input values.

For example:
The following table shows the truth-table of the different gates
for three inputs:

C B A 1-of-3 even-parity odd-parity
0 0 0 0 1 0
0 0 1 1 0 1
0 1 0 1 0 1
0 1 1 0 1 0
1 0 0 1 0 1
1 0 1 0 1 0
1 1 0 0 1 0
1 1 1 0 0 1

For a demonstration of the parity interpretation,
see the parity generator applets at
and
.

Run the applet | Run the editor (via Webstart)

Impressum | 24.11.06

http://tams.informatik.uni-hamburg.de/applets/hades/webdemos/10-gates/00-gates/xor_print.html