Redstone circuits/Logic/XNOR

In logic, this is commonly referred to as "if and only if," "bi-conditional," or "iff" for short. An XNOR gate activates only when the inputs are equal to each other. Like the XOR gate, when either input changes, the output changes.

An XNOR gate can be built by inverting either the output, or one input, of an XOR gate. A basic use of XNOR in Minecraft would be to wire up two levers to the same door. Changing either input would then change the state of the door.

Design F has the output between the inputs, instead of opposite. For designs F and G, note the wire under the output torch.