ABSTRACT
An encoder is a circuit that changes a set of signals into a code. As a standard combinational component, an encoder is almost like the inverse of a decoder, where it encodes a 2n-bit input datum into an n-bit code. Encoders are used to reduce the number of bits needed to represent some given data either in data storage or in data transmission. Encoders are also used in a system with 2n input devices, each of which may need to request for service. When the priority encoder is enabled, then the output lines issue the binary data representation of the highest-priority input signal asserted (set to 1 for active high).
