4x2 Encoder Circuit Diagram. Similar to the multiplexer circuit the decoder is not restricted to a particular address line and thus can have more than two outputs with two three or four address lines. A 4 to 2 priority encoder takes 4 input bits and produces 2 output bits.
What is an encoder. The circuit uses a 4 input or gate ic you can also simplify the boolean expression to use other normal 2 input gate ic s. However in a simple encoder only one of the inputs is considered to be high out of all the 2 n inputs.
An encoder is a combinational circuit that performs the reverse operation of decoder it has maximum of 2 n input lines and n output lines hence it encodes the information from 2 n inputs into an n bit code it will produce a binary code equivalent to the input which is active high.
There are different types of encoders and decoders like 4 8 and 16 encoders and the truth table of encoder depends upon a particular encoder chosen by the user. Vhdl code for 4 to 2 encoder can be designed both in structural and behavioral modelling. The collection of equations is summarized here. Equation collection summary.
