Manchester Encoder and Decoder with Clock Recovery Unit and Invalid Detector

Abstract

Communication has become a major part of our day to day life. The idea, knowledge or data that we have with us, is communicated over the world using some techniques. The data we send are in the form of bits or binary values (as 0s or 1s). To make the transmitting data robust, efficient and accurate we use some encoding/decoding techniques. One such coding technique is the ‘Manchester coding’ which comes under Digital Line Encoding and Decoding techniques that are widely used in Industrial applications. The transmission of data through communication buses and networks are generally in the form of binary digits (i.e. 0’s and 1’s). To avoid the DC term in the transmitting signal we are going for Manchester which makes a transition at the middle of each bit. This paper deals with the implementation of a Manchester Encoder and Decoder circuit along with invalid detection and clock recovery unit (CRU) using HDL (Hardware Description Language). This encoding technique is widely used in fields like Satellite Communication, Bio-medical applications, Servo systems, Magnetic recordings etc.