Priority Encoder Gate Level Circuit Diagram. It is an 8 to 3 inverting priority encoder. The priority encoder comes in many different forms with an example of an 8 input priority encoder along with its truth table shown below.
They are often used to control interrupt requests by acting on the highest priority interrupt input. 8 to 3 bit priority encoder priority encoders are available in standard ic form and the ttl 74ls148 is an 8 to 3 bit priority encoder which has eight active low logic 0 inputs and provides a 3 bit. The priority encoder comes in many different forms with an example of an 8 input priority encoder along with its truth table shown below.
As we are describing a priority encoder using gate level modeling let s see the logic circuit.
This means that whenever two inputs are equal to logic 1 simultaneously then the encoder must prioritise the level of each input such that it produce output corresponds to highest priority input. Here and gate inverter combination are used for producing a valid code at the outputs even when multiple inputs are equal to 1 at the same time. Let us analyse a 4 2 priority encoder as an example to understand how it differs from a normal encoder and it can overcome the above mentioned two drawbacks. Y3 y2 y1 y0 and 2 outputs.
