ECE 09241 Lecture Notes - Priority Encoder, Canonical Normal Form, Vhsic
Document Summary
Intro to digital systems course notes: lecture 3. A multiplexor is a combinational circuit that passes one of multiple data inputs through to a single output, selecting which one based on additional control inputs. A mux"s control inputs are called select lines. Analogy: due to road construction, four lanes (the data inputs) may be reduced to a single lane (the single output). A policeman (the select inputs) selects which one lane currently passes through by blocking the other lanes. A 4x1 mux, spoken as "4 to 1 mux", has 4 data inputs, 1 data output, and requires 2 select inputs. A mux"s truth table can be converted to an equation, and then to a circuit. A jet cockpit has limited space for switches and lights. Ok" inputs coming from sensors at each of four engines. The cockpit has a single "engine temperature ok" light, and two switches for pilots to select among the four engine ok inputs.