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Lecture 11 - Logic gates and Boolean. The basic logic gates are the inverter (or NOT gate), the AND gate, the OR gate and the exclusive-OR gate (XOR). If you put an inverter in front of the AND gate, you get the NAND gate etc. One of the common tool in specifying a gate function is the truth table. All possible combination of the inputs A, B ...
Definitions. Schematic: A drawing of interconnected gates. Net: Wires at the same voltage (electrically connected) Netlist: A list of all the devices and connections in a schematic. Fan-in: The # of inputs to a gate. Fan-out: The # of loads the gate drives. 4.
Gates Logic blocks are built from gates that implement basic logic functions. For exam-ple, an AND gate implements the AND function, and an OR gate implements the OR function. Since both AND and OR are commutative and associative, an AND or an OR gate can have multiple inputs, with the output equal to the AND or OR of all the inputs.
• From Switches to Logic Gates to Logic Circuits • Understanding the foundations of • Computer Systems Organization and Programming • e.g. Galaxy Note 9 Goals for Today 3
What are logic gates? • Logic gates turn ON when a certain condition is true, and OFF when the condition is false – They check whether or not the information they get follows a certain rule • They either spit out the answer true (ON) or false (OFF) • Remember: – True= ON = 1 – False = OFF=0
The basic components of an Integrated Circuit (IC) is logic gates which made of transistors, in digital system there are three basic logic operations and they are called AND, OR and NOT.
Logic gates. A major advance that the invention of transistors allowed was the mass production of logic gates, the next building block in microprocessors. Logic gates are circuits that implement the logical AND, OR, NOT and other boolean functions, whose truth tables we studied last week.