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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.
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.
16 Ιαν 2024 · A truth table lists possible combinations of inputs and similar outputs. All logic gates follow their truth table. Digital logic gates are made to form RTL (resistor-transistor logic) or DTL (diode-transistor logic) circuits from discrete parts such as resistors, transistors, and diodes.
Reduce the number of gates? Reduce the number of gate inputs? Reduce the number of cascaded levels of gates? 14 What is the optimal realization? How do we explore the tradeoffs? Logic minimization: Reduce number of gates and complexity Logic optimization: Maximize speed and/or minimize power CAD tools 15 Canonical forms Canonical forms
• 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
Logic gates are circuits that implement the logical AND, OR, NOT and other boolean functions, whose truth tables we studied last week. There are many ways to implement logic gates using transistors, but the most common is known as comple-mentary metal{oxide{semiconductor, or CMOS, which uses pMOS and nMOS transistors in a complemen-tary manner.
