【正文】 binational logic circuits, flipflops and related devices, programmable logic devices, sequential logic circuits, largescale integrated circuits, and analogtodigital and digitaltoanalog converters. Course Description: ? One of the core courses for EE amp。 Serial Data Transfer(串行傳輸 ) ? When bits are transferred in serial form from one point to another, they are sent one bit at a time along a single conductor. To transfer n bits in series, it takes n time intervals. Parallel Data Transfer(并行傳輸 ) ? When bits are transferred in parallel form, all the bits in a group are sent out on separate lines at the same time. There is one line for each bit. To transfer n bits in parallel, it takes one time interval. 13 BASIC LOGIC OPERATIONS 基本邏輯運(yùn)算 Introductory Paragraph ? In its basic form, logic is the realm of human reasoning that tells you a certain proposition (declarative statement) is true if certain conditions are true. Propositions can be classified as true or false. Many situations and processes that you encounter in your daily life can be expressed in the form of propositional, or logic, functions. Since such functions are true/false or yes/no statements, digital circuits with their twostate characteristics are applicable. Logic Functions（邏輯函數(shù)） ? Several propositions, when bined, form propositional, or logic functions. For example, the propositional statement “The light is on” will be true if the “The bulb is not burned out” is true and if “The switch is on” is true. The first statement is then the basic proposition, and the other two statements are the conditions on which the proposition depends. Boolean Algebra（布爾代數(shù)） ? In 1850s, the Irish logician and mathematician Gee Bool developed a mathematical system for formulating logic statements with symbols so that problems can be written and solved in a manner similar to ordinary algebra. Basic Logic Operations（基本邏輯運(yùn)算） ? In Boolean algebra, there are three basic logic operations: NOT, AND, and OR. ? Each of the three basic logic operations produces a unique response (output) to a given set of conditions (inputs). ? The standard distinctive shape symbols for the three basic logic operations are shown below. Logic Gates（邏輯門） ? A circuit that performs a specified basic logic operation is called a logic gate. Logic gates form the building blocks for digital systems. ? The true/false statements mentioned earlier are represented by a HIGH (true) and a LOW (false). ? AND and OR gates can have any number of inputs. The NOT Operation（非運(yùn)算） ? The NOT operation changes one logic level to the opposite logic level. ? The NOT operation is implemented by a logic circuit known as an inverter (NOT gate). The AND Operation（與運(yùn)算） ? The AND operation produces a HIGH output only if all the inputs are HIGH. When any or all inputs are LOW, the output is LOW. ? The AND operation is implemented by a logic circuit known as an AND gate. The OR Operation（或運(yùn)算） ? The OR operation produces a LOW output only if all the inputs are LOW. When any or all inputs are HIGH, the output is HIGH. ? The OR operation is implemented by a logic circuit known as an OR gate. 14 BASIC LOGIC FUNCTIONS 基本邏輯功能 Introductory Paragraph ? The three basic logic elements AND, OR, and NOT can be bined to form more plex logic circuits that perform many useful operations and that are used to build plete digital systems. Some of the mon logic functions are parison, arithmetic, code conversion, encoding, decoding, data selection (multiplexing, demultiplexing), storage, and counting. This section provides a general overview of these important functions so that you can begin to see how they form the building blocks of digital systems such as puters. The Comparison Function（比較） ? Magnitude parison is performed by a