طراحی مدارهای منطقی نیمسال دوم دانشگاه آزاد اسلامی واحد پرند

طراحی مدارهای منطقی دانشگاه آزاد اسلامی واحد پرند مقدمه ای بر سیستمهای دیجیتال

Course Objective  Design and Implementation of Digital Systems مثال: گوشي تلفن: –ورودي ها: کليدها –خروجي ها: صفحة نمايش و سيگنال هاي ارسالي به مرکز تلفن –رفتار: شماره گيري و ايجاد ارتباط مثال: خودرو: –ورودي ها: پدال ها، سوييچ، فرمان،... –خروجي ها: فرمان پيچش و چرخش چرخ ها، فرمان ترمز،... –رفتار: حرکت در مسیر مورد نظر.... مثال از سیستم های دیجیتال: –کنترلر چراغ راهنمایی –بازی x-o –کنترلر آسانسور –مدارهای محاسباتی 3

Digital Systems  Digital systems are used extensively in computation, control systems and etc.  Digital systems are capable of greater accuracy and reliability than analog systems  In a digital system, the physical quantities or signals can assume only discrete values, while in analog systems the physical quantities or signals may vary continuously over a specified range  For example, the output voltage of a digital system might be constrained to take on only two values such as 0 volts and 5 volts, while the output voltage from an analog system might be allowed to assume any value in the range -5 volts to 5 volts 4

Digital Systems  Digital systems are used extensively in computation, control systems and etc.  Digital systems are capable of greater accuracy and reliability than analog systems  In a digital system, the physical quantities or signals can assume only discrete values, while in analog systems the physical quantities or signals may vary continuously over a specified range Time 5

Design of Digital Systems  The design of digital systems may be divided into three parts: 1.System Design Breaking the overall system into subsystems and specifying the characteristics of each subsystem –Example: Digital Computer: specifying the number and type of memory units, arithmetic units, and input-output devices as well as the interconnection and control of these subsystems 6

Design of Digital Systems  The design of digital systems may be divided into three parts: 2.Logic Design Logic design involves determining how to interconnect basic logic building blocks to perform a specific function –Example: Determining the interconnection of logic gates and flip-flops required to perform binary addition 7

Design of Digital Systems  The design of digital systems may be divided into three parts: 3.Circuit Design Specifying the interconnection of specific components such as resistors, diodes, and transistors to form a gate, flip-flop, or other logic building block 8

Switching Circuits  Many of a digital system’s subsystems take the form of a switching circuit  A switching circuit has one or more inputs and one or more outputs which take on discrete values 9

Switching Circuits  Two types of switching circuits  Combinational (ترکیبی): the output values depend only on the present value of the inputs and not on past values  Sequential (ترتیبی):  Have Memory the outputs depend on both the present and past input values 10

Course Description  Number Systems  Boolean Algebra  Optimization Methods (Karnaugh map and Quine- McCluskey)  Modules: PAL, PLA, Decoder, ROM, MUX  Arithmetic Circuits  Flip-Flops  Sequential Analysis  Sequential Design  Registers – Counters  Hazard, Wired Logic, Asynchronous Design … 11

Details  Midterm Exam:5 point  Final Exam: 12 point  HWs:2 point  Activity and Quizzes:1 point  address:  Course Group: 12

References  Main Reference:  Roth, Fundamentals of Logic Design, 7 th Edition,  Others:  Katz, Contemporary Logic Design  Mano, Digital Design, 3 rd Edition, 2002, Prentice-Hall  Nelson & Nagle, Digital Logic Circuits, Analysis and Design 13