AR lecture one.ppt - Computer Architecture Org Unit \u2013 Digital Computer Bizuayehu Getnet [email protected] Comp Architecture Digital Computer 1

AR lecture one.ppt - Computer Architecture Org Unit –...

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Comp Architecture - Digital Computer 1 Computer Architecture & Org. Unit – Digital Computer Bizuayehu Getnet [email protected]
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Comp Architecture - Digital Computer 2 Outline Introduction Digital Signal Boolean Algebra Logic Gates Combinational Circuits Sequential Circuits
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Digital signal Digital signal signal which has only a finite number of distinct values Digital signal are not continuous signal digital electronic calculator Binary Signal Octal Signal Hexadecimal Signal Comp Architecture - Digital Computer 3
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Digital Signal (Binary) Comp Architecture - Digital Computer 4
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Cont… The circuits that process that digital signal are called digital systems or digital circuits. Examples of the digital systems are following. Registers Flip-flop Counters Microprocessors Comp Architecture - Digital Computer 5
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Advantages of Digital Systems More accuracy More versatility Less distortion Easy communicate Possible storage of information Comp Architecture - Digital Computer 6
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Digital Computers Digital Computer = H/W + S/W Digital implies that the information in the computer is represented by variables that take a limited number of discrete values. the decimal digits 0, 1, 2,….,9, provide 10 discrete values, but digital computers function more reliably if only two states are used. Comp Architecture - Digital Computer 7
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Cont… Bit = binary digit : 0/1 Program(S/W) A sequence of instruction S/W = Program + Data The data that are manipulated by the program constitute the data base Application S/W = DB, word processor, Spread Sheet System S/W = OS, Firmware, Compiler, Device Driver Comp Architecture - Digital Computer 8
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Computer Hardware(H/W) CPU Memory Program Memory(ROM) Data Memory(RAM) I/O Device Interface: 8251 SIO, 8255 PIO, 8272 FDC, 8237 DMAC, 8279 KDI Input Device: Keyboard, Mouse, Scanner Output Device: Printer, Plotter, Display Storage Device(I/O): FDD, HDD, MOD Comp Architecture - Digital Computer 9
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Logic Gates ADC(Analog to Digital Conversion) Signal ---- Physical Quantity --- Binary Information Gate The manipulation of binary information is done by logic circuit called “gate”. Blocks of H/W that produce signals of binary 1 or 0 when input logic requirements are satisfied. Digital Logic Gates AND, OR, INVERTER, BUFFER, NAND, NOR, XOR, XNOR Comp Architecture - Digital Computer 10
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Digital Logic Gates Comp Architecture - Digital Computer 11
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Boolean Algebra Boolean Algebra Deals with binary variable (A, B, x, y: T/F or 1/0) + logic operation (AND, OR, NOT…) Boolean Function: variable + operation F(x, y, z) = x + y’z Comp Architecture - Digital Computer 12
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  • Fall '19
  • Boolean Algebra, Logic gate, Combinational Circuits,  Examples of the digital systems

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