Computer Organization and Design

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Presentation transcript:

Computer Organization and Design CSE211 Computer Organization and Design Lecture : 3 Tutorial: 1 Practical: 0 Credit: 4 Deepak Kumar (Asst. Professor, LPU)

Unit 1 : Basics of Digital Electronics Introduction Logic Gates Flip Flops Decoder Encoder Multiplexers Demultiplexer Registers

Integrated Circuits Small scale Integration (SSI) : less than 10 gates An IC is a small silicon semiconductors crystal called chip containing the electronic components for digital gates. Various gates are interconnected inside chip to form required circuit. Chip is mounted in ceramic/plastic container connected to external pin Small scale Integration (SSI) : less than 10 gates Medium Scale Integration(MSI) : between 10 to 200 gates (decoders, adders, registers) Large Scale Integration(LSI) : between 200 and few thousands gates ( Processors, Memory Chips) Very Large Scale Integration (VLSI) : Thousands of gate within single package ( Large Memory Arrays, Complex Microcomputer Chips)

Octal to Binary Encoder 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 1 0 0 0 0 0 1 0 0 0 1 0 0 0 0 0 1 0 0 0 0 1 1 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 0 1 0 1 0 1 0 0 0 0 0 0 1 1 0 1 0 0 0 0 0 0 0 1 1 1 D7 D6 D5 D4 D3 D2 D1 D0 A2 A1 A0 Octal to Binary Encoder D1 D2 D3 D5 D6 D7 D4 A0 A1 A2 A0 = D1 + D3 + D5 + D7 A1 = D2 + D3 + D6 + D7 A2 = D4 + D5 + D6 + D7

A Demultiplexer, sometimes abbreviated DMUX is a circuit that has one input and more than one output. It is used when a circuit wishes to send a signal to one of many devices

When the load input is 1 , the data in the four inputs are transferred into the register with the next positive transition of a clock pulse When the load input is 0, the data inputs are inhibited and the D-output of flip flop are connected to their inputs.

Any Questions ?