Components of the PC (How a processor works).


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The Computer itself.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Memory. ControlUnit. ALU. Collector. Processor. InputOutputUnit. Information Bus. . . . SCR. Damage. MDR. 123456789101112. Fringe Devices. . . . . . CIR. Terms. Memorymain memory (RAM), electronic, quick, unpredictable, costly, holds information at present in use.made up of numerous universally useful capacity locatio
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Slide 1

Components of the Computer (How a processor works) C.S. French Chapter 19

Slide 2

The Computer itself. Processor Memory Control Unit ALU 1 2 3 4 5 6 7 8 9 10 11 12 CIR Accumulator SCR Input Output Unit Peripheral Devices MAR MDR Data Bus

Slide 3

Terms Memory fundamental memory (RAM), electronic, quick, unstable, costly, holds information as of now being used. comprised of numerous universally useful capacity areas. may hold information or guidelines. areas alluded to by their \'locations\'. Information Bus an arrangement of wires for transmitting information. Processor controls the PC and completes handling. Register an extraordinary reason stockpiling area in the processor. Control Unit controls the stacking and execution of guidelines. MDR (Memory Data Register) holds information briefly as it enters and leaves the processor.

Slide 4

More Terms ALU (Arithmetic and Logic Unit) does number juggling and rationale operations. (include, subtract, AND, NOT and so on) Accumulator holds the consequence of the last operation completed by the ALU. CIR (Current Instruction Register) holds the direction that is at present being deciphered and executed by the Control Unit. Deface (Memory Address Register) holds the location of the memory area which is as of now associated with the information transport. (controls access to memory) SCR (Sequence Control Register) holds the location of the memory area of the direction that will be executed after the present one is done. this is "increased" by 1 every time it is replicated to the MAR.

Slide 5

Peripheral Devices Input console, mouse, standardized tag perusers, camera, amplifier and so on Output screen, printer, plotter, mechanical gadget and so on. Correspondences modem, ISDN connector, system card and so on. Backing Storage moderate, non-unpredictable, generally mechanical, shoddy. floppy circle, hard plate, CDROM, attractive tape, zip plate

Slide 6

How the PC works. Machine directions and information are put away in memory in paired configuration. A machine direction comprises of 2 sections: Operation code: holds the double code for the operation that will be completed by the processor. Operand address: this is the location in memory where the processor may observe the information that will be worked on. Machine directions are "brought" from memory and after that "executed" by the processor. From this slide and the following, 1 st years would be relied upon to have the capacity to portray the rule of the get/execute cycle instead of the points of interest of how this cycle is actualized.

Slide 7

The Fetch/Execute cycle. The location of the following direction to be executed is replicated from the SCR to the MAR. The SCR is augmented by 1. The data is duplicated from memory to the MDR. The substance of the MDR is replicated to the CIR. The operation code part of the guideline in the MDR is duplicated to the control unit. The control unit perceives the direction and executes it (the execution will differ contingent upon the guideline).

Slide 8

The LOAD direction. (Not required for 1 st years) Purpose: to load information from memory to the collector. The operation address part of the CIR is duplicated to the MAR. The area in memory is duplicated to the MDR. The MDR is duplicated to the collector.

Slide 9

The STORE direction (Not required for 1 st years) Purpose: to duplicate the substance of the collector to an area in memory. The operation address part of the CIR is replicated to the MAR. The aggregator is replicated to the MDR. The MDR is replicated to the area in memory .

Slide 10

The ADD guideline (Not required for 1 st years) Purpose: to include the substance of a memory area to the substance of the aggregator. The operand address in the CIR is replicated to the MAR. The substance of memory is replicated to the MDR. The MDR substance are replicated to the ALU which adds it to the gatherer, putting the outcome in the collector.

Slide 11

The JUMP guideline. (Not required for 1 st years) Purpose: to move control in a project to a guideline other than the following one. The substance of the operand location are duplicated to the SCR. Varieties: JUMP NEGATIVE JUMP ZERO JUMP POSITIVE The substance of the operand location are just duplicated to the SCR if the gatherer is in the right condition.

Slide 12

Machine dialect works out (Not required for 1 st years) Given the parallel codes for these machine guidelines compose the projects portrayed beneath. LOAD 0001 STORE 0010 ADD 0011 JUMP 0100 JUMP + 0101 JUMP - 0110 JUMP 0 0111 Program to include the substance of memory areas 10 and 11 and store the outcome in area 12. Project to check down from 9 to zero.

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