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Flashcards in system architecture Deck (22)
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1


processor


A machine that processes something . The brains of the computer, carry's out instructions, speed is measured in hertz

2

MHz


Megahertz measures clock speed, 1 million instructions a second

3

GHz


Gigahertz a measure of frequency equivalent to one the sand million (one billion) cycles per second

4

hertz

Number of cycles per seconds

5

instructions


An action of introducing something

6

execute


Carry out an instruction

7

embedded system


A computer within another device

8

clock speed


The speed the processor carry's out instructions

9

cache


Very fast memory between the processor and RAM (random access memory)

10

core


Part of the processor that executes instructions, dual core can do twice as many instructions where as a quad core can do 4 times

11


Von Neumann Architecture


Is the computer hardware when program instructions and data are held in the same memory whereas Harvard architecture has separate memory for instructions and another one for data

12

pc


program counter – holds the address of the next instruction to be fetched

13

MAR


memory address register – holds the address of the location in the main memory that is to be fetched or written to

14

MDR


memory data register – holds data fetched from memory or about to be written to memory

15

CIR


current instruction register – holds the instruction that has been fetched from memory and is decoded and instruction is split into a op cord (operation to be preformed) and the operand ( data to preform the operation on)

16

ALU


arithmetic + logic unit – preform arithmetic ( + - ) and preforms logic ( and, or)

17

Accumulator


holds the result of a calculation and a value that has been input

18

Address bus


carries the address from the MAR to the main memory

19

data bus


his carries data/instructions from main memory to the MDR or from the MDR to the main memory

20

Control bus


this carries data/instructions from main memory to the MDR or from the MDR to the main memory

21

RAM


random access memory is a form of computer data storage that stores data and machine code currently being used. RAM is volatile which means the contents are lost when power is removed.

22

ROM


Read only memory is a type of non- volatile memory used in computers and other electronic devices. ROM is non-volatile which means the contents are saved. The main use of ROM is to hold the "boot up" or "start up" instructions.