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ch.11 The system Unit of a Computer System - Coggle Diagram
ch.11 The system Unit of a Computer System
11.1 The Components of a computer
system unit
power supply
storage devices
motherboard
peripherals
hardware devices connected to the system unit
input
output
storage
communication
12.2 central processing unit (CPU)
communicates with other devices through bud linesr
put
output
processing
CPU
use registers to hold data during calculations
CU
keep track of the squencece of instructions being processed
register
provide storage space for A LU and CU
small number of register
general purpose register
load data from main memory into a register
control register
contain the instructions to be excused by the CPUs.
status register
used in instructions of conditional testing and program branching
system bus (Bus line)
3 Bus typeds
Data Bus
Adress Bus
Control Bus
sub-cycle
fetch
recode
excuse
measurement of CPU speed
click rate
unit: MHz / GHz
1 herts = 1 clock cycle per second
word length
11.5 main memory
RAM
access id just a hundredth of hard disk
ROM
store the permanent information supplied by the manufacturer
Non-volatile
cache memory
high-speed memory