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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 Computer of a computer
CPU is a brain of computer
Peripherals
the hardware devices connected to the system unit
types
input
monitor, keyboard, mouse....
output
printer, scanner, monitor
storage
USB flash drive
Communicate
board band modem
11.2 CPU
ALV
use register to hold data during calculations
CU
how to control
register
memory units inside a CPU; small no.
types
GPRs
Control register
Status register
System Bus(bus line)
3 bus types
data bus
adress bus
control bus
11.3 Machine Cycle
sub cycle
Fetch
Decode
Execute
11.4 Measurement of CPU Speed
clock rate
speed of CPU
unit: MHz/GHz
1hertz=1 clock cycle/s
word length
no. of bits of data and instructions can handle at one time
advantage of longer word length
more data can be process
more instructions can be included
more complicated instruction can be include
11.5 Main Memory
RAM
volatile
Temporarily hold the data
unit: B; KB; MB; GB; KB
ROM
store the permanent information
contain the bootstrap grogram
non-volatile
Ceche Memory
high speed
store data and instructions used by the CPU