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3367105
CPU
Description
computer science - CPU
No tags specified
c
p
u
bachillerato internacional
Mind Map by
ANDRES DONOSO DIAZ
, updated more than 1 year ago
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Created by
ANDRES DONOSO DIAZ
almost 9 years ago
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Resource summary
CPU
Central Processing Unit
chip that does all of the calculations
three mayor parts
Control Unit (CU)
acts as
organizing force
does not execute instructions
controls sequence of execution
controls what is stored in the cache
takes care of fetching and decoding
works with special registers
Instruction Register (IR)
holds instruction currently being executed
Program Counter (PC)
contains address of the next instruction to be executed
Memory Data Register (MDR)
contains the data to be stored in the computer storage, or the data after a fetch from the computer storage
Connected to data bus
data can go both ways
to and from memory
can load its data from
Data bus
reading data
CPU registers
storing data
Memory Address Register (MAR)
stores memory address from which data will be fetched, sent or stored
holds memory location of data that needs to be accessed
enable communication between the memory and processing unit
uses buses to transfer information to the ALU and the CPU
Arithmetic and Logic Unit (ALU)
performs
arithmetic operations
adding
dividing
substracting
multiplying
logical operations
AND
OR
NOT
Primary memory
cache
frequently used instructions are stored here
connects with ALU and CU
uses buses to transfer information
address
addresses of locations in the primary memory are transferred
transferred with data bus
data
contains
information
instructions
connected to each other by a collection of wires
MACHINE CYCLE
1) Fetch
involves retrieving an instruction from memory
2) Decode
instructions is broken up into parts
CU
3) execute
execute is performed
4) writeback
outputs the result to some form of memory
ALU
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