UNIT 1 LESSON 2: Functions and Characteristics of the CPU
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- Created on: 18-04-19 19:24
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- UNIT 1 LESSON 2: FUNCTIONS AND CHARACTERISTICS OF THE CPU
- ALU
- Arithmetic Logic Unit
- performs 2 types of operations on data
- logic operations
- < >, =
- arithmetic operations
- +, -, *, /
- logic operations
- Control Unit
- controls input and output of data
- controls and monitors hardware attached to the system
- controls the flow of data within the CPU
- Factors that affect the performance of the CPU
- cache size
- how big the cache is, affects the speed
- small amount of very fast, expensive memory in the CPU
- can be accessed faster than regular main memory (RAM)
- clock speed
- how many instructions are done per second
- cycles per second measured in Hertz (Hz)
- the faster the clock speed, the faster the instructions are processed
- core number
- how many sets of the parts CPU it has
- a dual-core processor has 2 processors linked. a quad-core processor has 4 processors linked
- a quad-core processor working on many different tasks simultaneously, under ideal conditions can be up to 4 times faster than a single-core processor
- cache size
- cache
- Levels of cache memory
- CPU
- registers
- level 1 cache
- level 2 cache
- physical RAM (main memory)
- disc storage (virtual RAM. hard drive)
- < - capacity ->
- disc storage (virtual RAM. hard drive)
- ^ cost per byte / access speed
- physical RAM (main memory)
- level 2 cache
- level 1 cache
- registers
- CPU
- CPU or processor cache
- cache used by the CPU to reduce average time to access memory
- disk cache
- mechanism for improving the time it takes to read from or write to a hard disk drive
- benefits of cache
- other data from CPU in level 2, 95% of the time
- most data used in the CPU in level 1
- web cache
- folder of web pages that is maintenance by the web browsers
- memory cache
- is RAM ht a computer microprocessor can access more quickly than it can access regular RAM
- Levels of cache memory
- embedded systems
- it has a single microprocessor that includes RAM, ROM and a CPU
- cars, washing machines, DVD player
- all the software it needs is installed at manufacture
- microprocessors / CPUs to control their functions, unique
- ALU
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