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Understanding the CPU: Inside Computer Components

Learn about the Control Unit, ALU, Registers, Data Representation, Memory Types, Microprocessors, System Unit, Processor “Speed,” Cache, and Factors Affecting Computer Speed. Discover how to shop for a computer based on your needs.

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Understanding the CPU: Inside Computer Components

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  1. Chapter 4 The Central Processing Unit: What goes on Inside the Computer

  2. Components of the CPU • Control Unit (CU) • Directs system operations • Communicates with the ALU and memory • Arithmetic Logic Unit (ALU) • Performs calculations

  3. ALU Operations • Arithmetic operations • Addition (+) • Subtraction(-) • Multiplication (×) • Division (÷) • Logical operations • Equal-to (=) • Less-than (<) • Greater-than (>)

  4. Components of the CPU • Registers • Temporary storage • High speed • Not part of memory • System clock • Controls speed of processing • Does not keep date/time

  5. Instruction Execution • Machine cycle: • Fetch – get an instruction • Decode – interpret, then get data from memory • Execute – perform the instruction • Store – move the result to memory or a register

  6. Data Representation • Bit (Binary Digit) • ON (1) • OFF (0) • Byte • 8 bits • Stores one character • Word • Number of bits processed at one time • The size of a register • 32 or 64 bits for PCs

  7. Coding Schemes • Assigns a number to each characters • ASCII – 1 byte per character • Used on PCs and larger computers • 256 possible characters • EBCDIC – 1 byte per character • Used on IBM mainframes • 256 possible characters

  8. Coding Schemes • Unicode – 2 bytes per character • Allows characters from languages other than English • Used by Java, a programming language for the web • 65,536 possible characters

  9. Memory Types • RAM • Random Access Memory • Volatile – lost if the power goes off • Often called main memory • ROM • Read Only Memory • Non-volatile • Required for booting the computer

  10. Memory Types • CMOS RAM • Stores info about computer hardware • Requires battery power

  11. Memory • Each location has unique address • Fast access regardless of location • Programmers use names instead of address numbers

  12. Memory and Storage Capacities • Kilobyte (KB or K) – approx. one thousand bytes • Exactly 1024 bytes • Megabyte (MB) – approx. one million bytes • Gigabyte (GB) - One billion bytes • Terabyte - One trillion bytes

  13. System Unit • the box or case that houses the electronic components of the computer • Inside the system unit you find: • CPU • Memory • Motherboard • Power supply • And much more

  14. System Unit’s Motherboard • CPU • Memory • Expansion slots • Connections to other components

  15. Microprocessors • Intel • Pentium • Celeron • Xeon, Itanium • Intel-compatible • Cyrix, AMD • Non-Intel • PowerPC • Alpha

  16. System Bus • Copper lines on the motherboard • For example, from memory to CPU • Transports data and instructions • Bus width • Bus speed

  17. Expansion Buses • Expansion boards • Ports • Serial ports • Parallel ports • Universal Serial Bus (USB) • PC Card Bus

  18. Measuring Computer Time • Millisecond—one thousandth of a second • Microsecond—one millionth of a second • Nanosecond—one billionth of a second • Picosecond—one trillionth of a second

  19. Computer Processor “Speed” • The frequency of pulses from the system clock • MHz – megahertz, one million pulses (ticks) per second • GHz – gigahertz, one billion pulses per second • The higher the number, the faster the CPU can process instructions.

  20. PC Processor “Speed” • Common processor frequencies • 1.53 Gigahertz ( 1,530,000,000 ticks per second ) • 1.8 GHz • 2.2 GHz • 2.8 GHz

  21. Cache • Very fast memory • Stores frequently used instructions • Level 1 - Built into the processor chip • Level 2 - Separate chips • Usually 256 KB or 512 KB • Cheaper than level 1 • Most PCs have Level 2 cache

  22. Flash Memory • Nonvolatile RAM • Uses • Cellular phones • Digital cameras • Handheld computers

  23. Some of the factors affecting overall speed of a computer • CPU speed • Amount and speed of RAM • Speed and size of bus lines • Amount and speed of L1 and L2 cache • Register size (Word size)

  24. Shopping for a Computer • Decide what software you will need. • What do you want to do with the computer? Email? Web browsing? Word Processing? Spreadsheet? Make CD’s? Edit photos or movies? ???

  25. Shopping for a Computer 2. Determine the types of hardware needed for the software. Make a list of hardware specifications. Email, Web browsing, and other Internet related software requires a modem or other hardware to connect to the Internet.

  26. Shopping for a Computer Word processing, spreadsheet, and presentation graphics don’t require a super-fast processor or much memory. Want to print your document? You will need a printer.

  27. Shopping for a Computer Large databases, lots of music files, photos, or videos require a large amount of hard drive space and a lot of memory. Want to make your own music CDs? You need a writable CD drive.

  28. Shopping for a Computer If you use statistical or mathematical, photo editing, or video editing software, you’ll need a fast processor and a lot of memory. Want to watch movies on your computer? You’ll need a DVD drive and a fast processor.

  29. Shopping for a Computer 3. Set a price range. Typical PC’s sell from $ 500 to $ 2000 Some software will come with the system, but you may need to purchase additional software to meet your needs. The cheapest computer is usually not the best choice.

  30. Shopping for a Computer 4. Learn about manufacturers, their reputations, service and support provided, etc. Instructor’s Top 5: Hewlett-Packard (Compaq) Dell Gateway IBM Sony

  31. Shopping for a Computer 5. Compare available systems Sunday paper ads Store flyers TV ads Manufacturer’s web sites Watch the fine print. “after rebates”, “monitor sold separately”, “when you sign up for MSN”, are common.

  32. This Week’s Ad • Celeron Processor: 2.4 GHz (gigahertz) • Memory: 256 MB (megabytes) • Hard drive: 80 GB (gigabytes) • Other drives: DVD and CD-RW • Monitor: 17” color • Printer: color inkjet • Manufacturer: Medion • $829.97 ($549.97 after rebates)

  33. End of Chapter Questions 1. The electrical circuitry that executes program instructions is the ______. a. register b. operator c. central processing unit d. bus line

  34. End of Chapter Questions 2. The entire computer system is coordinated by ___. a. the ALU b. the control unit c. registers d. arithmetic operators

  35. End of Chapter Questions 5. The primary storage unit is also known as _____. a. a register b. Mass storage c. Secondary storage d. memory

  36. End of Chapter Questions 8. Computer operations are synchronized by _____. a. the CPU clock b. The binary system c. megabytes d. E-time

  37. End of Chapter Questions 12. A letter, digit, or special character is represented by a ______. a. bit b. byte c. kilobyte d. megabyte

  38. End of Chapter Questions 14. _____ cache is built into the CPU chip. a. L1 b. L2 c. external d. disk

  39. End of Chapter Questions 16. The main circuit board in a personal computer is called the _____. a. fatherboard b. motherboard c. ram/bus board d. ASCII board

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