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Hardware Outline What Is a Computer? 1 Hardware Outline What is a Computer? 1. Hardware Outline "... [A] programmable electronic 2. What is a Computer?/Components of a Computer System device that can store, retrieve 3. Hardware That Computers Typically Have and process data." compact disc (N. Dale & D. Orshalick, 4. Hardware Components Introduction to PASCAL and Structured Design, 5. Central Processing Unit (CPU) D.C. Heath & Co., Lexington, MA, 1983, p. 2) 6. Central Processing Unit ZIP 7. Storage (Primary & Secondary) 8. Main Memory 9. Bits, Bytes, Words Hello ... 10. How Data Travel Between Memory & CPU 11. Loading Data from Main Memory into the CPU 12. Cache: Eliminating Speedbumps for the Bus 13. Secondary Storage 14. CDROM/DVDROM/Why Are Floppies So Expensive Per MB? 15. Input & Output Devices 16. Putting Bits Together 17. Powers of 2 18. Kilo, Mega, Giga, Tera, Peta Components of a Computer System COMPUTER SYSTEM HARDWARE SOFTWARE Physical Sets of devices instructions DON'T PANIC! This discussion may be confusing at the moment; it will make more sense after you've written a few programs. 1 2 Hardware That Computers Typically Have Hardware Components Central Processing Unit (CPU) HARDWARE Primary Storage CENTRAL STORAGE INPUT/OUTPUT PROCESSING Secondary Storage UNIT Primary Basic I/O Multimedia Control Cache Input Devices $1600/MB Unit 80,214 MB/sec Keyboard Speakers Output Devices Arithmetic/ Main Mouse Amplifier Logic Memory $0.83/MB Unit 4,096 MB/sec Monitor CD/DVD Registers Secondary Printer Joystick Hard etc Scanner Note: storage costs and Disk speeds are based on $0.0017/MB etc available PC systems, 100 MB/sec Jan 2003. CD−RW Networking $0.0005/MB Prices, specs courtesy of: 7.6 MB/sec Modem bestbuy.com buy.com Zip cendyne.com Disk Internet creativelabs.com $0.036/MB Port 2.4 MB/sec pricewatch.com etc toshiba.com Floppy Disk $0.10/MB 0.03 MB/sec etc 3 4 Central Processing Unit (CPU) Central Processing Unit The Central Processing Unit (CPU), also called the processor, is the Control Unit “brain” of the computer. It has three main parts: the Control Unit, Load Increment Find Data Next Instruction Addresses in the Arithmetic/Logic Unit and Registers. Instruction Pointer Memory The Control Unit decides what to do next; for example: Load Data Execute Store from Result in – load data from main memory into the registers (see below); Memory Instruction Memory – perform an arithmetic or logical operation (see below); . – store data from the registers into main memory; Arithmetic/Logic Unit – choose among several possible courses of action (branch). Add Multiply Divide The Arithmetic/Logic Unit (ALU) performs arithmetic & logical R03 = R03 + R63 R02 = R00 * R01 R02 = R00 / R01 operations. Compare Bit Shift Bit Invert – Arithmetic operations: add, subtract, multiply, divide, etc. R00 < R01? R00 << R01 R03 = ~R01 – Logical operations: compare two numbers to see which is . greater, check whether a true-false statement is true, etc. Registers Registers are memory-like locations where data reside when they’re R00 being used right now; for example, the operands being used by R01 the current arithmetic or logical operation, or the result of the R02 R03 arithmetic or logical operation that was just performed. CPU Examples: R63 Intel Pentium 4/AMD Athlon XP (Windows PC) The Control Unit makes decisions about what to do next; e.g., load data from memory, perform an arithmetic/logical operation, store data to memory, etc. Intel Itanium (servers) The Arithmetic/Logical Unit performs operations on data that are in registers. Motorola PowerPC G4 (Macintosh) The Registers are where operands must reside in order to be used in operations, Hewlett-Packard Alpha EV68 (servers) and where the results of operations go before being stored in memory. Registers are VERY expensive, because they are etched directly into the CPU. You can see a picture of the exterior and innards of a Pentium 4 at: Cache is also expensive, because it's also etched into the CPU, but it isn't directly connected to the Control Unit or Arithmetic/Logic Unit. Cache operates at speeds http://www6.tomshardware.com/cpu/02q1/020107/p42200-04.html similar to registers, but cache is MUCH bigger (about 1,000 times as big). Memory is cheap, because it isn't part of the CPU, but it's much slower than cache. 5 6 Storage (Primary & Secondary) Main Memory Primary Storage Memory is made up of locations (also called cells ). Each location has a unique integer address that never changes. Primary storage is where data and instructions reside when they’re Each location has a value (also called the contents ) being used by a program that’s currently running. that the CPU can get or change. Primary storage typically is volatile: the data disappear when Address the power is turned off. 0 1 2 3 4 5 6 7 Primary storage typically comes in two types: – Cache memory is where data reside when a currently run- 8 9 10 11 12 13 14 15 ning program is going to use them very very soon. 16 17 18 19 20 21 22 23 Cache is very fast (e.g., the same speed as the CPU). Cache is very expensive (e.g., $1600 per MB). 24 25 26 27 28 29 30 31 – Main memory (RAM) is where data reside when a currently running program is going to use them at some point during . −71 the run (whether soon or not). Main memory is slow compared to CPU speed (e.g., about Location (Cell) Highest Address 5-20% as fast as the CPU). e.g., 268,435,455 Value (Contents) Main memory is much cheaper than cache (e.g., 35 cents Lowest Address (256 MB) per MB). 0 1 2 3 4 5 6 7 8 Secondary Storage . Secondary storage is the place where data and instructions re- We can think of memory as one contiguous line of cells. side that will be used in the future. RAM: Random Access Memory Secondary storage is not volatile: the data remain when the Memory that the CPU can read from, write to and address arbitrarily power is turned off. (i.e., can read or write any location at any time, not just in a sequence). We often use `Main Memory,' `Memory' & `RAM' interchangeably. Secondary storage is much cheaper than primary storage (e.g., a fraction of a cent to several cents per MB). ROM: Read Only Memory Memory that the CPU can read from but not write to, Examples: hard disk, CD, DVD, Zip disk, floppy, magnetic tape and can address arbitrarily. Most kinds are portable: you can pop the media (e.g., floppy disk, CD) out of the drive and carry it to another computer. 7 8 Bits, Bytes, Words How Data Travel Between Memory & CPU Bit (Binary digIT) The bus is the connection from the CPU to main memory; all data travel along it. – Tiniest possible piece of memory For now, we can think of the bus as a big wire connecting them. – Made of teeny tiny transistors wired together – Has 2 possible values that we can think of in several ways: ALU CPU Control Low or High: Voltage into transistor Registers Off or On: Conceptual description of transistor state False or True: “Boolean” value for symbolic logic 0 or 1: Integer value Bus – Bits aren’t individually addressable: the CPU can’t load from or store to an individual bit of memory. Main Memory Byte: a package of 8 contiguous bits (typically) – On most platforms (kinds of computers), it’s the smallest addressable piece of memory: typically, the CPU can load from or store to an individual byte. – Possible integer values: 0..255 or -128..127 (to be explained later) – Can also represent a character (e.g., letter, digit, punctuation) Word: a package of 4 or 8 contiguous bytes (typically) – On a few platforms (e.g., Cray J90), the smallest possible addressable piece of memory – Standard size for storing a number (integer or real) – Standard size for storing an address (special kind of integer) Kilobyte (KB): approximately 1,000 bytes Megabyte (MB): approximately 1,000,000 bytes Gigabyte (GB): approximately 1,000,000,000 bytes Terabyte (TB): approximately 1,000,000,000,000 bytes Petabyte (PB): approximately 1,000,000,000,000,000 bytes 9 10 Loading Data from Main Memory into the CPU Cache: Eliminating Speedbumps for the Bus I want the If a 3 GHz CPU can perform 6 billion operations per sec (134 GB/s), contents of but its 533 MHz memory bus moves data at only 4 GB/sec, 09140980. Zzzzz ... then moving data between the CPU and main memory is a bottleneck. Cache is a smaller memory that runs at the same speed as the CPU. CPU Main Memory If the data are in cache, then the CPU can access them more quickly. Cache is typically about 128,000 to 2 million bytes, Bus while main memory is typically about 64 million to 4 billion bytes. Zzzzz ... CPU Load (3000 MHz) putt putt putt ... CPU 09140980 Main Memory Bus Cache (3000 MHz) Yikes! Bonk! Load Main Memory Bottleneck CPU 09140980 Bus (533 MHz) Main Memory Bus There you go! −75 CPU Main Memory Bus I'll put it in register R05. Zzzzz ... Bonk! −75 CPU Main Memory Rule of thumb for the relationship between speed, price and size: Bus fast implies expensive implies small, slow implies cheap implies big. 11 12 Secondary Storage CDROM/DVDROM When a CD or DVD holds data instead of music or a movie, it acts Nonvolatile: data don’t disappear when power is turned off very much like Read Only Memory (ROM): Much larger, much slower and much cheaper than main memory it can only be read from, but not written to; Most are portable: can be easily removed from your computer it’s nonvolatile; and taken to someone else’s it can be addressed essentially arbitrarily (it’s not actually arbi- Medium Speed* Size* Media Can Port- Popular? Drive Media trary, but it’s so fast that it might as well be).
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