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An Example Architecture

Explore the architecture of Woody's Paper Computer, including main memory, addressing, CPU components, and machine language characteristics. Learn about word size, memory size, addressing bits, and instruction execution in this unique system.

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An Example Architecture

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  1. An Example Architecture

  2. A Paper Computer - Woody • Woody's characteristics • Word size – 8 bits One word

  3. A Paper Computer - Woody Main Memory • Woody's characteristics • Word size – 8 bits • Memory size – 32 words ...

  4. A Paper Computer - Woody Main Memory • Woody's characteristics • Word size – 8 bits • Memory size – 32 words • Memory addresses are 0 through 31 How many bits does it take to represent an address? ...

  5. A Paper Computer - Woody Main Memory • Woody's characteristics • Word size – 8 bits • Memory size – 32 words • Memory addresses are 0 through 31. 3110 = 111112 ...

  6. A Paper Computer - Woody Main Memory • Woody's characteristics • Word size – 8 bits • Memory size – 32 words • Memory addresses are 0 through 31. 3110 = 111112 • Addresses can be represented with 5 bits 00000 00001 00010 00011 00100 00101 00110 00111 01000 01001 ... 11110 11111

  7. A Paper Computer - Woody Main Memory • Woody's characteristics • Word size – 8 bits • Memory size – 32 words • Memory addresses are 0 through 31. 3110 = 111112 • Addresses can be represented with 5 bits • Woody uses signed magnitude representation for storing integers (no floating point) 00000 00001 00010 00011 00100 00101 00110 00111 01000 01001 ... 11110 11111

  8. Woody's CPU Central Processing Unit • Instruction register – holds currently executing instruction from program • Program Counter Register – hold address of next instruction to execute • Data Register – holds the data used in the execution of an instruction Instruction Register Program Counter Register Data Register

  9. Other Components • Input unit – device that allows the user to enter values – e.g. keyboard • Output unit – device that allows Woody to display a value (e.g. screen)

  10. Woody's Assembly Language

  11. Machine Language • Instructions must be in binary form to execute • Woody can't store "CopyFrom" nor understand what to do with it • It is easiest if all instructions are the same size and fit into a single word • How big can our instructions be?

  12. Woody's Machine Language

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