Arquitectura de Von Neumann | Explicación con ejemplos

Architecture of Walmart and the Von Neumann Model

Introduction to Computer Architecture

• The speaker introduces the topic of computer architecture, specifically referencing Walmart's architecture and its operational program.

• The discussion is based on the conceptual model established by John von Neumann in 1945, which outlines how modern computers function and interconnect hardware components.

Key Components of the Computer System

• Memory: Responsible for storing data and instructions.

• Bus: Transfers information between various hardware components.

• Control Unit: Directs other elements of the computer on what actions to perform.

• Arithmetic Logic Unit (ALU): Performs arithmetic and logical operations on two values.

Peripheral Devices

• Two types of peripherals are identified:

• Input Peripherals: Such as keyboards and mice, used to input information into the system.

• Output Peripherals: Such as monitors, which display information from the system.

Central Processing Unit (CPU)

• The CPU combines both control unit functions and ALU capabilities, executing stored program instructions from memory.

• It contains registers that provide high-speed storage for data being processed.

Memory Types

• RAM (Random Access Memory): Volatile memory allowing both read and write operations; data is lost when power is off.

• ROM (Read Only Memory): Non-volatile memory that retains data without power but only allows reading.

Addressing in Memory

• Each memory cell has a unique address for reading/writing operations; an example with eight addresses starting from zero is provided.

Buses in Computer Systems

• Three types of buses are discussed:

• Data Bus: Transfers actual data between components.

• Address Bus: Used by the CPU to access specific memory locations.

• Control Bus: Carries commands indicating what operation will be performed next.

Control Elements within CPUs

• Three key control elements are highlighted:

• Decoder: Interprets instructions for execution.

• Sequencer: Ensures proper execution order of instructions in registers.

• Clock Signal Generator: Synchronizes operations within the microprocessor.

Register Functions

• Various registers serve distinct purposes:

• The Program Counter keeps track of instruction addresses for execution sequence.

• Instruction Register holds currently executing instructions.

• General-purpose registers store operands involved in computations.

Microprocessor Operations

• Examples of microprocessor tasks include loading from memory, storing results back into memory, performing arithmetic operations like addition or subtraction, and halting execution with specific commands.

Understanding Instruction Execution in a Program

Instruction Loading and Execution Process

• The process begins with the instruction address being read and transferred from the instruction register to the decoder, which deciphers the operation to be executed.

• The first operation involves loading a value of 4 into the input register, while simultaneously incrementing the program counter by 1 to prepare for the next operation.

• The second instruction is also read and executed similarly; it stores a value of 2 in the second register after increasing the program counter again.

• The third instruction performs an addition of values (1 + 2), storing the result in another designated memory location, demonstrating arithmetic operations within programming logic.

• Following this, instructions are encoded and executed sequentially; one such instruction indicates that a value should be stored at a specific memory address, which was previously empty.

Finalization of Program Execution

• Upon completion of all instructions, including summing two values (4 and 2), all registers are cleared for initializing a new program cycle.