Organização e Arquitetura de Computadores - Módulo 3

Understanding Computer Memory and I/O: A Comprehensive Guide

Dive into the core components that power your computer with this detailed exploration of computer memory and input/output (I/O) systems. This guide covers everything from the fundamental types of memory to how data moves in and out of your system.

1. Memory: The Heart of Your Computer

Explore the different levels of computer memory, understanding how they work together to enable efficient computing.

• Cache, RAM, and ROM: A breakdown of the key memory types and their roles.
• Cache Memory: Learn about cache and its importance in improving performance through temporal locality and spatial locality. We'll cover different cache mapping techniques:
  • Direct Mapping: A simple and efficient approach.
  • Associative Mapping: Offers flexibility in data placement.
  • Set-Associative Mapping: A balance between direct and associative mapping.
• RAM (Random Access Memory): Delve into the two main types of RAM:
  • DRAM (Dynamic RAM): The most common type of RAM.
  • SRAM (Static RAM): Faster but more expensive.
• ROM (Read-Only Memory): Discover the different types of ROM used for storing firmware and boot instructions:
  • PROM (Programmable ROM): Programmable once.
  • EPROM (Erasable Programmable ROM): Erasable with ultraviolet light.
  • EEPROM (Electrically Erasable Programmable ROM): Erasable electrically.
  • Flash ROM: A type of EEPROM commonly used in SSDs and USB drives.

2. Buses: Connecting the System

Understand how data travels between different components using computer buses.

• System Bus: Learn about the key components of the system bus: address lines, data lines, and control signals.
• Types of Buses: Explore various bus types used in modern computers:
  • Front Side Bus (FSB): (Historically significant, now largely replaced)
  • Memory Bus: Connects the CPU to RAM.
  • Video Bus: Connects the CPU to the graphics card.
  • Internal Bus: Connects components within the motherboard.
  • Expansion Bus: Connects expansion cards like sound cards and network cards.
• Northbridge and Southbridge: Understand the roles of these chipsets in managing communication between the CPU and peripherals.
• Bus Technologies: A comprehensive overview of different bus standards:
  • Serial Buses: Transmit data one bit at a time.
  • Parallel Buses: Transmit data multiple bits at a time.
  • IDE/ATA: Older interface for hard drives and optical drives.
  • SATA (Serial ATA): A modern interface for hard drives and SSDs.
  • SCSI (Small Computer System Interface): High-speed interface for servers.
  • SAS (Serial Attached SCSI): A modern version of SCSI.
  • PCI (Peripheral Component Interconnect): Older expansion bus standard.
  • AGP (Accelerated Graphics Port): Older interface for graphics cards.
  • PCI Express (PCIe): The current standard for high-speed expansion cards.
  • USB (Universal Serial Bus): A versatile interface for connecting a wide range of peripherals.

3. Secondary Memory: Long-Term Storage

Explore different types of secondary storage devices used for long-term data storage.

• Magnetic Disks: Understand the principles of data storage on magnetic disks.
  • Seek Time: The time it takes to position the read/write head.
  • Rotational Latency: The time it takes for the desired sector to rotate under the read/write head.
  • Transfer Rate: The speed at which data is transferred.
• Optical Disks: Learn about different types of optical disks:
  • CD (Compact Disc)
  • CD-ROM (Read-Only Memory CD)
  • CD-R (Recordable CD)
  • CD-RW (Rewritable CD)
  • DVD (Digital Versatile Disc)
  • DVD-R (Recordable DVD)
  • DVD-RW (Rewritable DVD)
  • **HD-DVD (High