how motherboards work

NITC - kufranjah knowledge station - islam khatatbeh

Motherboards How Motherboards Work

IT Essentials: PC Hardware and Software v4.0

NITC - kufranjah knowledge station - islam khatatbeh ITE V4.0 Chapter 1 2

Motherboards • Introduction To Motherboards • Form Factor• Sockets and CPUs• Chipsets• Bus Speed• Memory • Motherboard Power Connector.• Slots And Ports On Motherboard.

http://computer.howstuffworks.com/motherboard.htm

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Motherboard• The motherboard is the main printed

circuit board and contains the buses, or electrical pathways, found in a computer.

These buses allow data to travel between the various components that comprise a

computer.• A motherboard is also known as the

system board, the backplane, or the main board.


Motherboard• The motherboard accommodates the

central processing unit (CPU), RAM, expansion slots, heat sink/fan assembly, BIOS chip, chip set, and the embedded wires that interconnect the motherboard components. Sockets, internal and external connectors, and various ports are also placed on the motherboard.


Motherboard

SpecificationsForm Factor: Micro ATX, uATXProcessor Socket: IntelProcessor Interface: LGA1156Processors Supported:

Intel Core i7 Intel Core i5


MotherboardSpecifications•Form Factor : ATX .

• Processor Socket: Intel

•Processor interface : socket 775

• Processors Supported: Intel Pentium D Intel Pentium EE Intel Core 2 Duo Intel Core 2 Extreme Intel Core 2 Quad Intel Pentium Dual Core Intel Penryn


Motherboards Form Factor

• The form factor of motherboards pertains to the size and shape of the board.

• It also describes the physical layout of the different components and devices on the motherboard.

• The form factor affects where individual components go and the shape of the computer's case. There are several specific form factors that most PC motherboards use so that they can all fit in standard cases.


Various Form Factors Exist For Motherboards

– AT – Advanced Technology– ATX – Advanced Technology Extended– Mini-ATX – Smaller footprint of ATX– Micro-ATX – Smaller footprint of ATX– LPX – Low-profile Extended– NLX – New Low-profile Extended– BTX – Balanced Technology Extended


Motherboards Form FactorThe form factor is just one of the many standards that apply to

motherboards. Some of the other standards include: • The socket for the microprocessor determines what kind of

Central Processing Unit (CPU) the motherboard uses. • The chipset is part of the motherboard's logic system and is usually

made of two parts -- the northbridge and the southbridge. These two "bridges" connect the CPU to other parts of the computer.

• The Basic Input/Output System (BIOS) chip controls the most basic functions of the computer and performs a self-test every time you turn it on. Some systems feature dual BIOS, which provides a backup in case one fails or in case of error during updating.

• The real time clock chip is a battery-operated chip that maintains basic settings and the system time.


Sockets and CPUs

Socket 775

LGA 1156 Socket


Sockets and CPUs• The central processing unit (CPU) is considered

the brain of the computer. It is sometimes referred to as the processor.

• Most calculations take place in the CPU. the CPU is the most important element of a computer system.

• CPUs come in different form factors, each style requiring a particular slot or socket on the motherboard. Common CPU manufacturers include Intel and AMD


Sockets and CPUs• The CPU socket or slot is the connector that interfaces

between the motherboard and the processor itself.• Most CPU sockets and processors in use today are

built around the pin grid array (PGA) architecture, in which the pins on the underside of the processor are inserted into the socket, usually with zero insertion force (ZIF).

• ZIF refers to the amount of force needed to install a CPU into the motherboard socket or slot. Slot-based processors are cartridge-shaped and fit into a slot that looks similar to an expansion slot.


Sockets and CPUs

Motherboard spcification : Form Factor: Micro ATX, uATXProcessor Socket: Intel Processor Interface: LGA1156 Processors Supported: Intel Core i7 Intel Core i5

LGA 1156 Socket


Sockets and CPUs

Motherboard spcification : •Form Factor : ATX .• Processor Socket: Intel •Processor interface : socket 775

Socket 775

Processors Supported: Intel Pentium D , Intel Pentium EE Intel Core 2 Duo, Intel Core 2 Extreme Intel Core 2 Quad , Intel Pentium Dual Core Intel Penryn


Sockets and CPUs

The Socket 370 processor socket, a ZIF type PGA socket

PGA 370 Processor

http://en.wikipedia.org/wiki/File:Intel_Socket_370.JPG


Sockets and CPUs• The newest Intel CPU does not have a PGA. It has an

LGA. • LGA stands for Land Grid Array. An LGA is different from

a PGA in that the pins are actually part of the socket, not the CPU.

• Anyone who already has a specific CPU in mind should select a motherboard based on that CPU. For example, if you want to use one of the new multi-core chips made by Intel or AMD, you will need to select a motherboard with the correct socket for those chips. CPUs simply will not fit into sockets that don't match their PGA.

• The CPU communicates with other elements of the motherboard through a chipset. We'll look at the chipset in more detail next

False


Chipsets• An important set of

components on the motherboard ,The chip set is composed of various integrated circuits attached to the motherboard that control how system hardware interacts with the CPU and motherboard.

Intel x58 chipest


Chipsets• The chip set of a motherboard allows the CPU to

communicate and interact with the other components of the computer, and to exchange data with system memory, or RAM, hard disk drives, video cards, and other output devices.

• The chip set establishes how much memory can be added to a motherboard. The chip set also determines the type of connectors on the motherboard.

• Most chip sets are divided into two distinct components, Northbridge and Southbridge.

• Northbridge controls access to the RAM, video card, and the speeds at which the CPU can communicate with them. The video card is sometimes integrated into the Northbridge.

• Southbridge, in most cases, allows the CPU to communicate with the hard drives, sound card, USB ports, and other I/O ports.


Northbridge, Southbridge • The northbridge connects directly to the processor via the front side

bus (FSB). A memory controller is located on the northbridge, which gives the CPU fast access to the memory. The northbridge also connects to the AGP or PCI Express bus and to the memory itself.

• The southbridge is slower than the northbridge, and information from the CPU has to go through the northbridge before reaching the southbridge. Other busses connect the southbridge to the PCI bus, the USB ports and the IDE or SATA hard disk connections .

• Chipset selection and CPU selection go hand in hand, because manufacturers optimize chipsets to work with specific CPUs.

• The chipset is an integrated part of the motherboard, so it cannot be removed or upgraded. This means that not only must the motherboard's socket fit the CPU, the motherboard's chipset must work optimally with the CPU.


Northbridge Southbridge Front side

bus ( FSB )

Memory Slot

Memory Bus

PCI BusPCI slots

High speed graphic bus

)AGP,PCI express(


Bus Speed• A bus is simply a circuit that connects one

part of the motherboard to another. The more data a bus can handle at one time, the faster it allows information to travel. The speed of the bus, measured in megahertz (MHz).


Busses Found On Motherboard

front side bus (FSB), back side bus .The memory bus The IDE or ATA bus connects The AGP bus connects The PCI bus connects


Busses Found On Motherboard• front side bus (FSB) OR CPU Bus is the bus that

carries data between the CPU and the northbridge.• Depending on the processor used, some computers

may also have a back-side bus that connects the CPU to the cache. This bus and the cache connected to it are faster than accessing the system memory via the front side bus.

• The amount of data that a CPU can process at the one time depends on the size of the front side bus (FSB). The wider the processor data bus width, the more powerful the processor is. Current processors have a 32-bit or a 64-bit processor data bus.


Busses Found On Motherboard• back side bus connects the CPU with the level

2 (L2) cache, also known as secondary or external cache. The processor determines the speed of the back side bus.

• memory bus connects the northbridge to the memory.

• IDE or ATA bus connects the southbridge to the disk drives.

• AGP bus connects the video card to the memory and the CPU. The speed of the AGP bus is usually 66 MHz.


Busses Found On Motherboard• The PCI bus connects PCI slots to the

southbridge. On most systems, the speed of the PCI bus is 33 MHz. Also compatible with PCI is PCI Express, which is much faster than PCI but is still compatible with current software and operating systems. PCI Express is likely to replace both PCI and AGP busses.

• The faster a computer's bus speed, the faster it will operate, A fast bus speed cannot make up for a slow processor or chipset.


Memory• The speed of the chipset and busses controls how

quickly it can communicate with other parts of the computer. The speed of the RAM connection directly controls how fast the computer can access instructions and data, and therefore has a big effect on system performance. A fast processor with slow RAM is going nowhere.

• The amount of memory available also controls how much data the computer can have readily available. RAM makes up the bulk of a computer's memory. The general rule of thumb is the more RAM the computer has, the better.


Memory• Much of the memory available today is dual

data rate (DDR) memory. This means that the memory can transmit data twice per cycle instead of once, which makes the memory faster. Also, most motherboards have space for multiple memory chips, and on newer motherboards, they often connect to the northbridge via a dual bus instead of a single bus. This further reduces the amount of time it takes for the processor to get information from the memory.


Memory• A motherboard's memory slots directly

affect what kind and how much memory is supported. Just like other components, the memory plugs into the slot via a series of pins. The memory module must have the right number of pins to fit into the slot on the motherboard.


Slots And Ports On Motherboard • Peripheral Component Interconnect (PCI)- is 32-bit or

64-bit expansion slot , PCI is standard slot currently used in most computer, connections for video, sound and video capture cards, network cards.

• Accelerated Graphics Port (AGP) - is 32-bit expansion slot , AGP is designed for video card .

• Integrated Drive Electronics (IDE) - interfaces for the hard drives , IDE, also called Advanced Technology Attachment (ATA) is an early drive controller interface that connects computers and hard disk drives. An IDE interface uses a 40-pin connector.

• Memory slots .


Slots And Ports On Motherboard • PCI Express Peripheral Component Interconnect

Express), is a computer expansion card standard designed to replace the older PCI, and AGP standards. Introduced by Intel in 2004, PCIe is the latest standard for expansion cards, express is backward compatible with PCI slot , PCI-express has x1,x4,x8,x16 slot .

• serial ATA, or SATA computer bus, is a storage-interface for connecting host bus adapters to mass storage devices such as hard disk drives and optical drives. The SATA host adapter is integrated into almost all modern consumer laptop computers and desktop motherboards.


Slots And Ports On Motherboard • parallel port on a computer is a standard Type A DB-25

female connector .• SCSI port can transmit data at rates in excess of 320

Mbps and can support up to 15 devices. • USB Ports and Cables

The Universal Serial Bus (USB) is a standard interface that connects peripheral devices to a computer. It was originally designed to replace serial and parallel connections.

• serial port can be either a DB-9, or a DB-25 male connector. Serial ports transmit one bit of data at a time. To connect a serial device, such as a modem or printer.

• FireWire Ports .FireWire is a high-speed, hot-swappable interface that connects peripheral devices to a computer.


Slots And Ports On Motherboard • network port, also known as an RJ-45 port, connects

a computer to a network. • PS/2 port connects a keyboard or a mouse to a

computer. The PS/2 port is a 6-pin mini-DIN female connector. The connectors for the keyboard and mouse are often colored differently .

• Audio PortsAn audio port connects audio devices to the computer .

• Video Ports and ConnectorsA video port connects a monitor cable to a compute

• Gameport/MIDI – Connects to a joystick or MIDI-interfaced device


Slots And Ports On Motherboard Type Of Video Ports and Connectors• Video Graphics Array (VGA) – VGA has a 3-row 15-pin

female connector and provides analog output to a monitor. • Digital Visual Interface (DVI) – DVI has a 24-pin female

connector or a 29-pin female connector and provides a compressed digital output to a monitor. DVI-I provides both analog and digital signals. DVI-D provides digital signals only.

• High-Definition Multimedia Interface (HDMi) – HDMi has a 19-pin connector and provides digital video and digital audio signals.

• S-Video – S-Video has a 4-pin connector and provides analog video signals.

• Component/RGB – RGB has three shielded cables (red, green, blue) with RCA jacks and provides analog video signals.


Slots And Ports On Motherboard

• PCI Express slots (from top to bottom: x4 , x16, x1 and x16), compared to a traditional 32-bit PCI slot (bottom).

PCI slot

PCI Express

slots



• Peripheral Component Interconnect (PCI)- is 32-bit or 64-bit expansion slot , PCI is standard slot currently used in most computer, connections for video, sound and video capture cards, network cards…

PCI slots



AGP slot

Accelerated Graphics Port (AGP) - is 32-bit expansion slot , AGP is designed for video card.



Parallel ATA (PATA) is an interface standard for the connection of storage devices such as hard disks, and CD-ROM drives in computers. An IDE interface uses a 40-pin connector.

Parallel ATA

(PATA)



First-generation (1.5 Gbit/s) SATA

ports on a motherboard

SATA – Serial ATA refers to the serial version of the ATA drive controller interface. A SATA interface uses a 7-pin connector


SDRAM DIMM slots

Dual inline memory module ( DIMM) is a circuit board that hold SDRAM,DDR SDRAM and DDR2 SDRAM CHIPS there are 168-pin SDRAM Dimm and 184-pin DDR SDRAM Dimms ,and 240-pin DDR2 SDRAM Dimms

Memory SlotsSlots And Ports On Motherboard


Slots And Ports On MotherboardMemory Slots

Ram bus inline memory module ( RIMM) is a circuit board that hold RDRAM CHIPS a typical RIMM has 184-pin configuration .



DIMM Slots using Dual Channel 240-pin DDR2 with a total capacity of up to 8GB-64bit. You can install DDR2 533/667/800MHz Memory.

Memory Slots



4 DDR3 Memory Slot

Memory Type: DDR3 Memory Supported : 2000MHZ DDR3

1600MHZ DDR3

Memory Slots


Motherboard Power Connector

Modern motherboards with socket 775 cpus get their input voltage from a 24-pin ATX12 connector. This is the only way to obtain the necessary power required.



An additional connector for a 12-Volt supplementary input voltage for the motherboard is provided



8- pin AUX power connector found on the motherboard

AUX power connector



Firewire Cable

FireWire is a high-speed, hot-swappable interface that connects peripheral devices to a computer. A single FireWire port in a computer can support up to 63 devices. Some devices can also be powered through the FireWire port, eliminating the need for an external power source. FireWire uses the IEEE 1394 standard and is also known as i.Link.

Firewire PORT



Parallel port

Parallel ports can transmit 8 bits of data at one time and use the IEEE 1284 standard. To connect a parallel device, such as a printer.



SCSI port

A SCSI port can transmit data at rates in excess of 320 Mbps and can support up to 15 devices.

NOTE : Some SCSI connectors resemble parallel connectors. Be careful not to connect the cable to the wrong port

SCSI port -BD 25 PIN

SCSI port -BD 50 PIN

CN50 - 50 pin Centronics



The Universal Serial Bus (USB) is a standard interface that connects peripheral devices to a computer. It was originally designed to replace serial and parallel connections. A USB hub is used to connect multiple USB devices. A single USB port in a computer can support up to 127 separate devices with the use of multiple USB hubs .USB 1.1 allowed transmission rates of up to 12 Mbps in full-speed mode and 1.5 Mbps in low speed mode. USB 2.0 allows transmission speeds up to 480 Mbps. USB devices can only transfer data up to the maximum speed allowed by the specific port.

USB port



serial port

serial port can be either a DB-9, or a DB-25 male connector. Serial ports transmit one bit of data at a time. To connect a serial device, such as a modem or printer.



Network port

RJ 45

network port, also known as an RJ-45 port, connects a computer to a network. The connection speed depends on the type of network port. Standard Ethernet can transmit up to 10 Mbps, Fast Ethernet can transmit up to 100 Mbps, and Gigabit Ethernet can transmit up to 1000 Mbps .



PS/2 port

PS/2 port connects a keyboard or a mouse to a computer. The PS/2 port is a 6-pin mini-DIN female connector. The connectors for the keyboard and mouse are often colored differently .



Audio Ports

An audio port connects audio devices to the computer. The following audio ports are commonly used : Line In – Connects to an external source, such as a stereo system Microphone – Connects to a microphone Line Out – Connects to speakers or headphones


Slots And Ports On MotherboardDVI port

Digital Visual Interface (DVI) – DVI has a 24-pin female connector or a 29-pin female connector and provides a compressed digital output to a monitor. DVI-I provides both analog and digital signals. DVI-D provides digital signals only.



AVG port

Video Graphics Array (VGA) – VGA has a 3-row 15-pin female connector and provides analog output to a monitor .



HDMI PORT

High-Definition Multimedia Interface (HDMi) – HDMi has a 19-pin connector and provides digital video and digital audio signals.



S-VIDEO PORT

S-Video – S-Video has a 4-pin connector and provides analog video signals



RCA jacks

Component/RGB – RGB has three shielded cables (red, green, blue) with RCA jacks and provides analog video signals.


Ports On Motherboard


EVGA P55 Motherboard

Specifications Form Factor: ATX Processor Socket: Intel Processor Interface: LGA1156 Processors Supported:Intel Core i7 Intel Core i5 Northbridge: Intel P55 express Number of Slots: 4 Number of Pins: 240-Pin Maximum Memory Supported: 4GB -

32bit , 16GB - 64bit Memory Type: DDR3 MemorySupported: 1066MHz DDR3 1333MHz DDR3 1600MHz DDR3 2200+ MHz DDR3



Specifications Max. Memory Supported Per Slot: 4GB LAN Type: 10/100/1000Mbps Gigabit PCI Express X16 Slots: 1 - (PCIe 2.0) 2 - (PCIe 2.0 x8 mode) PS/2 Keyboard Connectors: 1 USB Ports: 12 USB Rear Panel Ports: 6 USB Onboard Headers: 3 - (expandable to 6

USB ports) FireWire Ports: 1 LAN Ports: 2 Serial ATA 3.0Gb/s Headers: 6, 2-External ATX Power Connectors: 1 PC Power Connectors: 2 - 8 Pin

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