©Richard L. Goldman 20011

Personal Computer System Board Architecture

©Richard Goldman

June 24, 2001

©Richard L. Goldman 20012

IDE 1IDE 2

RTCCMOS

COM 1COM 2

LPT 1FDD

Keyboard ROM BIOS

33MHz – 32bit

ISA8MHz – 16bit

PCI

South Bridge

North Bridge

Super IO

Main Memory

16MHz – 32bit EDO

CPUProcessor

L1L2

External Cache

66MHz – 64bit

P5 Class ProcessorPentium – Socket 7

©Richard L. Goldman 20013

CPUProcessor

L1

66MHz – 64bit

L2

North Bridge

33MHz – 32bit

IDE 1IDE 2

RTCCMOS

COM 1COM 2

LPT 1FDD

Keyboard ROM BIOS

ISA8MHz – 16bit

PCI

South Bridge

Super IO

Main Memory

16MHz-32bit EDO-SIMM

66MHz-64bit SDRAM-DIMM

P6 Class ProcessorPentium Pro – Socket 8

Backside Bus

Discrete Cache

Frontside Bus

©Richard L. Goldman 20014

Slot 1 Board

AGP

CPUProcessor

L1

USB

SystemMouse

66MHz – 32bit

66/100MHz – 64bit

66/100MHz – 64bit

L2

North Bridge

8MHz – 16bit

IDE 1IDE 2

RTCCMOS

COM 1COM 2

LPT 1FDD

Keyboard ROM BIOS

33MHz – 32bit

ISA

PCI

South Bridge

Super IO

Main Memory

P6 Class ProcessorPentium II – Slot 1

©Richard L. Goldman 20015

AGP

IDE 1IDE 2

USBRTC

CMOS

COM 1COM 2

LPT 1FDD

66MHz – 32bit

33MHz – 32bit

ISA8MHz – 16bit

PCI

South Bridge

North Bridge

Super IO

Main Memory

SystemMouse

Keyboard ROM BIOS

CPUProcessor

L1

100/133MHz – 64bit

100/133MHz – 64bit

L2

P6 Class ProcessorPentium III – Socket PGA-370 ATC – Advance Transfer Cache

©Richard L. Goldman 20016

Main MemoryRDRAM

400MHz-16bit-Channel 1

400MHz-16bit-Channel 2

CNR

USB4 ports

3.2GB/Sec (100MHz X 4 – 64bit)

IDEUDMA

100

FlashBIOS

AGP

66MHz(4X)-32bit

PCI 3233MHz-32bit

MemoryController

Hub

I/OController

Hub

Net Burst Class ProcessorPentium 4 (P4)Hub ArchitectureSocket PPGA 423

266MB/Sec

LAN

CPUProcessor

L1 L2

PCI 6466MHz

82866(P64H)

64bit

32bit

©Richard L. Goldman 20017

Net Burst System Bus Speed

Specification• 100MHz Clock Speed• 64 bit Bus• 4X (4 bits transferred per clock cycle)

Transfer Rate:• 100 MHz X 4 = 400MHz• 400MHz X 64bits = 25,600Mbits/Sec• 25,600Mbits/Sec / 8bits/Byte = 3,200MBytes/Sec or

3.2GBytes/Sec3.2GBytes/Sec