2. ©Richard L. Goldman 2001 1 Personal Computer System Board Architecture ©Richard Goldman June 24, 2001

3. ©Richard L. Goldman 2001 2 IDE 1IDE 2 RTC CMOS COM 1COM 2LPT 1FDD KeyboardROM BIOS 33MHz – 32bit ISA 8MHz – 16bit PCI South BridgeNorth BridgeSuper IO Main Memory 16MHz – 32bit EDO CPU Processor L1 L2 External Cache 66MHz – 64bit P5 Class Processor Pentium – Socket 7

4. ©Richard L. Goldman 2001 3 CPU Processor L1 66MHz – 64bit L2 North Bridge 33MHz – 32bit IDE 1 IDE 2 RTC CMOS COM 1 COM 2 LPT 1 FDD KeyboardROM BIOS ISA 8MHz – 16bit PCI South Bridge Super IO Main Memory 16MHz-32bit EDO-SIMM 66MHz-64bit SDRAM-DIMM P6 Class Processor Pentium Pro – Socket 8 Backside Bus Discrete Cache Frontside Bus

5. ©Richard L. Goldman 2001 4 Slot 1 Board AGP CPU Processor L1 USB System Mouse 66MHz – 32bit 66/100MHz – 64bit L2 North Bridge 8MHz – 16bit IDE 1 IDE 2 RTC CMOS COM 1 COM 2 LPT 1 FDD KeyboardROM BIOS 33MHz – 32bit ISA PCI South Bridge Super IO Main Memory P6 Class Processor Pentium II – Slot 1

6. ©Richard L. Goldman 2001 5 AGP IDE 1 IDE 2 USB RTC CMOS COM 1 COM 2 LPT 1 FDD 66MHz – 32bit 33MHz – 32bit ISA 8MHz – 16bit PCI South Bridge North Bridge Super IO Main Memory System Mouse KeyboardROM BIOS CPU Processor L1 100/133MHz – 64bit L2 P6 Class Processor Pentium III – Socket PGA-370 ATC – Advance Transfer Cache

7. ©Richard L. Goldman 2001 6 Main Memory RDRAM 400MHz-16bit-Channel 1 400MHz-16bit-Channel 2 CNR USB 4 ports 3.2GB/Sec (100MHz X 4 – 64bit)100MHz X 4 – 64bit IDE UDMA 100 Flash BIOS AGP 66MHz(4X)-32bit PCI 32 33MHz-32bit Memory Controller Hub I/O Controller Hub Net Burst Class Processor Pentium 4 (P4) Hub Architecture Socket PPGA 423 266MB/Sec LAN CPU Processor L1L2 PCI 64 66MHz 82866 (P64H) 64bit 32bit

8. ©Richard L. Goldman 2001 7 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 3.2GBytes/Sec25,600Mbits/Sec / 8bits/Byte = 3,200MBytes/Sec or 3.2GBytes/Sec