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2 System Board
Chip-Set
The PIIX4, PCI/ISA Bridge Chip (82371AB)
The universal host controller interface (UHCI) chip, known as PIIX4, is
encapsulated in a Ball Grid Array (BGA) package.
The PIIX4 chip is a multi-function PCI device implementing a PCI-to-ISA
bridge function, a PCI IDE function, a Universal Bus host/hub function, and
an Enhanced Power Management function.
The following figure shows an example of the system block diagram using
the PIIX4 chip.
Processor
Host-to-PCI
Bridge
Main Memory
DRAM
PCI/ISA Bridge (PIIX4)
82371AB
PCI Bus (3.3V or 5V, 30/33 MHz)
ISA/EIO Bus (3.3V; 5V Tolerant)
BIOS
Audio
SP, PP,
FDC, IR
KBD
PCI Slots
Host Bus
USB 1
USB2
GP[I,O] (30+)
SM Bus
Hard Disk
CD-ROM
BMI IDE
Ultra DMA/33
Second Level
Cache
AGP Bus
Cirrus AGP
CL5465
Memory Bus
Hard Disk