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2 System Board
The Input/Output Controller Hub (82801AA)
The Input/Output Controller Hub (82801AA)
The ICH, is encapsulated in a 241-pin Ball Grid Array (BGA) package and
is located on the system board just underneath the Memory Expansion
Card Connector. It provides the interface between the PCI bridge (PCI
Rev. 2.2 compliant with support for 32-bit 33 MHz PCI operations),
PCI-to-LPC (Low Pin Count) bridge, IDE controller, USB controller,
SMBus controller and AC’97 controller.
The ICH functions and capabilities are discussed in detail later on in this
section. The following figure shows an example of the system block
diagram using the ICH.
LPC / FWH Link
I840 Memory
Controller Hub
(MCH)
82840-QP
Audio PCI
Chip
(CS4280)
I/O Controller Hub
(ICH) 82801AA
MaxiLife
Monitoring
Chip
Serial
EEPROM
SMBus
Address (36)
Control
Data (64)
ATA 66, 2 Channels
2 x USB
Controller
LCD
Status
Panel
Parallel and
Serial Ports
Keyboard,
Mouse and
Floppy
Slot 1 - 32-bit/33 MHz
Slot 2- 32-bit/33 MHz
Slot 5 - 32-bit/33 MHz
Host (also called FSB) two-
way Bus 100/133 MHz,
HUB LINK 8
(233 MB/s data
transfer rate)
2 IDE
Connectors
2 USB
Connectors
FirmWare
Hardware
(FWH) 82802
USB
Super I/O
NS 87364
SM Bus
Controller
Fans
PCI Bus (32-bit, 33 MHz)
133 MB/s data transfer rate
Codec
Audio AC‘97
MIDI
Port
AC ‘97
Digital
Link
Intel Pentium III
Processor
with L2 cache memory
I/O Controller Hub
(ICH) 82801AA
PCI Bridge
IDE
Controller
DMA
Controller