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2 System Board
Memory Controller Hub (8240)
Memory Controller Hub (8240)
The MCH Host Bridge/Controller is contained in a 544-pin Ball Grid Array
(BGA) package and is the bridge between the Host bus, Dual Rambus bus
(main memory), AGP 4x (graphic) bus, Hub Link 8-bit and Hub Link
16-bit.
The following figure shows an example of the system block diagram using
the MCH.
I840 Memory
Controller Hub (MCH)
82840-QP
Memory
Expansion Card
Connector
PCI Bus (64-bit, 66 MHz)
533 MB/s data transfer rate
Dual Rambus Bus
Address (36)
Control
Data (64)
AGP 4x Bus
(133 MHz (1 GB MB/s
data transfer rate)
Intel Pentium III
Processor
(optional second processor)
with L2 cache memory
SECC-2 cartridge
(533 MB/s data
transfer rate)
P64H
Onboard AIC7892
SCSI U160
Controller
HUB
LINK 16
HUB LINK 8
(266 MB/s data
transfer rate)
Slot 4 - 64-bit/66 MHz
Slot 3 - 64-bit/66 MHz
Intel Pentium III
Processor
with L2 cache memory
I/O Controller Hub
(ICH) 82801AA
(2.4 GB/s at 300 MHz or
3.2 GB/s at 400 MHz-
data transfer rate)
SECC-2 cartridge
AGP
Interface
PCI
Interface
Memory
Controller
Universal
AGP
PRO
Connector
Host (also called FSB) Bus
100/133 MHz, 1 GB/sec
data transfer rate)