Apollo Chipset; Graphics And Memory Controller Hub (82855Gme) - Eurotech Apollo User Manual

APOLLO user manual

APOLLO chipset

The APOLLO chipset is based on the Intel 82855GME graphics and memory controller
hub and 82801DB IO controller hub components. These are a derivative of the Intel
Centrino chipset that Intel have provided with additional life cycle support for use in
embedded applications.

Graphics and Memory Controller Hub (82855GME)

The 82855GME or Graphics and Memory Controller Hub (GMCH) contains four main
components:
•
A host interface to the Pentium M/Celeron M processor.
•
A system memory interface to DDR SDRAM.
•
A hub interface to the IO controller hub (ICH4).
•
Integrated Graphics Device.
The GMCH supports a single Pentium M or Celeron M processor with a front side bus
(FSB) frequency of 400MHz. See the
of processor options.
Memory interface
The memory interface on the APOLLO board provides support for one ECC or non-ECC
DDR (Double Data Rate) SDRAM 184-pin 2.5V unbuffered dual inline memory module
(DIMM). Speeds PC1600 (200MHz), PC2100 (266MHz) and PC2700 (333MHz) are
supported. The BIOS automatically reads the parameters of the inserted memory module
via its SPD (Serial Presence Device) and configures the memory interface accordingly.
No user interaction is required.
The memory controller logic supports aggressive Dynamic Row Power Down features to
help reduce power and supports Address and Control line Tri-stating when DDR SDRAM
is in an active power down or in self refresh state.
Integrated graphics device
The GMCH contains an integrated Intel Extreme graphics 2 video engine that provides a
wide range of display capabilities:
•
Integrated graphics accelerator for 3D and 2D graphics.
•
Dual independent pipe supporting multiple display modes.
•
Dedicated MPEG2 decode engine.
•
High bandwidth memory interface.
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Processor section on the previous page for details
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