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Intel
®
82854 Graphics Memory Controller Hub (GMCH)
18 D15343-003
Intel 82801DBM ICH4-M The component contains the primary PCI interface, LPC interface, USB 2.0,
ATA-100, AC’97, and other I/O functions. It communicates with the Intel
®
82854
GMCH over a proprietary interconnect called the Hub interface. Throughout this
datasheet, the Intel 82801DBM ICH4-M component will be referred to as the
ICH4-M
IPI Inter Processor Interrupt
LCD Liquid Crystal Display
MSI Message Signaled Interrupts. MSI allow a device to request interrupt service via
a standard memory write transaction instead of through a hardware signal
Native Graphic Mode The Intel
®
82854 GMCH can support RGB and Dual Independent Display in this
mode
PWM Pulse Width Modulation
SD Standard definition, typically MP@ML for MPEG2
SSC Spread Spectrum Clocking
STB Set Top Box
System Bus Processor-to-Intel
®
82854 GMCH interface. The Enhanced mode of the
Scalable bus is the P6 Bus plus enhancements, consisting of source
synchronous transfers for address and data, and system bus interrupt delivery.
The Intel Celeron M processor implements a subset of Enhanced mode.
UMA Unified Memory Architecture with graphics memory for the IGD inside system
memory
VDL Video Data Link