Introduction
R
Intel
®
82925X/82925XE MCH Datasheet 15
1.1 Terminology
Term Description
Core
Core refers to the internal base logic in the MCH.
DBI
Dynamic Bus Inversion.
DDR2
A second generation Double Data Rate SDRAM memory technology.
DMI
The Direct Media Interface is the connection between the MCH and the Intel
®
ICH6.
FSB
Front Side Bus. The FSB is synonymous with Host or processor bus
Full Reset
Full reset is when PWROK is de-asserted. Warm reset is when both RSTIN# and
PWROK are asserted.
Host
This term is used synonymously with processor.
INTx
An interrupt request signal where X stands for interrupts A,B,C and D.
Intel
®
ICH6
Sixth generation I/O Controller Hub component that contains additional functionality
compared to previous ICH6s. The Intel
®
I/O Controller Hub component contains the
primary PCI interface, LPC interface, USB2, ATA-100, and other I/O functions. It
communicates with the MCH over a proprietary interconnect called DMI.
MCH
The Memory Controller Hub (MCH) component contains the processor interface and
DRAM controller. It may also contain an x16 PCI Express port (typically the external
graphics interface). It communicates with the I/O controller hub (ICH6*) and other I/O
controller hubs over the DMI interconnect.
MSI
Message Signaled Interrupt. A transaction initiated outside the host, conveying interrupt
information to the receiving agent through the same path that normally carries read and
write commands.
PCI Express*
Third Generation Input Output (PCI Express) Graphics Attach called PCI Express
Graphics. A high-speed serial interface whose configuration is software compatible with
the existing PCI specifications. The specific PCI Express implementation intended for
connecting the MCH to an external graphics controller is a x16 link and replaces AGP.
Primary PCI
The physical PCI bus that is driven directly by the ICH6 component. Communication
between Primary PCI and the MCH occurs over DMI. Note that the Primary PCI bus is
not PCI Bus 0 from a configuration standpoint.
SCI
System Control Interrupt. SCI is used in ACPI protocol.
SERR
An indication that an unrecoverable error has occurred on an I/O bus.
SMI
System Management Interrupt. SMI is used to indicate any of several system conditions
(such as thermal sensor events, throttling activated, access to System Management
RAM, chassis open, or other system state related activity).
Rank
A unit of DRAM corresponding to eight x8 SDRAM devices in parallel or four x16
SDRAM devices in parallel, ignoring ECC. These devices are usually, but not always,
mounted on a single side of a DIMM.
TOLM
Top Of Low Memory. The highest address below 4 GB for which a processor-initiated
memory read or write transaction will create a corresponding cycle to DRAM on the
memory interface.
VCO
Voltage Controlled Oscillator.
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