
Introduction
14
Intel
82845G/82845GL/82845GV GMCH Datasheet
1.2
Related Documents
NOTE:
For additional related documents, refer to the
Intel
Pentium
4 Processor in 478-Pin Package and
Intel
845G/845GL/845GV Chipset Platform Design Guide
.
Graphics Core
The internal graphics related logic in the GMCH. Also known as the Integrated Graphics
Device (IGD).
HI
Hub Interface. The proprietary hub interconnect that ties the GMCH to the ICH4. In this
document HI cycles originating from or destined for the primary PCI interface on the ICH4
are generally referred to as HI/PCI or simply HI cycles.
Host
Intel
ICH4
This term is used synonymously with processor or CPU.
Fourth generation I/O Controller Hub component.
IGD
Integrated Graphics Device. Graphics device integrated into the GMCH.
LVTTL
Low Voltage TTL 3.3 V (SDR).
Primary PCI
The physical PCI bus that is driven directly by the ICH4 component. Communication
between the PCI and the GMCH occurs over the hub interface. Note that even though the
Primary PCI bus is referred to as PCI, it is not PCI Bus #0 from a configuration standpoint.
PSB
Processor System Bus. This is the bus between the GMCH and processor (also referred
to as the Host, FSB, or processor bus).
Scalable Bus
Processor-to-GMCH interface. The Compatible Mode of the Scalable Bus is the P6 bus.
The Enhanced Mode of the Scalable Bus is the P6 Bus plus enhancements primarily
consisting of source synchronous transfers for address and data, and PSB interrupt
delivery. The Intel
Pentium 4 processor implements a subset of Enhanced Mode.
SDR
Single Data Rate SDRAM.
SDRAM
Synchronous Dynamic Random Access Memory.
Secondary PCI
The physical PCI interface that is a subset of the AGP bus driven directly by the GMCH. It
supports a subset of 32-bit, 66 MHz
PCI Local Bus Specification, Revision 2.1
-compliant
components, but only at 1.5 V (not 3.3 V or 5 V).
SSTL_2
Stub Series Terminated Logic for 2.5 V (DDR).
Document
Document Number/ Location
Intel
Pentium
4 Processor in 478-Pin Package and Intel
845G/845GL/
82845GV Chipset Platform Design Guide
298654
Intel
845G/845GL/845GV Chipset Thermal Design Guide
298655
Intel
82801DB I/O Controller Hub 4 (ICH4) Datasheet
290744
Intel
Pentium
4 Processor in the 478-Pin Package Datasheet
249887
JEDEC Double Data Rate (DDR) SDRAM Specification
www.jedec.org
Intel
PC SDRAM Specification
http://developer.intel.com/
technology/memory/pcsdram/
spec/index.htm
Accelerated Graphics Port Interface Specification, Revision 2.0
http://www.intel.com/technology/
agp/agp_index.htm
Digital Visual Interface (DVI) Specification, Revision 1.0
Term
Description