Intel 815 Manuel D’Utilisation
Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0
R
15
1. Introduction
The Intel
â
815 chipset is a highly flexible chipset designed to extend from the basic graphics/multimedia
PC platform up to the mainstream performance desktop platform. The chipset consists of an Intel
®
82815
chipset Graphics and Memory Controller Hub (GMCH), an I/O Controller Hub (ICH) for the I/O
subsystem, and a Firmware* Hub (FWH). For this chipset, the graphics capability resides in the Graphics
and Memory Controller Hub (GMCH) chip.
subsystem, and a Firmware* Hub (FWH). For this chipset, the graphics capability resides in the Graphics
and Memory Controller Hub (GMCH) chip.
The GMCH’s Graphics Controller (GC) contains an extensive set of registers and instructions for
configuration, 2D, 3D, and Video systems. This document describes the Intel
configuration, 2D, 3D, and Video systems. This document describes the Intel
®
815 chipset
registers/instructions and provides detailed bit/field descriptions.
This Programmer’s Reference Manual (PRM) is intended for hardware, software, and Firmware*
designers who seek to implement or utilize the graphic functions of the Intel
designers who seek to implement or utilize the graphic functions of the Intel
â
815 chipset. Familiarity
with 2D and 3D graphics programming is assumed.
1.1. Terminology
Term Description
AGP Mode
The GMCH is using its capability to interface with and AGP card. The internal
graphics controller is disabled in this mode.
graphics controller is disabled in this mode.
GPA Card
Graphics Performance Accelerator Card. This is a new implementation which
allows local memory devices to be placed on a card that plugs into the AGP slot.
When an AGP card is not present, an GPA card can be added to improve
performance by acting as a display cache, for the Z-buffer only, of up to 4 MB.
The GPA card was previously known as the AIMM (Add-In Memory Module).
allows local memory devices to be placed on a card that plugs into the AGP slot.
When an AGP card is not present, an GPA card can be added to improve
performance by acting as a display cache, for the Z-buffer only, of up to 4 MB.
The GPA card was previously known as the AIMM (Add-In Memory Module).
CSI
Command Stream Interface (same as instruction stream interface)
GC Graphics
Controller
GFX Mode
The GMCH is using its internal graphics capability. This means that the ability to
interface with an AGP card is disabled.
interface with an AGP card is disabled.
GMCH
The Graphics and Memory Controller Hub component that contains the
functionality of an MCH plus an internal graphics controller.
functionality of an MCH plus an internal graphics controller.
Group 0 Protection (register)
As per the original IBM VGA specification, CRT Controller registers CR[0:7] can
be write-protected via CR11[bit 7]. In BIOS code, this write protection is set
following each mode change. Note that other group protection levels have no
current use and are not supported by the GC. Only Group 0 Protection is
supported.
be write-protected via CR11[bit 7]. In BIOS code, this write protection is set
following each mode change. Note that other group protection levels have no
current use and are not supported by the GC. Only Group 0 Protection is
supported.
Instruction
The GC has a set of graphics instructions. In some documents the term
“command” is used for instruction.
“command” is used for instruction.
IP Instruction
Parser
MBZ
Must Be Zero