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Intel
®
82854 Graphics Memory Controller Hub (GMCH)
126 D15343-003
6.4 Integrated Graphics Overview
The Intel
®
82854 GMCH provides a highly integrated graphics accelerator and PCI set while
allowing a flexible Integrated System Graphics solution.
High bandwidth access to data is provided through the system memory port. The GMCH uses a
tiling architecture to minimize page miss latencies and thus maximize effective rendering
bandwidth.
6.4.1 3D/2D Instruction Processing
The GMCH contains an extensive set of instructions that control various functions including 3D
rendering, BLT operations, display, MPEG decode acceleration, and overlay. The 3D instructions
set 3D pipeline states and control the processing functions. The 2D instructions provide an efficient
method for invoking BLT operations.
Figure 7. Intel
®
82854 GMCH Graphics Block Diagram (Native Graphic Mode only)
Pipe A
Instr./
Data
Setup/Transform
3D Engine
Scan Conversion
Texture Engine
Raster Engine
2D Engine
Video Engine
(MPEG2 Decode)
Overlay
Primary
Display
Display C
2
nd
Overlay
Alpha
Blend/
Gamma/
CRC
Cntl
Mux
Port
DAC
DVOB
DVOC
Memory Control
DDR/SDRAM