Intel N475 AU80610006240AA User Manual
Product codes
AU80610006240AA
Functional Description
30
Datasheet
The GMCH supports sub-picture for DVD and DBS by mixing the two video streams via
alpha blending. Unlike color keying, alpha blending provides a softer effect and each
pixel that is displayed is a composite between the two video stream pixels. The GPU
can utilize four methods when dealing with sub-pictures. The flexibility enables the GPU
to work with all sub-picture formats.
alpha blending. Unlike color keying, alpha blending provides a softer effect and each
pixel that is displayed is a composite between the two video stream pixels. The GPU
can utilize four methods when dealing with sub-pictures. The flexibility enables the GPU
to work with all sub-picture formats.
3.2.3
2D Engine
3.2.3.1
VGA Registers
The 2D registers are a combination of registers defined for the original Video Graphics
Array (VGA) and others that Intel has added to support graphics modes that have color
depths, resolutions, and hardware acceleration features that go beyond the original
VGA standard.
Array (VGA) and others that Intel has added to support graphics modes that have color
depths, resolutions, and hardware acceleration features that go beyond the original
VGA standard.
3.2.3.2
Logical 128-Bit Fixed BLT and 256 Fill Engine
Use of this BLT engine accelerates the Graphical User Interface (GUI) of Microsoft
Windows* operating systems. The 128-bit BLT Engine provides hardware acceleration
of block transfers of pixel data for many common Windows operations. The term BLT
refers to a block transfer of pixel data between memory locations. The BLT engine can
be used for the following:
Windows* operating systems. The 128-bit BLT Engine provides hardware acceleration
of block transfers of pixel data for many common Windows operations. The term BLT
refers to a block transfer of pixel data between memory locations. The BLT engine can
be used for the following:
•
Move rectangular blocks of data between memory locations
•
Data Alignment
•
Perform logical operations (raster ops)
The rectangular block of data does not change as it is transferred between memory
locations. The allowable memory transfers are between: cacheable system memory
and frame buffer memory, frame buffer memory and frame buffer memory, and within
system memory. Data to be transferred can consist of regions of memory, patterns, or
solid color fills. A pattern will always be 8x8 pixels wide and may be 8, 16, or 32 bits
per pixel.
locations. The allowable memory transfers are between: cacheable system memory
and frame buffer memory, frame buffer memory and frame buffer memory, and within
system memory. Data to be transferred can consist of regions of memory, patterns, or
solid color fills. A pattern will always be 8x8 pixels wide and may be 8, 16, or 32 bits
per pixel.
The BLT engine has the ability to expand monochrome data into a color depth of 8, 16,
or 32 bits. BLTs can be either opaque or transparent. Opaque transfers move the data
specified to the destination. Transparent transfers compare destination color to source
color and write according to the mode of transparency selected.
or 32 bits. BLTs can be either opaque or transparent. Opaque transfers move the data
specified to the destination. Transparent transfers compare destination color to source
color and write according to the mode of transparency selected.
Data is horizontally and vertically aligned at the destination. If the destination for the
BLT overlaps with the source memory location, the graphics controller can specify
which area in memory to begin the BLT transfer. Hardware is included for all 256 raster
operations (Source, Pattern, and Destination) defined by Microsoft, including
transparent BLT.
BLT overlaps with the source memory location, the graphics controller can specify
which area in memory to begin the BLT transfer. Hardware is included for all 256 raster
operations (Source, Pattern, and Destination) defined by Microsoft, including
transparent BLT.
The graphics controller has instructions to invoke BLT and stretch BLT operations,
permitting software to set up instruction buffers and use batch processing. The
graphics controller can perform hardware clipping during BLTs.
permitting software to set up instruction buffers and use batch processing. The
graphics controller can perform hardware clipping during BLTs.