Intel D2500 DF8064101055400 Data Sheet
Product codes
DF8064101055400
38
Datasheet - Volume 1 of 2
3.2.1.4.1
Multi Level Cache
The multi-level cache is a three-level cache system consisting of two modules, the main
cache module and a request management and formatting module. The request
management module also provides Level-0 caching for texture and unified shader core
requests.
The request management module can accept requests from the data scheduler, unified
shaders and texture modules. Arbitration is performed between the three data
streams, and the cache module also performs any texture decompression that may be
required.
3.2.2
2D Engine
3.2.2.1
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.
3.2.2.2
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:
•
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.
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.
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.