Samsung S5PC110 Manual page 1388

S5PC110_UM 5 4BG3D
5.1.5.3 Pixel Data Master
The PDM initiates "rasterize processing" within the system. It consists of the ISP and Pixel Presenter (PP)
modules. Each pixel pipeline processes pixels for a different half of a given tile, which allows for optimum
efficiency within each pipe due to locality of data.
5.1.5.4 VDM Data Master
The VDM initiates "transform and lighting processing" within the system. The VDM module reads an input control
stream, which contains triangle index data and state data. The state data indicates the PDS program, size of the
vertices, and amount of USSE output buffer resource available to the VDM. The triangle data is parsed to
determine unique indices that must be processed by the USSE. These are grouped together according to the
configuration provided by the driver and presented to the DMS.
5.1.5.5 General Purpose Data Master
The GPDM responds to events within the system. Each event causes an interrupt to the host or synchronized
execution of a program on the PDS. The program may or may not cause a subsequent task to be executed on the
USSE.
5.1.5.6 PDS
The DMS and PDS controls whether vertices, pixels, or imaging data operations are processed by the USSE. It
controls the order, location, and size of these operations. It also controls two operations: fetching essential data
for the USSE and allocating resources.
5.1.5.7 USSE
USSE is a user programmable processing unit. Although general in nature, its instructions and features are
optimized for three types of tasks, namely, processing vertices (vertex shading), processing pixels (pixel shading),
and imaging processing.
5.1.5.8 Multi-Level Cache
The multi-level cache is a level cache consisting of two modules, namely, the Main Cache and the Mux, Arbiter,
Demux, De-Compression Unit (MADD).
MADD is a wrapper around the main cache module that manages and formats requests to and from the cache. It
also provides Level 0 caching for texture and USSE requests.
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