Service manual

Appendix C Functional Description C-7
C.1.6 Graphics and Imaging (Workstation Only)
The system unit takes advantage of UPA features to provide high performance UPA
graphics. An FBC ASIC provides acceleration for 2-D and 3-D imaging primitives
(see
FIGURE C-1).
The UPA graphics consist of the FBC ASIC, the FBRAM, RAMDAC, and associated
circuitry. The UPA graphics connect to the system unit through the UPA64S
expansion connector.
FBRAM is a standard DRAM that includes a multilevel cache. The FBC ASIC
permits a write-mostly interface. This feature, combined with the 3DRAM cache and
support for graphics operations, provides for a high performance frame buffer.
UPA graphics support the VESA standard for monitor control. UPA graphics also
support stereo video.
Configuration restrictions:
■ UPA graphics configuration are configured to operate the FBRAM interface at
66-MHz; single-buffer (SB), double-buffer plus Z (DBZ); or 75-MHz for the DBZ
speed-sort.
■ ZX is supported as an optional upgrade only.
C.1.6.1 Graphics Card Features
Features provided by the UPA graphics card include:
■ YCC-to-RGB color space conversion for faster video decompression
■ Contrast stretch support for imaging
■ Line doubling for interlaced video writes
■ Consecutive block prefetch for smart frame buffer reads
■ DDC2B monitor serial communication with EDID default resolution support in
the boot PROM
■ 3DRAM OpenGL stencil function (four planes) support
■ New RAMDAC support
■ Single-buffered high-resolution (2.5 Mpixels) supports the following screen
resolutions (DBZ graphics card only):
■ 1920 × 1360 pixel landscape mode (HDTV)
■ 1280 × 2048 pixel portrait mode (medical)
■ Buffer B addressing for stateless (dumb frame buffer) and video accesses
■ Simultaneous 8-bit and 24-bit visual support
■ Multiple hardware color maps