User`s manual

CZGA LX-50 CyberResearch

CPU Cards

2.4.4 AMD Geode™ LX 800 Graphics processor

The AMD Geode™ LX 800 BitBLT/vector engine graphics processor supports pattern

generation, source expansion, pattern/source transparency, 256 ternary raster operations,

alpha blenders to support alpha- BLTs, incorporated BLT FIFOs, a GeodeLink interface

and the ability to throttle BLTs according to video timing. New features added to the

Graphics Processor include:

 Command buffer interface

 Hardware accelerated rotation BLTs

 Color depth conversion

 Paletized color

 Full 8x8 color pattern buffer

 Separate base addresses for all channels

 Monochrome inversion

Table 2-1: Geode LX Graphics Features lists a complete list of Geode LX graphics

features. For more details, please refer to the AMD website or the Geode LX series data

book available from AMD.

Feature AMD Geode™ LX Processor

Color Depth 8, 16, 32 bpp (A) RGB 4 and 8-bit indexed

ROPs 256 (2-src, dest and pattern)

BLT Buffers FIFOs in Graphics Processor

BLT Splitting Managed by hardware

Video Synchronized BLT/Vector Throttle by VBLANK

Bresenham Lines Yes

Patterned (stippled) Lines Yes

Screen to Screen BLT Yes

Screen to Screen BLT with mono expansion Yes

Memory to Screen BLT Yes (throttled rep movs writes)

Accelerated Text No

Pattern Size (Mono) 8x8 pixels

Pattern Size (Color) 8x8 pixels