PCI Host Controller
Display Controller
Several arbitration schemes supported
Display Compression Technology (DCT) architecture
greatly reduces memory bandwidth consumption of
display refresh
Supports up to three PCI bus masters
Synchronous to CPU core
Supports a separate video buffer and data path to
enable video acceleration in Geode I/O companion
devices
Allows external PCI master accesses to main memory
concurrent with CPU accesses to L1 cache
Internal palette RAM for gamma correction
Virtual Systems Architecture Technology
Direct interface to Geode I/O companion devices for
CRT and TFT flat panel support eliminates the need for
an external RAMDAC
Innovative architecture allowing OS independent (soft-
ware) virtualization of hardware functions
Provides XpressGRAPHICS subsystem:
— High performance legacy VGA core compatibility
Hardware cursor
Supports up to 1280x1024x8 bpp and
1024x768x16 bpp
Note: Uses 2D Graphics Accelerator.
Provides 16-bit XpressAUDIO subsystem:
— 16-bit stereo FM synthesis
— OPL3 emulation
— Supports MPU-401 MIDI interface
— Hardware assist provided via Geode I/O companion
chip
XpressRAM Subsystem
SDRAM interface tightly coupled to CPU core and
graphics subsystem for maximum efficiency
64-Bit wide memory bus
Additional hardware functions can be supported as
needed
Support for:
— Two 168-pin unbuffered DIMMs
— Up to 16 simultaneously open banks
— 16-byte reads (burst length of two)
— Up to 256 MB total memory supported
2D Graphics Accelerator
Accelerates BitBLTs, line draw, text
Bresenham vector engine
Supports all 256 ROPs
Diverse Operating System Support
Microsoft’s Windows 2000, 9X, NT, and CE
Sun Microsystems’ Java
WindRiver Systems’ VxWorks
QNX Software Systems’ QNX
Linux
Supports transparent BLTs and page flipping for
Microsoft’s DirectDraw
Runs at core clock frequency
Full VGA and VESA mode support
Special "driver level” instructions utilize internal
scratchpad for enhanced performance
Revision 1.1
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