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2.3.2.
Intel 855GME Chipset Graphics Memory Controller Hub
(GMCH)
All chipset and graphics features of Intel 855GM chipset GMCH is supported in Intel 855GME chipset
GMCH. This section lists the additional enhancements.
• Integrated System Memory DRAM controller
Supports up to two double-sided SO-DIMMs (four rows populated) with unbuffered
PC1600/PC2100/PC2700 DDR-SDRAM (ECC is not supported)
Support for memory self refresh in C3
• Integrated graphics core frequency
Display / Render Core frequency up to 250 MHz
• Integrated graphics engine
Frame Buffer Compression
Bi-Cubic Filtering supported
Video Mixer Rendering support
Linear Gamma Blending for VMR
• Backlight Image Adaptation Technology
Allows image enhancement by direct control of the backlight inverter through the PWM signal
• Package/Power
VCC, VCCASM, VCCHL, VCCAHPLL, VCCAGPLL, VCCADPLLA, VCCADPLLB (1.35V)
2.3.2.1.
Accelerated Graphics Port (AGP) Interface
The 855GME platform is configurable to support either the AGP interface for external graphics or the
DVO interface when using internal graphics.
• Supports AGP 2.0 data transfers
• Supports a single AGP (1X/2X/4X) device (either via a connector or on the motherboard)
• Only supports 1.5-V VDDQ for AGP electricals
• PCI semantic (FRAME# initiated) accesses to DRAM are snooped
• AGP semantic (PIPE# and SBA) traffic to DRAM is not snooped on the PSB and is therefore not
coherent with the CPU caches
• High priority access support
• Delayed transaction support for AGP reads that cannot be serviced immediately
• AGP Busy/Stop Protocol support
• Support for D3 Hot and Cold Device states
• AGP Clamping and Sense Amp control
®
Intel
855GM/855GME Chipset Platform Design Guide
System Overview
31
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