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Intel
®
82854 Graphics Memory Controller Hub (GMCH)
12 D15343-003
System Interrupts
•
Supports Intel 8259 and front side bus interrupt delivery mechanism
• Supports interrupts signaled as upstream memory writes from PCI and Hub interface
• MSI sent to the CPU through the system bus
• IOxAPIC in ICH4-M provides redirection for upstream interrupts to the system bus
Video Stream Decoder
• Hardware motion compensation for MPEG2
• All video format decoder (18 ATSC video formats) supported
• Dynamic Bob and Weave support for video streams
• Software DVD at 60 Fields/second and 30 frames/second full screen
• Support for standard definition DVD (i.e., NTSC pixel resolution of 720x480, and so on)
quality encoding at low CPU utilization
Video Overlay
• Single high quality scalable overlay and second Sprite to support second overlay
• Multiple overlay functionality provided via arithmetic stretch BLT (Block Transfer)
• 5-tap horizontal, 3-tap vertical filtered scaling
• Multiple overlay formats
• Direct YUV from overlay to TV-out
• Independent gamma correction
• Independent brightness / contrast/ saturation
• Independent tint/hue support
• Destination colorkeying
• Source chromakeying