Intel® 82854 Graphics Memory Controller Hub (GMCH)

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

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D15343-003

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Intel D15343-003 manual System Interrupts, Video Stream Decoder, Video Overlay