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286 AMD Geode™ LX Processors Data Book
Display Controller
33234H
6.5.1.9 Video Overlay Support
The GUI block also supports a video overlay function. The
DC has flexible addressing capability for YUV 4:2:2 and
YUV 4:2:0 display surfaces. Video data is stored in a sepa-
rate buffer within the off-screen frame buffer. Independent
surface pitch control is provided for Y and U/V.
The DC fetches the contents of the video and transmits it to
the Video Processor once per frame.
The Video Processor provides enhanced overlay scaling
and filtering options.
The width of the video output port is 32 bits. This allows the
display of high-resolution video source material (up to 1920
horizontal pixels) mixed with high-resolution graphics data.
Table 6-36 illustrates the minimum video port bandwidth
required for a number of different graphics display resolu-
tions.
Table 6-36. Video Bandwidth
Resolution Refresh Rate (Hz)
Line Rate
(KHz)
Video Source
Size (B)
Video Port Bandwidth
Required (MB/s)
640x480 60 31.5 1440 45.4
2160 68.0
85 43.3 1440 62.4
2160 93.5
800x600 60 37.9 1440 54.5
2160 81.9
85 53.7 1440 77.3
2160 116.0
1024x768 60 48.4 1440 69.7
2160 105
85 68.7 1440 98.9
2160 148.4
1280x1024 60 64.0 1440 92.2
2160 138
85 91.1 1440 131
2160 197
1600x1200 60 75.0 1440 108
2160 162
70 87.5 1440 126
2160 189