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436 AMD Geode™ LX Processors Data Book
Video Processor Register Descriptions
33234H
6.8.3.19 Cursor Color Key (CCK)
8GFX_INS_
VIDEO
Graphics Window inside Video Window.
0: Disable. The video window is assumed to be inside the graphics window. Outside the
alpha window, graphics or video is displayed, depending on the result of color key
comparison.
1: Enable. The graphics window is assumed to be inside the video window. Outside the
alpha windows, video is displayed instead of graphics. Color key comparison is not
performed outside the alpha window.
7YUV_CSC_ENYUV Color Space Conversion Enable. Enables YUV to YUV color space conversion on
the video YUV input. HDSD_VIDEO (bit 6) is used to determine which resolution the
source video is. The video will be converted to the opposite resolution.
If HDSD_VIDEO = 0: YUV
SD
-> YUV
HD
If HDSD_VIDEO = 1: YUV
HD
-> YUV
SD
6 HDSD_VIDEO High Definition/Standard Definition CSC on Video. Determines what the source video
resolution is for both YUV to RGB and YUV to YUV color space conversion algorithms.
0: Video source is in Standard Definition (Rec.ITU-R BT-601).
1: Video source is in High Definition (Rec.ITU-R BT-709).
5 RSVD (RO) Reserved (Read Only). Reads back as 0.
4SP Spare. Read/write, no function.
3 RSVD (RO) Reserved (Read Only). Reads back as 0.
2:0 SP Spares. Read/write, no function.
VP Memory Offset 0A0h
Typ e R /W
Reset Value 00000000_00000000h
VDE Bit Descriptions (Continued)
Bit Name Description
CCK Register Map
63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32
RSVD
313029282726252423222120191817161514131211109876543210
RSVD
CCK_EN
COLOR_REG_
OFFSET
CUR_COLOR_KEY
CCK Bit Descriptions
Bit Name Description
63:30 RSVD (RO) Reserved (Read Only). Reads back as 0.
29 CCK_EN Cursor Color Key Enable. This bit enables the cursor color key matching function.
0: Disable. Graphics data will never match the cursor color key.
1: Enable. Graphics data is compared to the cursor color key.
28:24 COLOR_REG_
OFFSET
Cursor Color Register Offset. This field indicates a bit in the incoming graphics stream
that is used to indicate which of the two possible cursor color registers should be used for
color key matches for the bits in the graphics stream.
23:0 CUR_COLOR_
KEY
Cursor Color Key. Specifies the 24-bit RGB value of the cursor color key. The incoming
graphics stream is compared with this value. If a match is detected, the pixel is replaced
by a 24-bit value from one of the cursor color registers.