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AMD Geode™ LX Processors Data Book 347
Display Controller Register Descriptions
33234H
6.6.11.6 DC VBI Pitch and Size (DC_VBI_PITCH)
6.6.12 Color Key Control Registers
6.6.12.1 DC Color Key (DC_CLR_KEY)
DC Memory Offset 0B4h
Typ e R /W
Reset Value xxxxxxxxh
DC_VBI_PITCH Register Map
313029282726252423222120191817161514131211109876543210
RSVD VBI_Size VBI_Pitch
DC_VBI_PITCH Bit Descriptions
Bit Name Description
31:26 RSVD Reserved. Set to 0.
25:16 VBI_SIZE VBI Data Size. Indicates how many QWORDs of data to fetch from memory for each line
of VBI
15:0 VBI_PITCH VBI Data Pitch. Indicates how many QWORDs of memory space to increment when
moving from the start of one active VBI line to the start of the next.
DC Memory Offset 0B8h
Typ e R /W
Reset Value 00000000h
DC_CLR_KEY Register Map
313029282726252423222120191817161514131211109876543210
RSVD
CLR_KEY_EN
CLR_KEY
DC_CLR_KEY Bit Descriptions
Bit Name Description
31:25 RSVD Reserved. Set to 0.
24 CLR_KEY_EN Color Key Enable. This bit enables color key detection in the DC. When this bit is set,
the DC adjusts the alpha value of pixels whose 24-bit RGB values match the value in
CLR_KEY (bits [23:0]). A mask is also provided in CLR_KEY_MASK (DC Memory Offset
0BCh[23:0]) to indicate which bits can be ignored when performing this match. Color key
detection is performed after the data has been decompressed and the cursor has been
overlayed, but before scaling and filtering take place.
23:0 CLR_KEY Color Key. This field represents the RGB value that will be compared to DC pixels when
performing color key detection.