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324 AMD Geode™ LX Processors Data Book
Display Controller Register Descriptions
33234H
6.6.4.6 DC Video V Buffer Start Address Offset (DC_VID_V_ST_OFFSET)
This register specifies the offset at which the video V buffer starts.
Settings written to this register do not take effect until the start of the following frame or interlaced field.
6.6.4.7 DC Dirty/Valid Region Top (DC_DV_TOP)
This register specifies the top of the frame buffer memory region to be watched for frame-dirty mode.
Settings written to this register take effect immediately.
DC_VID_U_ST_OFFSET Bit Descriptions
Bit Name Description
31:28 FRAME_COUNT Frame Count. When reading this register, this field indicates the current frame count, as
determined by counting rising edges of VIP VSYNC. This value is reset to 0 when
VIP_VSYNC occurs and FRAME_CNT >= FRAME_LIMIT. It can also be written to pro-
vide a mechanism for software to synchronize activities between the VIP and the Dis-
play Controller. However, this can result in corrupted video data until the next reset of
this counter.
27:0 OFFSET Video U Buffer Start Offset. This value represents the starting location for the Video U
Buffer. The lower three bits should always be programmed as zero so that the start off-
set is aligned to a QWORD boundary. A buffer for U data is only used if YUV 4:2:0 dis-
play mode is selected (DC Memory Offset 004h[20] = 1).
DC Memory Offset 028h
Typ e R /W
Reset Value xxxxxxxxh
DC_VID_V_ST_OFFSET Register Map
313029282726252423222120191817161514131211109876543210
RSVD OFFSET 0
DC_VID_V_ST_OFFSET Bit Descriptions
Bit Name Description
31:28 RSVD Reserved.
27:0 OFFSET Video V Buffer Start Offset. This value represents the starting location for the Video V
Buffer. The lower three bits should always be programmed as zero so that the start offset
is aligned to a QWORD boundary. A buffer for V data is only used if YUV 4:2:0 display
mode is selected (DC Memory Offset 004h[20] = 1).
DC Memory Offset 02Ch
Typ e R /W
Reset Value 00000000h
DC_DV_TOP Register Map
313029282726252423222120191817161514131211109876543210
RSVD DV_TOP RSVD
DV_TOP_EN