AMD Geode LX 800@0.9W - Manual (Page 508)

508 AMD Geode™ LX Processors Data Book
Video Input Port Register Descriptions 33234H
6.10.2.29 VIP VSYNC Error Count (VIP_SYNC_ERR_COUNT)
6.10.2.30 VIP Task A U Even Offset (VIP_TASK_A_U_EVEN_OFFSET)
VIP Memory Offset 78h
Type
R/W
Reset Value 00000000h
VIP_SYNC_ERR_COUNT Register Map
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
VERTICAL_WINDOW VERTICAL_COUNT
VIP_SYNC_ERR_COUNT Bit Descriptions
Bit Name Description
31:24 VERTICAL_
WINDOW Vertical Window. This field defines the number of VIP clocks the input VBLANK can
vary before it is considered invalid. (16-4095 clocks)
23:0 VERTICAL_
COUNT Vertical Count. This field provides the check point for verifying that the input data stream
is maintaining consistent VSYNC timing. This count is the minimum number of VIP clocks
expected in an input field (interlaced video) or frame (non-interlaced video). If the number
of video clocks between rising edges of VBLANK is less then this number (or greater
then VERTICAL_COUNT + VERTICAL_WINDOW), a VSYNC error interrupt is gener-
ated and the video_ok output signal is forced low indicating invalid input video. (0-
16,777,215 clocks)
Note: A 60 Hz VBLANK rate @75 MHz input clock = 1,250,000 clocks.
VIP Memory Offset 7Ch
Type
R/W
Reset Value 00000000h
VIP_TASK_A_U_EVEN_OFFSET Register Map
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
TASK_A_U_EVEN_OFFSET Program to 00000
VIP_TASK_A_U_EVEN_OFFSET Bit Descriptions
Bit Name Description
31:0 TASK_A_U_
EVEN_OFFSET Task A U Even Offset. This register determines the starting address of the U buffer for
the even field when in interlaced input mode and data is stored in planar format. This reg-
ister is not used when in non-interlaced input mode. The value in this register needs to be
32-byte aligned. (Bits [4:0] are required to be 00000.)