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AD9980PCB 데이터시트(PDF) 17 Page - Analog Devices

부품명 AD9980PCB
상세설명  High Performance 8-Bit Display Interface
PDF  44 Pages
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제조업체  AD [Analog Devices]
홈페이지  http://www.analog.com
Logo AD - Analog Devices

AD9980PCB 데이터시트(HTML) 17 Page - Analog Devices

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AD9980
Rev. 0 | Page 17 of 44
HSYNCOUT
VSYNC
FILTER
WINDOW
EXPECTED
EDGE
FILTER
WINDOW
EQUALIZATION
PULSES
HSYNCIN
Figure 10. Sync Processing Filter
Vsync Filter and Odd/Even Fields
The Vsync filter is used to eliminate spurious Vsyncs, maintain
a stable timing relationship between the Vsync and Hsync
output signals, and generate the odd/even field output.
The filter works by examining the placement of Vsync with
respect to Hsync, and if necessary, slightly shifting it in time.
The goal is to keep the Vsync and Hsync leading edges from
switching at the same time, eliminating confusion as to when
the first line of a frame occurs. Enable the Vsync filter with
Register 0x14, Bit 2. Use of the Vsync filter is recom-mended for
all cases, including interlaced video, and is required when using
the Hsync per Vsync counter. Figure 12 illustrates even/odd
field determination in two situations.
FIELD 1
FIELD 0
SYNC SEPARATOR THRESHOLD
FIELD 1
FIELD 0
23
2
1
44
31
HSYNCIN
VSYNCIN
VSYNCOUT
O/E FIELD
ODD FIELD
QUADRANT
Figure 11.



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