THC7984 Datasheet, PDF (32/45 Pages) THine Electronics, Inc. – 10-bit 3-channel Video Signal Digitizer

THC7984_Rev.2.0_E
R1E[5:4] VSOUT Output Signal Select
Select a output signal from VSOUT-pin.
00b: VO --- VSYNC generated from the HSYNC and VSYNC input, and synchronous with the PLL clock.
Output polarity (R13[1]) , Start Position (R20[6:0]) , and Pulse Width (R21[5:0]) can be select by the register setting
(auto setting modes are available) . PLL parameter settings (R02 to R04) are necessary for normal output. It is
synchronous with HO.
01b: Regenerated VSYNC --- VSYNC generated from the HSYNC and VSYNC input, and synchronous with the
internal oscillator clock (approximately 40 MHz) . Output polarity (R13[1]) , Start Position (R20[6:0]) , and Pulse Width
(R21[5:0]) can be selected by the register setting (auto setting modes are available) . PLL parameter settings (R02 to
R04) are unnecessary for normal output. It has jitter of several internal oscillator clock cycles. It is synchronous with
Regenerated HSYNC.
10b: Raw VSYNC --- Buffered signal of the VSYNC input
11b: Filtered VSYNC --- VSYNC generated from the HSYNC and VSYNC input, and digitally filtered with the internal
oscillator clock (approximately 40 MHz). It's possible to set polarity (R13 [1]) by register. (An automatic setting mode is
available.) It's generated regardless of PLL setting (R02-R04). It has jitter of several internal oscillator clock cycles. The
output phase is delayed about 3/4 H to input VSYNC.
< Output Signal from VSOUT>
Horizontal Period
Input VSYNC
VO
Regenerated VSYNC
Raw VSYNC
Filtered VSYNC
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