THC7984 Datasheet, PDF (22/45 Pages) THine Electronics, Inc. – 10-bit 3-channel Video Signal Digitizer

THC7984_Rev.2.0_E
R13[3] HSYNC Output, VSYNC Output Polarity Automatic Select Enable
1: HSYNC Output Polarity (R13[2]) and VSYNC Output Polarity (R13[1]) are automatically set to the same polarity
as the input.
When Automatic Select is enabled, the sync output polarity is determined by sync processor based on the result of
HSYNC Input Polarity Detection (R2D[1]) and VSYNC Input Polarity Detection (R2D[2]) .
R13[2] HSYNC Output (HSOUT) Polarity
Select the HSYNC output polarity of HSOUT-pin.
0: Output polarity is Active-Low.
1: Output polarity is Active-High.
* The polarity of HSYNC available from HSOUT-pin (HO, Regenerated HSYNC) is selected.
R13[1] VSYNC Output (VSOUT) Polarity
Select the VSYNC output polarity of VSOUT-pin.
0: Output polarity is Active-Low.
1: Output polarity is Active-High.
* The polarity of VSYNC available from VSOUT-pin (VO, Regenerated VSYNC, Raw VSYNC) is selected.
R13[0] VSYNC Output (VSOUT) Interlace Mode
Select the output mode of VSYNC available from VSOUT-pin (VO, Regenerated VSYNC) for interlaced video input.
1: VSYNC Output (VO, Regenerated VSYNC) is produced at the center of horizontal period when video field of
interlaced video changes from ODD field to EVEN field.
0: VSYNC Output is produced only at the start position of horizontal period. Consequently, the vertical total line number
of interlaced video changes by 1 depending on video field.
* The output mode of VSYNC available from VSOUT-pin (VO, Regenerated VSYNC) is selected. Raw VSYNC is not
affected by this mode.
* The edge of VSYNC Output always occurs at the start position of horizontal period for non-interlaced video
(Detection result: R2E[7]=0) . Therefore, R13[0]=0 and R13[0]=1 produce the same result for non-interlaced video.
< VSOUT Interlace Mode >
EVEN Field -> ODD Field ^{Horizontal Cycle}
Input Sync
VSOUT (R13[0]=1)
VSOUT (R13[0]=0)
ODD Field -> EVEN Field ^{Horizontal Cycle}
Input Sync
VSOUT (R13[0]=1)
VSOUT (R13[0]=0)
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