THC7984_15 Datasheet, PDF (38/46 Pages) THine Electronics, Inc. – 10-bit 3-channel Video Signal Digitizer

THC7984_Rev.2.0_E
R24[6:0] Clamp Pre-COAST
Clamp should be suspended during the vertical blank time including the pulses disturbing clamp such as copy protection
signal. Clamp COAST signal causes clamp to be suspend.
Set the start position of Clamp COAST in steps of 1 line with reference to the leading edge of the VSYNC input.
R25[6:0] Clamp Post-COAST
Set the end position of Clamp COAST in steps of 1 line with reference to the leading edge of the VSYNC input.
< Clamp COAST Timing>
Horizontal Period
Analog Input
Clamp COAST
Clamp Pre-COAST
Clamp Post-COAST
* Clamp COAST timing is related to a 3-level slicer. In case that Sync type select is "Sync on Video (3-level) "
(R12[1:0]=11b) , Clamp COAST timing should cover VSYNC pulse (and the period which includes equalization pulses
in interlace signal) , and end at least 12 lines prior to the active line start.
(Setting example: Clamp Pre-COAST=2 / Clamp Post-COAST=8).
R26[3:0] / R27[7:0] DE Start Position
set the start position of DE (Data Enable) available from O/E FIELD-pin in steps of 1 pixel with reference to the leading
edge of the HSYNC input (the leading edge of the positive pulse for 3-level sync) .
R28[3:0] / R29[7:0] DE Pulse Width
set the pulse width of DE (Data Enable) available from O/E FIELD-pin in steps of 1 pixel.
The output polarity of DE is Active-High.
< DE Horizontal Timing>
Input HSYNC
DE
DE Start Position
DE Pulse Width
R2A[6:0] V-Blank Front Porch (DE End Line Position)
Set the end line of DE (Data Enable) available from O/E FIELD-pin in steps of 1 line with reference to the VSYNC
Output Start Position (R20[6:0]) .
R2B[6:0] V-Blank Back Porch (DE Start Line Position)
Set the start line of DE (Data Enable) available from O/E FIELD-pin in steps of 1 line with reference to the VSYNC
Output End Position (R20[6:0]+R21[5:0]) .
< V-Blank Front Porch / V-Blank Back Porch >
Horizontal Period
Input VSYNC
Output VSYNC
Output VSYNC Pulse Width
DE
V-Blank Front Porch
V-Blank Back Porch
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