THC7984 Datasheet, PDF (20/45 Pages) THine Electronics, Inc. – 10-bit 3-channel Video Signal Digitizer

THC7984_Rev.2.0_E
R0C[0]/R0D[7:0] R-ch (Pr-ch) Clamp Level Offset
R0E[0]/R0F[7:0] G-ch (Y-ch) Clamp Level Offset
R10[0]/R11[7:0] B-ch (Pb-ch) Clamp Level Offset
Clamping restores DC level of the video signals. Three clamp modes can be selected; Pedestal clamp, Center clamp
(Midscale clamp) , and Sync tip clamp (R17[5:4]/R17[3:2]/R17[1:0]) .
It's possible to give an offset to the clamp level by the 1LSB unit by a clamp level offset. The register value is configured
by two's complement from -256 to +255.
< Clamp Level Offset >
Clamp Level Offset = 0 Clamp Level Offset > 0
1023
Clamp Level Offset < 0
Output Code
(Pedestal Clamp)
0
1023
Clamp Level Offset = 0
Clamp Level Offset
Clamp Level Offset > 0
Clamp Level Offset < 0
Output Code 512
(Center Clamp)
0
1023
Output Code
(256-level Clamp)
256
0
Clamp Level Offset = 0
Clamp Level Offset
Clamp Level Offset > 0
Clamp Level Offset < 0
Clamp Level Offset
R12[7:6] Reserved *Must be set to 00b (Default value: 00b)
R12[5] Input Port Automatic Selection Enable
1: Selection input port (R12[3]) is done automatically.
Under Automatic setting, with the judgement result of the input SYNC type by Sync Processor, An activated port is
selected with the following rules.
-When the selected port is activated, even if the other port becomes activated, selection of port doesn't change.
-Both ports are activate and one port which is selected became inactivate, selection of port changes to the other port.
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