Cp Peak Active Video Readback; Table 51: Op_656_Range Description For Hdmi Receiver Input Mode; Table 52: Op_656_Range Description For Analog Front End Input Mode - Analog Devices Advantiv ADV7604 Hardware Manual

OP_656_RANGE , IO Map, Address 0x02, [2]
This bit decides the output range of the digital data. The
the gain setting, offset setting, and the data saturator setting. The settings applied depend on the type
of video signal and whether the signal is routed from the analog front end or from the HDMI
receiver. Refer to Table 51
Function
OP_656_RANGE
0
1

Table 51: OP_656_RANGE Description for HDMI Receiver Input Mode

Input Range
0 to 255
16 to 235

Table 52: OP_656_RANGE Description for Analog Front End Input Mode

OP_656_RANGE
0 (0 to 255 output)
1 (16 to 235 RGB output,
16 to 240 CrCb output)
ALT_DATA_SAT , IO Map, Address 0x02, [0]
The OP_656_RANGE
setting can be reversed using the
Function
ALT_DATA_SAT
0
1

10.3.7 CP Peak Active Video Readback

The ADV7604 provides circuitry that monitors the active CP video on a field basis and records the
largest value encountered during this time. It is intended to be used in a peak-white type AGC for
signals that do not have an embedded horizontal synchronization pulse, and to provide feedback on
the accurate function of the built-in AGC loop.
Rev. F August 2010
and Table 52.
Description
Output range is 0 to 255
Output range is 16 to 235 for Y and RGB
Output range is 16 to 240 for CrCb
OP_656_RANGE
0 (0 to 255 output)
1 (16 to 235 RGB output,
16 to 240 CrCb output)
0 (0 to 255 output)
1 (16 to 235 RGB output,
16 to 240 CrCb output)
setting automatically sets the data saturation required. This data saturator
ALT_DATA_SAT
Description
Data saturator setting (enable/disable) according to OP_656_RANGE
setting
Reverses OP_656_RANGE decision to enable or disable the data
saturator
OP_656_RANGE
Gain
1
(235-16)/255 = 0.859
255/(235-16) = 1.164
1
Gain
(255-0+1) x 16/1792 = 2.29
(235-16+1) x 16/1792 = 1.96
bit.
239
ADV7604
setting automatically sets