Table 51: Op_656_Range Description For Analog Front End Input Mode - Analog Devices ADV7850 Hardware Manual

Function
hsd_chb[9:0]
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hsd_chc[9:0], Addr 44 (CP), Address 0xE7[5:4]; Address 0xEA[7:0] (Read Only)
This readback displays the measured value of the HSync depth on channel C before the gain multiplier. The value is presented in 1.9
binary format.
Function
hsd_chc[9:0]
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hsd_fb[11:0], Addr 44 (CP), Address 0xEB[3:0]; Address 0xEC[7:0] (Read Only)
This readback displays the measured value of HSync depth on channel A, after gain multiplier, for an external feedback loop. The value
is presented in twos complement form. This means that only a standard adder is needed to subtract the actual HSync depth (as per
hsd_fb) from a nominal value, as the hsd_hb value is already in negative format.
Function
hsd_fb[11:0]
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op_656_range, Addr A0 (VFE), Address 0x02[2]
This control is used to set the output range of the digital data. It also automatically sets the gain setting, the offset setting, and the data
saturator setting.
Function
op_656_range
0 
1
The settings of op_656_range
from the HDMI receiver. Refer to
op_656_range
0 (0 to 255 output)
1 (16 to 235 RGB output,
16 to 240 CrCb output)
alt_data_sat, Addr A0 (VFE), Address 0x02[0]
This control is used to disable the data saturator that limits the output range independently of op_656_range. It is used to support
extended data range modes.
Function
alt_data_sat
0 
1
alt_sat_uv_man, Addr 44 (CP), Address 0x3E[1]
This control is used to define the U and V saturation range.
Rev. A May 2012
Description
Readback for measured value of HSync depth on channel B
Description
Readback for measured value of HSync depth on channel C
Description
Readback value
Description
Enable full output range (0 to 255)
Enable limited output range (16 to 235)
applied depend on the type of video signal and whether the signal is routed from the analog front end or
Table 51.

Table 51: OP_656_RANGE Description for Analog Front End Input Mode

Description
Enable/disable data saturator according to op_656_range setting
Reverse op_656_range decision to enable or disable data saturator
Gain
(255-0+1) x 16/1792 = 2.29
(235-16+1) x 16/1792 = 1.96
250
ADV7850