Cp Offset Block - Analog Devices Advantiv ADV7619 Hardware User's Manual

UG-237
Function
CP_GAIN_FILT[3:0]
0000 (default)
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
All other values
Other Gain Controls
OP_656_RANGE , IO, Address 0x02[2]
A control to set the output range of the digital data. It also automatically the data saturator setting.
Function
OP_656_RANGE
0 (default)
1
Table 47. OP_656_RANGE Description for HDMI Receiver Input Mode
Input Range
0 to 255
16 to 235
Table 48. 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, Address 0x02[0]
A control to disable the data saturator that limits the output range independently of OP_656_RANGE. This bit is used to support
extended data range modes.
Function
ALT_DATA_SAT
0 (default)
1

CP OFFSET BLOCK

The offset block consists of three independent adders, one for each channel. Using the A_OFFSET, B_OFFSET, and C_OFFSET registers,
a fixed offset value can be added to the data. The actual offset used can come from two different sources:
The ADV7619 includes an automatic selection of the offset value, dependent on the CSC mode that is programmed by the user. The
RGB_OUT and OP_656_RANGE bits are used to derive offset values.
A manual, user defined value can be programmed.
When the offset registers (A_OFFSET, B_OFFSET, and C_OFFSET) contain the value 0x3FF (reset default), the offset used is determined
using the automatic selection process. For any other value in the offset registers, the automatic selection is disabled and the user-
programmed offset value is applied directly to the video. Refer to the flowchart in Figure 42.
Description
No filtering, that is, coefficient A = 1.
Coefficient A = 1/128 lines.
Coefficient A = 1/256 lines.
Coefficient A = 1/512 lines.
Coefficient A = 1/1024 lines.
Coefficient A = 1/2048 lines.
Coefficient A = 1/4096 lines.
Coefficient A = 1/8192 lines.
Coefficient A = 1/16,384 lines.
Coefficient A = 1/32,768 lines.
Coefficient A = 1/65,536 lines.
Coefficient A = 1/131,072 lines.
Reserved. Do not use.
Description
Enables full output range (0 to 255)
Enables limited output range (16 to 235)
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)
Description
Data saturator enabled or disabled according to OP_656_RANGE setting
Reverses OP_656_RANGE decision to enable or disable the data saturator
Rev. A | Page 122 of 204
Hardware User Guide
Gain
1
(235 − 16)/255 = 0.859
255/(235 − 16) = 1.164
1
Gain
(255 − 0 + 1) × 16/1792 = 2.29
(235 − 16 + 1) × 16/1792 = 1.96