Analog Devices ADV7610 Hardware User's Manual page 106

UG-438
HDMI_MODE
YES
INPUT
OP_656_RANGE
RANGE
0 (0 TO 255 OUTPUT)
0 TO 255
1 (16 TO 235 Y/RGB (235 – 16)/255
16 TO 240 CrCb)
255(255 – 16)
0 (0 TO 255 OUTPUT)
16 TO 235
1 (16 TO 235 Y/RGB
16 TO 240 CrCb)
AGC_MODE_MAN, Addr 44 (CP), Address 0x73[6]
A control to set how the gains for all three channels are configured.
Function
AGC_MODE_MAN
0 (default)
1
Manual Gain Control
By setting the GAIN_MAN
replaced by three dedicated I
Using these factors with the
[0...3.999]. The A_GAIN[9:0], B_GAIN[9:0],
manual gain.
X_GAIN[9:0] = floor(GAIN × 256)
where:
0 ≤ GAIN < 4.
floor( ) is the floor function that returns the largest integer not greater than its input parameter.
X refers to A, B, and C.
Table 42. Example
Example Gain
dec
0.5
0.98887
2.5
GAIN_MAN, Addr 44 (CP), Address 0x73[7]
Enables the gain factor to be set by the AGC or manually.
Function
GAIN_MAN
0 (default)
1
NO
AGC_MODE_MAN
NO
GAIN
OP_656_RANGE
0 (0 TO 255 OUTPUT)
1
1 (16 TO 235 Y/RGB
= 0.859 16 TO 240 CrCb)
= 1.164
1
Figure 35. CP Automatic Gain Controls
Description
The gain is dependent on the type of input and OP_656_RANGE.
Gain operation controlled by GAIN_MAN.
bit, the gain factors for Channel A, Channel B, and Channel C are no longer taken from the AGC, but are
2 C registers.
HSD_FB[11:0] register, it is possible to implement an off-chip AGC if desired. The range for the gain is
C_GAIN[9:0]
A_GAIN[9:0]
0x80
0xFD
0x280
Description
AGC controls the gain for all three channels.
Manual gains are used for all three channels.
YES
GAIN
SET GAIN BASED ON
A/B/C_GAIN[9:0] VALUE
(255 – 0 + 1) ×
16/1344 = 3.047
(235 – 16 + 1) ×
16/1344 = 2.617
registers are in 2.8 binary format and can be set as shown in Equation 8, CP
(7)
Rev. 0 | Page 106 of 184
Hardware User Guide
YES
GAIN_MAN
YES
SSPD DETECTED
EMBEDDED SYNCS??
AGC
OP_656_RANGE
ACTIVE
0 (0 TO 255 OUTPUT)
1 (16 TO 235 Y/RGB
16 TO 240 CrCb)
NO
NO
GAIN
(255 – 0 + 1) ×
16/1344 = 3.047
(235 – 16 + 1) ×
16/1344 = 2.617