Analog Devices Advantiv ADV7611 Hardware User's Manual page 97

Hardware User Guide
QZERO_ITC_DIS , Addr 68 (HDMI), Address 0x47[2]
A control to select manual control of the RGB colorimetry when the AVI InfoFrame field Q[1:0] = 00. To be used in conjunction with
QZERO_RGB_FULL.
Function
QZERO_ITC_DIS
0 (default)
1
QZERO_RGB_FULL , Addr 68 (HDMI), Address 0x47[1]
A control to manually select the HDMI colorimetry when AVI InfoFrame field Q[1:0] = 00. Valid only when QZERO_ITC_DIS is set to 1.
Function
QZERO_RGB_FULL
0 (default)
1
Manual Color Space Conversion Matrix
The CP CSC matrix in the ADV7611 is a 3 x 3 matrix with full programmability of all coefficients in the matrix in manual mode. Each
coefficient is 12-bits wide to ensure signal integrity is maintained in the CP CSC section. The CP CSC contains three identical processing
channels, one of which is shown in Figure 33. The main inputs labeled In_A, In_B, and In_C come from the 36-bit digital input from the
HDMI section. Each input to the individual channels to the CSC is multiplied by a separate coefficient for each channel.
In Figure 33, these coefficients are marked A1, A2 and A3. The variable labeled A4 is used as an offset control for channel A in the CSC.
There is also a further CP CSC control bit labeled CSC_SCALE[1:0]; this control can be used to accommodate coefficients that extend the
supported range. The functional diagram for a single channel in the CP CSC as per Figure 33 is repeated for the other two remaining
channels, B and C. The coefficients for these channels are called B1, B2, B3, B4, C1, C2, C3, and C4.
DETECT QUANTIZATION RANGE
Q[1:0] = 01b
QZERO_RGB_FULL = 0
(DEFAULT)
RGB LIMITED RANGE
Figure 32. Manual RGB Range Control Flowchart for Auto CSC (Case RGB)
Description
AVI InfoFrame ITC bit decides RGB-full or limited range in case Q[1:0] = 00
Manual RGB range as per QZERO_RGB_FULL
Description
RGB-limited range when Q[1:0] = 00
RGB-full when Q[1:0] = 00
Y[1:0] = 00b
RGB 4:4:4 MODE
START
Q[1:0] = xxb?
Q[1:0] = 00b
QZERO_RGB_FULL = 1
1-BIT CONTROL
TO SELECT FULL/LIMITED
RGB/RANGE
Rev. A | Page 97 of 184
Q[1:0] = 10b
RGB FULL RANGE
UG-180