AD9389 Analog Devices, AD9389 Datasheet - Page 15

• Manufacturer Part Number: AD9389
• Description: 800 MHz High Performance HDMI/DVI Transmitter
• Manufacturer: Analog Devices

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COLOR SPACE CONVERSION MATRIX (CSC)
The color space conversion matrix in the AD9389 consists of three
identical processing channels. In each channel, three input values
are multiplied by three separate coefficients. Also included are an
offset value for each row of the matrix and a scaling multiple for all
values. Each value is 13-bit, twos complement resolution to ensure
the signal integrity is maintained. The CSC is designed to run at
speeds up to 80 MHz supporting resolutions up to 1080i at 60 Hz
and UXGA at 60 Hz. With any-to-any color space support, RGB,
YUV, YCbCr, and other formats are supported by the CSC.
The main inputs, R
inputs from each channel. These inputs are based on the input
format detailed in Table 10 to Table 16. The mapping of these
inputs to the CSC inputs is shown in Table 17.
Table 17. CSC Port Mapping
Input Channel
R/Cr
Gr/Y
B/Cb
VSYNC
IN
, G
IN
a: VSYNC PLACEMENT
b: VSYNC DURATION
, and B
R
B
G
R0x32[3:0], R0x33[7:2]
R0x33[1:0], R0x34
IN
IN
IN
EAV
[11:0]
[11:0]
[11:0]
IN
CSC Input Channel
R
G
B
come from the 8-bit to 12-bit
IN
IN
B
IN
a1[12:0]
a2[12:0]
a3[12:0]
×
×
×
×
×
×
4096
4096
4096
1
1
1
a
Figure 6. VSYNC Reconstruction
Figure 7. Single CSC Channel
+
Rev. 0 | Page 15 of 48
+
b
a4[12:0]
One of the three channels is represented in Figure 7. In each
processing channel, the three inputs are multiplied by three
separate coefficients marked a1, a2, and a3. These coefficients
are divided by 4096 to obtain nominal values ranging from
−0.9998 to +0.9998. The variable labeled a4 is used as an offset
control. The CSC_Mode setting is the same for all three
processing channels. This multiplies all coefficients and offsets
by a factor of 2CSC_Mode.
The functional diagram for a single channel of the CSC, as per
Figure 7, is repeated for the remaining G and B channels. The co-
efficients for these channels are b1, b2, b3, b4, c1, c2, c3, and c4.
Register settings for several common conversions are listed in
the Color Space Converter (CSC) Common Settings section.
For a detailed functional description and more programming
examples, refer to
User's Guide.
+
×4
×2
CSC_Mode[1:0]
AN-795, The AD9880 Color Space Converter
2
1
0
SAV
R
OUT
[11:0]
AD9389