AD9389SLASHPCB datasheet(15/48 Pages) AD

15 / 48 page

AD9389

Rev. 0 | Page 15 of 48

a: VSYNC PLACEMENT

R0x32[3:0], R0x33[7:2]

b: VSYNC DURATION

R0x33[1:0], R0x34

EAV

VSYNC

SAV

Figure 6. VSYNC Reconstruction

4096

×2

×4

a1[12:0]

RIN[11:0]

4096

a2[12:0]

BIN[11:0]

4096

a3[12:0]

GIN[11:0]

CSC_Mode[1:0]

ROUT[11:0]

a4[12:0]

Figure 7. Single CSC Channel

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, RIN, GIN, and BIN come from the 8-bit to 12-bit

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

CSC Input Channel

R/Cr

RIN

Gr/Y

GIN

B/Cb

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.

the Color Space Converter (CSC) Common Settings section.

For a detailed functional description and more programming

examples, refer to AN-795, The AD9880 Color Space Converter

User's Guide.

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