CIP3250A 查看數據表（PDF） - Micronas

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CIP3250A

Component Interface Processor

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ADVANCE INFORMATION

CIP 3250A

2.10. YUVin Interpolator (LPF 4:4:4)

– UV-Interpolation 4:1:1 or 4:2:2 ⇒ 4:4:4

In order to mix the digital input data with the 4:4:4 video

standard from the analog RGB/YUV input, correctly, the

chroma samples of the digital input have to be interpo-

lated.

In case of YUV 4:1:1 input from DIGIT 2000, a two stage

interpolation filter is implemented. In the first stage, an

interpolation filter is used, which converts the YUV 4:1:1

standard into the YUV 4:2:2 standard.

In the second stage, the interpolation is from the YUV

4:2:2 to YUV 4:4:4.

In the case of YUV 4:2:2 input, only the second stage is

necessary.

Refer to I2C registers <06>DELAYU, <10>UVFRM3,

and <10>UVFRM1 to choose the correct interpolation

filters (see Fig. 2–2).

2.11. YUV Output Low-pass Filter 4:2:2 and 4:1:1

– Y low-pass filter with 7 selectable cutoff frequencies

– UV low-pass decimation filter 4:4:4 ⇒ 4:2:2/4:1:1 with

5 selectable cutoff frequencies

To meet the bandwidth requirements of different video

standards, such as 4:2:2 or 4:1:1 at various sampling

frequencies, the luma signal (Y) and the chroma signal

(UV) can be lowpass filtered. There are 7 different cutoff

frequencies selectable for luma, via I2C register

<05>LPFLUM and 5 different cutoff frequencies select-

able for chroma, via I2C register <07>LPFCHR. The

spectra of the luminance filters are shown in Fig. 2–9,

and the spectra of the chrominance filters are shown in

Fig. 2–10.

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