PI7C9X9208 datasheet(13/53 Pages) PERICOM

13 / 53 page

PI7VD9004ABH

Adaptive EQ 4-channel 960H Video Decoder

Pericom Semiconductor Corporation

www.pericom.com

In general, the poor power adaptor or camera would introduce high frequency ripples coupling with sync tip to cause the

misjudgment on the beginning of a video frame or line. The built-in video processing circuit is able to decouple the noise

from sync tip to prevent from video loss.

A sharpness filter is implemented to offer programmable 16 level gains to increase the high frequency and edge

information of luma for better viewing on the contour of each object. Through the I2C serial interface, hue, contrast,

brightness and saturation can be programmed in the configuration registers. Hue can be controlled in 256 steps from -180

degrees to +180 degrees. Saturation can be programmed in 256 grades. Brightness can be adjusted in 256 levels.

4.7

Video Output Port

The four CVBS analog video channels are converted into four individual digital video data streams. There are four video

output ports (PIXOUT_0, PIXOUT_1, PIXOUT_2 and PIXOUT_3) in the chip and each video output port can carry

several converted digital video data stream following ITU-R BT.656 compatible data format. The video data of each port is

synchronous with the corresponding clock signals of PIXCLK_PO or PIXCLK_NO. The frequency of PIXCLK_*O can be

operated at 1x, 2x or 4x of 27MHz (720H mode) or 36MHz (960H mode). When the clock frequency is 2x or 4x rate, the

video port outputs 2-channel or 4-channel video data stream in time-multiplexed format. The clock phase of

PIXCLK_POor PIXCLK_NOcan be programmed by delay cells through writing delay value into the registers of

PIXCLK_P_DEL or PIXCLK_N_DEL. Also, the clock polarity can be controlled through inverter by setting or resetting the

design for video data stream on PCB.

Figure 4-1Time-multiplexed format with 108/144MHz

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PI7C9X9208 数据表(PDF) 13 Page - Pericom Semiconductor Corporation