TW9903 Просмотр технического описания (PDF) - Unspecified

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TW9903

Multi-standard Video Decoder With High Quality Down Scaler

Unspecified 

TW9903

To further enhance the image, a programmable vertical peaking function is provided for up to +6db

of enhancement. A programmable coring level can be adjusted to minimize the noise

enhancement.

The Hue and Saturation

When decoding NTSC signals, TW9903 can adjust the hue of the chroma signal. The hue is

defined as a phase shift of the subcarrier with respect to the burst. This phase shift can be

programmed through a control register.

The color saturation can be adjusted by changing the gain of Cb and Cr signals for all NTSC, PAL

and SECAM formats. The Cb and Cr gain can be adjusted independently for flexibility.

Closed Caption Decoding

TW9903 has a built-in Closed Caption (CC) and Extended Data Services (EDS) decoder that

adheres to the EIA-608 standard. This decoder can be enabled or disabled independently on line

21 and line 284 for NTSC.

The decoded data is made available through CC_DATA and CC_STATUS registers that can be

accessed through the 2-WIRE SERIAL MPU interface.

Power Management

The TW9903 can be put into power-down mode in which its clock is turned off for most of the

circuits. The Y, C/Pr and Pb path can be separately powered down.

Control Interface

The TW9903 registers are accessed via 2-WIRE SERIAL MPU interface. It operates as a slave

device. Serial clock and data lines, SCL and SDA, transfer data from the bus master at a rate of

400 Kbits/s. The TW9903 has two serial interface address select pins to program up to four unique

serial addresses TW9903. This allows as many as four TW9903 to share the same serial bus.

Reset signals are also available to reset the control registers to their default values.

TECHWELL, INC.

10

REV. 0.92 ( B )

06/02/2002

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