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The SAA7114 is a video capture device for applications at the image port of Video Graphics Array (VGA) controllers.
The SAA7114 is a combination of a two-channel analog preprocessing circuit including source selection, anti-aliasing filter and Analog-to-Digital Converter (ADC), an automatic clamp and gain control, a Clock Generation Circuit (CGC), a digital multistandard decoder containing two-dimensional chrominance/luminance separation by an adaptive comb filter and a high performance scaler, including variable horizontal and vertical up and downscaling and a brightness, contrast and saturation control circuit.
It is a highly integrated circuit for desktop video and similar applications. The decoder is based on the principle of line-locked clock decoding and is able to decode the color of PAL, SECAM and NTSC signals into ITU 601 compatible color component values. The SAA7114 accepts CVBS or S-video (Y/C) as analog inputs from TV or VCR sources, including weak and distorted signals. An expansion port (X port) for digital video (bidirectional half duplex, D1 compatible) is also supported to connect to MPEG or a video phone codec. At the so called image port (I port) the SAA7114 supports 8-bit or 16-bit wide output data with auxiliary reference data for interfacing to VGA controllers.
The target application for the SAA7114 is to capture and scale video images, to be provided as a digital video stream through the image port of a VGA controller, for display via the frame buffer of the VGA, or for capture to system memory.
In parallel the SAA7114 also incorporates provisions for capturing the serially coded data in the Vertical Blanking Interval (VBI) data. Two principal functions are available:
The SAA7114 also incorporates field-locked audio clock generation. This function ensures that there is always the same number of audio samples associated with a field, or a set of fields. This prevents the loss of synchronization between video and audio during capture or playback.
The circuit is I2C-bus controlled (full write/read capability for all programming registers, bit rate up to 400 kbit/s).
