GENERAL DESCRIPTION

The CMOS circuit SAA7196, digital video decoder, scaler and clock generator (DESCPro), is a highly integrated circuit for DeskTop Video applications. It combines the functions of a digital multistandard decoder (SAA7191B), a digital video scaler (SAA7186) and a clock generator (SAA7197).

FEATURES

• Digital 8-bit luminance input [video (Y) or CVBS]

• Digital 8-bit chrominance input [CVBS or C from CVBS, Y/C, S-Video (S-VHS or Hi8)]

• Luminance and chrominance signal processing for main standards PAL, NTSC and SECAM

• Horizontal and vertical sync detection for all standards

• User programmable luminance peaking for aperture correction

• Compatible with memory-based features (line-locked clock, square pixel)

• Cross colour reduction by chrominance comb-filtering for NTSC or special cross-colour cancellation for SECAM

• UV signal delay lines for PAL to correct chrominance phase errors

• Square-pixel format with 768/640 active samples per line

• The bidirectional expansion port (YUV-bus) supports data rates of 780 × fH (NTSC) and 944 × fH (PAL, SECAM) in 4 : 2 : 2 format

• Brightness, contrast, hue and saturation controls for scaled outputs

• Down-scaling of video windows with 1023 active samples per line and 1023 active lines per frame to randomly sized windows

• 2D data processing for improved signal quality of scaled luminance data, especially for compression applications

• Chroma key (α-generation)

• YUV to RGB conversation including anti-gamma ROM tables for RGB

• 16-word output FIFO (32-bit words)

• Output configurable for 32-, 24- and 16-bit video data bus

• Scaled 16-bit 4 : 2 : 2 YUV output

• Scaled 15-bit RGB (5-5-5+α) and 24-bit (8-8-8+α) output

• Scaled 8-bit monochrome output

• Line increment, field sequence (odd/even, interlace/non-interlaced) and vertical reset control for easy memory interfacing

• Output of discontinuous data bursts of scaled video data or continuous data output with corresponding qualifier signals

• Real-time status information

• I2C-bus control

• Only one crystal of 26.8 MHz required

• Clock generator on chip.