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.