SAA5250

INTEGRATED CIRCUITS DATA SHEET SAA5250 Interface for data acquisition and control (for multi-standard teletext systems) Product specification File under Integrated Circuits, IC02 January 1987 Philips Semiconductors Product specification Interface for data acquisition and control (for multi-standard teletext systems) GENERAL DESCRIPTION SAA5250 The SAA5250 is a CMOS Interface for Data Acquisition and Control (CIDAC) designed for use in conjunction with the Video Input Processor (SAA5230) in a multi-standard teletext decoder. The device retrieves data from a user selected channel (channel demultiplexer), as well as providing control signals and consecutive addressing space necessary to drive a 2 K bytes buffer memory. The system operates in accordance with the following transmission standards: French Didon Antiope specification D2 A4-2 (DIDON) North American Broadcast Teletext specification (NABTS) U.K. teletext (CEEFAX) Features 7,5 MHz maximum conversion rate Three prefixes; DIDON, NABTS and U.K. teletext (CEEFAX) Mode without prefix Internal calculation of the validation (VAL) and colour burst blanking (CBB) signals, if programmed Programmable framing code and channel numbers Error parity calculation or not (odd parity) Hamming processing of the prefix byte Full channel or VBI reception Slow/fast mode (detection of page flags or not) Maximum/default format up to 63 bytes Addressing space of 2 K bytes of the static memory Multiplexed address...