SAA5250 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...
SAA5250 Key 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