Date: Thu, 15 May 1997 22:42:48 +0200 (CEST) From: Luigi Rizzo <luigi@iet.unipi.it> To: multimedia@freebsd.org Subject: teletext decoder on the hauppauge ? Message-ID: <Pine.BSF.3.95q.970515222006.312A-100000@prova.iet.unipi.it>
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Hi, does anyone know how the teletext decoder (SAA5246A) is connected to the Bt848 on the Hauppauge card ? I have the data sheet of the saa5246a and it seems the only way to fetch the teletext data is by hooking into the lines between the teletext decoder and the RAM, but there appears to be no way to acquire control of the ram from the Bt848. Hence I assume the only way would be to let the SAA5246A display the page, and read address (13 bit), data (8) and OE (1) lines of the ram using 22 of the 24 GPIO lines of the Bt848 (2 are presumably used for the audio mux). Does not seem very efficient. Maybe the board is done differently ? Thanks Luigi ==================================================================== Luigi Rizzo Dip. di Ingegneria dell'Informazione email: luigi@iet.unipi.it Universita' di Pisa tel: +39-50-568533 via Diotisalvi 2, 56126 PISA (Italy) fax: +39-50-568522 http://www.iet.unipi.it/~luigi/ ====================================================================
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