View tda933xh modification hop n1 to n2 datasheet:

TDA933xH N1 - N2C Modifications List 31 May 1999 Customer edition page 1 of 4 Modifications List TDA933xH N1 to N2C version Sync/Geo: - Automatic polarity detection on Hd and Vd inputs added, so that the IC can handle sync pulses with positive or negative polarity. Polarities can be read out via status bits HPOL and VPOL. This read-out gives the possibility to read-out the used VGA mode. - Free running frequency of horizontal PLL selectable between 31.3 and 33.7 kHz with HDTV bit. - Catching range of horizontal PLL reduced from +/- 6% to +/- 5% around free running frequency. This limits the line flyback voltage at low frequency to an acceptable level. - Clamp pulse timing selectable for HDTV signals with busbit HDCL. See also latest spec. 1999 April 12, page 37 fig. 11. - St