I2S in camera slave mode use I2Snl_WS_in as clock, so max frequnce is?

Hi, i had no problem with this board to capture SVGA jpeg image with 20MHz XCLK, also jpeg quality is no issue. Only problem is that you need very good and stable power source or you get artifacts instead of image. Yes. Even SVGA 800x600 if i lower the quality. (the higher number indicate the lower...