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Register settings for ADV7511 with 4:4:4 RGB or YCbCr

Question asked by tgrib on May 17, 2013
Latest reply on May 28, 2013 by mattp

I've been using the ADV7511 with 4:2:2 but are adding 4:4:4 RGB and 4:4:4 YCbCr modes but the output video has faint vertical lines across the image when I send data that ramps.  Normal video shows random data value shifts that seem to be more prevalent with blue content but is seen in other colors also. The same data is sent to a different interface (SDI) and looks OK.  I am feeding data using DDR mode with separate syncs (Input ID =5). So main reg 0x15 = 0x25 for 4:4:4 RGB and reg 0x16 = 0x14 (RGB 4:4:4 output format, 10 bits data, Style 2 data format, RGB input color space).  I found that if I invert the DDR edge and set the Style bit [3:2] = 0 which is Not Valid the resultant video looks correct (reg 0x16 = 0x12). I'm concerned about setting a register to a value that is not valid but it works.  Has anyone seen this before? What does setting Input Style bits [3:2] to zero do in this mode? Thanks.