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Can the ADV734X or ADV739X support the RS170 Spec?

Yes, both the ADV734X and the ADV739X can both support the RS170 specification for video. The following I2C writes are required:

Register 0x86, bits [1:0] = 01B will change the delay from the falling edge of HS to the start of the color burst to 5.3uS

Register 0x84, bit [3] = 1B reduces active video line length (increases horizontal blanking period.)