I have two ad9652 devices I am testing in a four channel design (all synchronous). I have configured both devices sync control (0x100) to a value of 0x3 (clock divider sync enabled and master sync buffer enable), and set the devices to output the PN9 test pattern. I then apply the SYNC signal to the devices. The pattern I collect is not aligned for the four channels. It appears that SYNC has no effect on the pattern. I have looked at the data sheet and AN877 and cannot find any information on SYNC and test patterns. Should it synchronize the test patterns?