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DAC38RF89: Verifying the AUTOSYNC for NCO updates

Part Number: DAC38RF89

Hello,

I'm trying to verify the frequency change after writing the 3 (16 bit) NCO registers.  I can write them and then check the SIF SYNC box on the gui and the NCO changes frequency.  I wrote to registers 0x11E, 0X11F, and 0x120 three values.  I thought the autosync should create the SYNC after the last of these three registers are written.  Am I missing something with setting a page bit (which by the way I don't see register 9 or 0x0A show up in the register map in the GUI), or have one of the other settings incorrect? 

Thanks,

Jonathan