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how to use MNTO and SNTI to sync NCO of multi-AD9208

Hi

Everyone.

I have a problem of MNTO and SNTI of AD9208. In page 50 of datasheet, it seems that one AD9208 can be set as master, and the other AD9208 can be set as slave. Master can output a MNTO via one of its GPIO(config by 0x0040, 0x0041, 0x0042). The slave one receive the MNTO by one of its GPIO which is set to be SNTI.

I config GPIO_A0 of AD9208_1 as MNTO, and GPIO_B0 of AD9208_2 as SNTI. Then I capture MNTO with oscilloscope. It never goes high. How can I activate the MNTO?

THANKS

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