syncronize nco on different fpga

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Hi,

i've to generate two sinusoidal signals (about 70Hz) with two different altera ip nco implemented i 2 different fpga (CLK=50MHz and CLK_EN=25khz). The sinusoid is sampled @ 25khz.

The problem is that those signals should have the same phases.

There is available a sync signal for that 2 fpgas. This sync is a pulse with 100ms period and 10ns bit width. Eventually I can change the period.

How could i use this sync signal in order to correct the phase of NCOs and maintain two output signals in phase coherence?

Could you help me? Have you any idea to meet this issue?

Thanks

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use sync arrival to create logic for clock enable on NCO. And you need to account also for delays of two nco at point of check