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HMC7043 GPO is always high

Hi there,

I have browsed other posts and used the GPO pin to check the "clock ouputs phase status", while there is a problem.

The 0x0046 is programmed by 0x00 and 0x0050 is programmed by 0x0F, the GPO status received by FPGA is always high.That is just after power up.

After that, I tried to set 0x0050 with 0x2D, got same result.

The circuitment between HMC7043 and FPGA as show blew:

When 0 ohm resister is tested by oscilloscope, the voltage is around 180mV.

We're looking forward to your reply. Thanks

Alex