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DP83640: DP83640 cannot work

Part Number: DP83640


Dear Sir

Our plotform is Xilinx Zynq SoC, we use DP83460 as PL Ethernet.

We have two project, Xilinx Zynq 7000(XC7Z020) and Zynq UltraScale+(XCZU3EG).

Xilinx Zynq 7000(XC7Z020) work fine.(PL Ethernet with DP83460).

But Xilinx Zynq UltraScale+(XCZU3EG) (PL Ethernet with DP83460) doesn't work!

We had checked the following items

1) Power (3.3V, 0V) => OK

2) CRYSTAL/OSCILLATOR INPUT (X1) (25MHz) => OK

3) Signal

   - RESET => high(3.14V)

   - MDIO, MDC => high(3.3V) ... not knowing if it is OK for register configuration

   - (TX CLK, TX EN) = (50MHz, 750mV) ... where Xilinx Zynq 7000(XC7Z020) work fine at (25MHz, 50mV)

   - (RX CLK, RX DV) = (50MHz, 50mV) ... where Xilinx Zynq 7000(XC7Z020) work fine at (25MHz, 50mV)

Is there any suggestion to solve the Xilinx Zynq UltraScale+(XCZU3EG) (PL Ethernet with DP83460) problem ?