The second network port of RT1061 is blocked

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The second network port of RT1061 is blocked

Contributor I


We are debugging the circuit board equipped with RT1061CVL5A. The second network port has not been able to communicate. We have a  RT1064DVL6A development board on hand. Both network ports can communicate. What‘s the difference between the two chips?’See the attachment for related circuits;

1. The first network port can communicate, but when two network ports are initialized at the same time, the first network cannot communicate either;

2. The second network port light, speed light and link light are normal, but the ping fails;

3. When the second network port is connected to the network cable, use an oscilloscope to measure, txclk has a 50M clock, MDC frequency is 2.4M, TXEN, TXD0, and TXD1 are always low. Disconnect these 3 wires and the Mac is still Low level

4. Disconnect R86, R87, R88, and connect the three signal wires TXEN, TXD0, TXD1 to GPIO_EMC_30, 31, 32, the phenomenon is still the same;

I would like to ask, have any other customers encountered such a problem, or is there a solution?

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NXP TechSupport
NXP TechSupport

Hi xu hao,

  About the RT1060 two ethernet interface, one of our 3rd part company have designed one board OK1061, this is the related circuit:



You can check the circuit, whether some difference with your board or not?

As I know this board both two ethernet interfaces can work.

Wish it helps you!

If you still have questions about it, please kindly let me know.

Best Regards,



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