Do not working ethernet with kinetis K64 with KSZ8081RNACA

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Do not working ethernet with kinetis K64 with KSZ8081RNACA

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VilemZ
NXP Employee
NXP Employee

Hi everyone,

I have working software on FRDM K64 and I tried make own hardware - I inspired from FRDM K64 schematic. Now, I have issue with connection ethernet. Schematic is on attachment. 

I tried read registers from KSZ8081RNACA - it is OK. When I connected cable, then it is not see any change. Any change on registers, any change on router. 

Please, could you help me, how can I debug it and find issue?

Thank you

Vilem

4 Replies

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VilemZ
NXP Employee
NXP Employee

I tried change XTAL for PHY (25 MHz). It is OK. When xtal is not soldered on board, then kinetis not working too, because I am using 120 MHz clock for kinetis. 

Now, I don't know, what have I do? Please help.

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kazukiyamashita
Contributor II

I was troubled because LAN was not stable. Thanks and it worked.

Thank you for your help!

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xiangjun_rong
NXP TechSupport
NXP TechSupport

Hi,

I think the hardware connection is okay. But pls check that the pin24 of KSZ8081 is Reset pin, you should connect a RC circuit as the FRDM-K64. For the connector of Ethernet, Pls check if there should be serial resistor for the LEDG- and LEDG+.

Hope it can help you

BR

XiangJun Rong

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VilemZ
NXP Employee
NXP Employee

Hi,

thanks for your reply. When I compare schematic with FRDM k64F, then I don't see any RC circuit on the pin24 of KSZ8081. 

And serial resistor for the LEDG can't affect detection of cable. And I think, that it is clear.

Best Regards,

Vilem

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