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LS1021A - RGMII eTSEC3, no 125MHz on EC3_GTX_CLK

Question asked by Greg Davis on Feb 3, 2016
Latest reply on Feb 3, 2016 by Greg Davis

I have an LS1021A board designed by our customer that is configured for RGMII eTSEC3 using the same PHY (AR8033) as LS1021A-TWR board and connected exactly the same as the LS1021A-TWR board. Good 1Gbps link on Ethernet port. U-boot reports "Speed: 1000, full duplex" but fails ping with "not alive".

 

On LS1021A-TWR observe 125MHz clock on EC3_GTX_CLK when transmitting (ping from u-boot with "alive").

 

On LS1021A board (not tower) there is no 125MHz clock on EC3_GTX_CLK when trying to transmit (ping from u-boot). There is activity on the EC3_GTX_CLK signal but it does not look like a clock (i.e., not 125MHz, 25MHz, or 2.5MHz clock).

 

I have not been able to find what is causing this yet.

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