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1G/10Gbps Ethernet PHY IP Core can't work for 1Gbps rate transmission

Altera_Forum
Honored Contributor II
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Hello guys, 

 

I encountered a problem that I can't use the 1G/10Gbps Ethernet PHY IP Core for 1Gbps rate transmission. I use loopback mode. When I set this core "SEQ Force Mode" register as 10GBASE-R, I can transmit and receive data correctly under 10Gbps rate. But when I set it as GigE, this core fail. From logic analyzer I found the signals have been sent to the input data port "gmii_tx_d", but I can't get any signals on output port "gmii_rx_d". 

 

Does anyone run into the same problem? Please give me some clue or advice.  

 

Thanks
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