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Triple Mac Ethernet in SGMII mode for custom board

Vikas_bel
Beginner
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Good Evening All

 

I am using the triple mac ethernet in SGMII mode.  Auto negotiation works fine but after 19 bytes excluding pre-amble and SFD , the ip core enters in invalid frame length error . As soon as the next ethernet packet is received, same thing repeats . What can be the issue . I am using UDP for sending data .I tried with different lengths as well. I am attaching the signal tap snapshot file as well . Bottom signal is ff_rx_data(8 bit fifo is used)once it receives the 08 00,4500 , it enters invalid  frame length error. signal tap attached as wellSignal tap imageSignal tap image 

 

Regards

Vikas Kumar

Deputy Manager

RFMW,PDIC

Bharat Electronics Limited

Bangalore

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