Mistake in preamble and SDF in sending package?
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mvo...@googlemail.com
Sep 29, 2017, 6:09:18 AM9/29/17
to opencores-tri-mode eth MAC
Hi there,
During my work with the IP-Core I have made some simulations with ModelSim.
I found out, that the preamble and the SFD at the frame for the sending process is the wrong way round when you compare it with the Ethernet standard.
Instead of 7 bytes 10101010 the core generates 01010101 and for the SFD it generates 11010101 instead of 10101011.
Also the core doesn't accept Ethernet frames with the normal preamble and SFD, it just take frames with the wrong way round beginning of the frame.
I have downloaded the core in March this year, maybe this problem is already fixed or maybe this doesn't matter for the function of the core
and my mistake is somewhere else.
I attach a picture of the signal from the preamble and SFD.
best regards,
Michael
During my work with the IP-Core I have made some simulations with ModelSim.
I found out, that the preamble and the SFD at the frame for the sending process is the wrong way round when you compare it with the Ethernet standard.
Instead of 7 bytes 10101010 the core generates 01010101 and for the SFD it generates 11010101 instead of 10101011.
Also the core doesn't accept Ethernet frames with the normal preamble and SFD, it just take frames with the wrong way round beginning of the frame.
I have downloaded the core in March this year, maybe this problem is already fixed or maybe this doesn't matter for the function of the core
and my mistake is somewhere else.
I attach a picture of the signal from the preamble and SFD.
best regards,
Michael
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