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tiagogioni's avatar
tiagogioni
Icon for New Contributor rankNew Contributor
3 years ago

Simple connection betwenn two ethernet ports on DE2-115

Hi everyone! I'm trying to connect the two ethernet ports on DE2-115. Basically, I just want to bypass the signal between the two ports without any code/decode protocol. I'am trying to perform thi...
ak6dn's avatar
ak6dn
Icon for Regular Contributor rankRegular Contributor
3 years ago

Correct the DE2-115 is an old board, but it does have two complete etherNet PHY transceivers and RJ45 connectors, ETH0 and ETH1.

You are definitely going to want to get the full 88E1111 datasheet ...

https://www.marvell.com/content/dam/marvell/en/public-collateral/transceivers/marvell-phys-transceivers-alaska-88e1111-datasheet.pdf

... which will allow you to configure and program the device registers.

TerAsic only distributes the shorter 88E1111 product brief which only has the external electrical/pin connections, no register info.

tiagogioni's avatar
tiagogioni
Icon for New Contributor rankNew Contributor
3 years ago

Thanks a lot about yout attention!!

Yes! the board is a little old indeed... but it have the two ethernet ports as you said.

I alrealdy read the datasheet available but it is not really clear about how to perform those configurations. But still I think is no necessary do any changes on it... When I lunch the code into the board I can see I'am receiving data but I am not sending ... I think maybe is a problem with the TX clock or TX enable pins... any clues?