No communication: MicroBlaze with AXI Ethernet Subsystem with DMA on Nexys4 DDR

[bklopp]

I made a post on the Xilinx forums but did not receive an answer. I was wondering if you guys could help me out. 

Click to see my post

Thanks.

[bklopp]

I figured out the problem. The AXI Ethernet Subsystem is not compatible with the Nexys 4 DDR, since the PHY on that board is not a gigabit PHY, so it requires a RMII interface, while the AXI Ethernet Subsystem can only support RGMII or GMII.

 

I purchased a nexys video board, which has a gigabit PHY that supports RGMII and is therefore compatible with the AXI Ethernet subsystem.

[jpeyron]

Hi @bklopp,

I do not have much experience with using the ethernet subsystem. We do have a getting started with microblaze servers tutorial for the Nexys Video that might be helpful for your project. This tutorial uses the ethernet subsystem.  I would also look at the AXI 1G/2.5G Ethernet Subsystem v7.0 Product Guide as well as the AXI DMA v7.1 LogiCORE IP Product Guide. 

thank you,

Jon