[Nexys4 DDR ethernet]

Thanks Sam, I will try it. 

[Nexys4 DDR ethernet]

Hi Sam,

Thanks for you explanation, It is very helpful. I think I have got some knowledge about the MicroBlaze and LwIP.

This morning I researched the c language codes of the echo_server project. Found that the data come in the server by a function defined as tcp_recved(), and then echo back by a function defined as tcp_write(). When the data get in the server, it seems to be saved in a buffer automatically. There is no control parameter in  tcp_recved(). But in the write function tcp_write(), there is a input parameter p->payload to indicate that from where begin to send out the data.

So I think if I want to instead of sending back the echo, I can modify the input data of the tcp_write(). But here comes the questions. 

1. How can I connect the data from Pmod to the input data of tcp_write(). The SDK seems totally be separated with the FPGA board. So Do I need add the Pmod port in the Vivado? The function tcp_write() always get data from the buffer, so if I add the Pmod, how can I put the data in the buffer, and how to control the pointer p->payload point to the location where my data is at.

2. I want to know is there a reference manual about how to use the SDK functions, it is not easy to figure out the meanings of all the functions and parameters used in the project.

[Nexys4 DDR ethernet]

Recently, I'm working with the Nexys4 DDR. What I want to do is to control a peripheral device and get data from it via PMOD port, and then send the data to the PC from Ethernet port. By learning the tutorials, now I can get the data and save the data to DDR, and fetch the data from DDR via UART. However, for several days, I can not make the ethernet work. I have studied the tutorial "Getting Started with Microblaze Servers". When I finished the tutorial, I still don't know how to use it in my own project. Actually, I  even don't understand what the purpose of each step of the tutorial. The reference manual says the PHY can be accessed only by using two IP core, ati_ethernetlite and mii_to_rmii . So I am confused that why this tutorial looks like so complicated. And I want to know is there any simple tutorials or examples about the ethernet control? I am a beginner of the FPGA program, please forgive my stupid questions.