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TM4C1294NCPDT: Cannot ping TM4C1294NCPDT by using Router PING Test

Part Number: TM4C1294NCPDT

Hello everyone,

We are developing an app what communicate by TM4C1294NCPDT with LAN or WIFI,

however, it returns 'Timeout' from Ping Result when PING TM4C1294NCPDT via Router Ping Test,

we also tested on iOS / MacOSX through PING apps, but it's same result.

Besides, we have developed on TM4C1294 LaunchPad Evaluation Board perviously, iOS / MacOSX devices can PING it without any issues , even the router ping test works perfect.

We have no idea that why PING from Router Ping Test is failed and iOS / MacOSX devices cannot PING the designed board (TM4C1294NCPDT) and this board is based on Evaluation Board's design.

Could it be a layout problem or something?

We would very much appreciate a suggest to the article or a maybe an answer to this question.

Attached is the circuit diagram what we design.

  • Hi Kim,

    Please see below example ethernet interface schematic. You can find the same in the datasheet or in the TM4C129 system design guideline. One thing I didn't see in your schematic is the connection for RBIAS pin. How did you connect the RBIAS pin. You must have RBIAS pin connected to GND through a 4.87kohm resistor. 

    Can you try several experiments for me?

     - Can you ping the LaunchPad on your network now? I want to make sure it is not your network problem.

     - Can you run one of the TivaWare ethernet examples on your custom board? We know the TivaWare examples are proven to work. If they work on your custom board then it may be your software issue. 

      - Can you run whatever Ethernet application you current have on your custom board and let it run on the LaunchPad? Will the LaunchPad work?

      - Can you confirm if your device on the custom board has the MAC address programmed? Your device must have a MAC address. A virgin device shipped from the factory does not have the MAC address. 

      - When you said your board doesn't work, can you elaborate what and where it fails? 

      - Please check your RBIAS connection as mentioned earlier. 

      - Please review the datasheet and TM4C129 system design guideline on the ethernet interface. I notice that in your schematic you have 0.1uF cap on the differential signals (EN0TXOP, EN0TXON, EN0RXIP, EN0RXIN). However, in the datasheet the cap is 0.1mF. While I don't think this difference will be the cause of your problem, it will be good to know your rationale choosing a different cap.