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TM4C1294NCPDT: design help

user5624527
Intellectual 800 points
Part Number: TM4C1294NCPDT
Other Parts Discussed in Thread: CC1310

Hello,
For our product, we require ethernet and so  we have used TM4C1294 MCU
The firmware was developed using TM4C1294 launchpad. A custom board was made keeping the launchpads design as reference.
The problem is whenever we run any example based on ethernet, we are not getting IP address for the custom board. We have tried running sample examples given by TI( both TI RTOS and Non RTOS), for launchpad it works fine, but for the custom board we dont get the IP address.
In designing we have taken care of line impedence, straight path, we have also used a ethernet connector with build in magnetics.
We have posted the same issue on e2e forum, but couldn't find solution.
We will send the design files via mail or can upload the same.

Attached is the schematic and layout of our custom board. 
Please review the design. 
Also in layout you can see CC1310 being used, cc1310 is working fine. Please ignore CC1310 part. 

Please take this issue with highest priority.SCD20171211.brd.pdfSCD20171211.sch.pdf
Thank you

  • 0
    TI__Guru 72500 points

    Hi K.K.

    I really cannot do a design review of a customer's board layout and schematic. I can answer specific questions about how to use our TM4C devices. If you need a true design review, I suggest you look for a reputable consultant in your area.

    I did notice in your schematic that it looks like you connected the TRJ19111DNL chassis ground tabs to the board ground. Notice in the design reference (http://www.ti.com/lit/ug/spmu365c/spmu365c.pdf) that these two grounds are isolated with a 1M Ohm resistor in parallel with a 4700pF capacitor as shown below: