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TM4c1294 network 120MHz clock

Roberto Romano
Guru 27285 points

 Hi, I am experiencing some trouble running processor @120MHz, after few tens of second or sometime few minutes it crash and restart.

 This was known on early silicon revision, is still necessary reduce speed to 70-80Mhz to run networked application?

 Environment:

 tm4c1294NCPD TT3 54A3HOW G4 on custom board, code is TIRTOS UDP echo unpatched or with FPGA and LCD init, all version crash after some time @ full speed when network got enabled.

 This time I am busy many fold so inspection was delayed to 3/4rd week of october when I get back to TIVA code, for now I just lowered clock, if application don't require more performance I left @70MHz.

  • 0
    TI__Guru**** 244400 points
    Hello Roberto,

    Yes , the issue is with Ethernet PHY initialization and requires that the core be run with prefetch disabled. The core can still work at 120MHz with prefetch disabled and once PHY intialization is done prefetch buffer re enabled for performance.

    Regards
    Amit