Hi Felix, The section "text_tcm" which is placed in the TCMA memory, consists majorly of the time critical functions in the PROFINET FWHAL. As shared in your first screenshot, t he keyword 'FAST_CODE_HWAL' is appended to most function definitions in the PROFINET FWHAL, and the corresponding text for these functions is stored in TCMA memory . This speeds up the execution time of these functions and also provides better performance in high traffic load situations. Kindly let us know if you have any follow-up questions Regards, Laxman
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