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What do you mean by the ROM FAST? Are you asking about the FPU32 Fast tables or the CPU Fast Data ROM, or something else? If it's the FPU32 Fast tables, these are just math tables used within the library (stored on ROM for easy use), it's not a separate library.
For the FPUfastRTS library there is a user guide within C2000Ware located at C2000Ware_4_XX_XX_XX\libraries\math\FPUfastRTS\c28\docs. Let me know if this is not the library that you are looking for.
