The free version of VEC643 tools often excludes models for the ADC (Analog-to-Digital Converter) and DAC front-ends. You can simulate the DSP core, but you cannot simulate the analog input/output.
Universities often have site licenses for high-end DSP tools. If your institution subscribes to a software suite that supports VEC643 (e.g., MATLAB's DSP System Toolbox with specific hardware support packages), you can use it for free as a student.
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Instead of calculating sine/cosine in real-time (which consumes free-tier CPU credits), preload a LUT into the VEC643's local memory.
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The VEC643 thrives on Single Instruction, Multiple Data (SIMD). In your free simulator, avoid scalar processing.