The UltraLong FFT core from Dillon Engineering is engineered for transforming massive data lengths that overshoot the internal memory capacities of FPGAs and ASICs. By partitioning the FFT process, results are stored in external memories, necessitating multiple transformations that require three transpose operations and additional processing stages. This broadens the applications of FFTs beyond conventional limits, particularly where large data throughput is essential while retaining efficiency in logic usage. The UltraLong FFT core is devised with an adaptable architecture, supporting various memory strategies and resource-sharing options. Its performance is optimized based on external memory bandwidth, with SRAM technologies typically offering superior throughput while SDRAM solutions allow for the longest FFT stretches. Dillon Engineering ensures these cores maximize efficiency aligned with the available memory architectures at hand, guaranteeing suitable solutions for voluminous data processing needs.