Difference between fft and dsphdl.FFT.

I am trying to convert FFT code to HDL, but the problem is that fft function is not supported and dsphdl.FFT is supported. So what is the difference between them?

Answer 1

[Hassaan]

The main differences between fft and dsphdl.FFT in MATLAB are:

Context:

• fft: General-purpose function for computing the FFT in software.
• dsphdl.FFT: Designed for generating HDL code for FPGA/ASIC implementations, optimized for hardware.

Implementation:

• fft: Uses optimized algorithms for software execution, supporting various data types.
• dsphdl.FFT: Employs hardware-friendly architectures like Streaming Radix 2^2 and Burst Radix 2, managing resources and latency for hardware execution.

Customization:

• fft: Straightforward use without much control over internal processes.
• dsphdl.FFT: Offers extensive control signals and configuration options for synchronization and data flow in hardware systems.

Data Handling:

• fft: Processes data directly, assuming it fits in memory.
• dsphdl.FFT: Handles streaming data and vectorized inputs, optimized for real-time hardware processing.

Performance:

• fft: Provides accurate results suitable for most software applications.
• dsphdl.FFT: Optimized for performance in hardware, with trade-offs in precision and latency to fit FPGA/ASIC constraints (MathWorks) (MathWorks) (MathWorks) (MathWorks) (MathWorks).

[Jaykishan Solanki]

Thank you very much @Hassaan, this was helpful.

[Hassaan]

@Jaykishan You are welcome.

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