User Guide Table Lists Wrong Bit Growth for Variable Streaming Fixed Point Architecture

Description

For variable streaming fixed point architecture, the bit growth is log₂(max(fftpts)) 1. This bit growth is listed correctly in "Variable Streaming Architecture", on page 3-3 of the FFT MegaCore Function v11.0 User Guide. However, the note to Table 3-4 incorrectly lists the bit growth that is correct in versions that precede the Quartus II software v11.0.

This issue affects all FFT MegaCore function variable streaming fixed point variations.

This issue has no design impact.

Resolution

Use the bit growth formula on page 3-3 of the user guide instead of the formula in the note to Table 3-4.

This issue will be fixed in a future version of the FFT MegaCore Function User Guide.