Transform Size - 9.1 English - PG109

Fast Fourier Transform LogiCORE IP Product Guide (PG109)

Document ID
PG109
Release Date
2024-11-13
Version
9.1 English

The transform point size can be set through the NFFT field in the Configuration channel if the runtime configurable transform length option is selected. Valid settings and the corresponding transform sizes are provided in the following table. If the NFFT value entered is too large, the core sets itself to the largest available point size (selected in the IDE). If the value is too small, the core sets itself to the smallest available point size: 64 for the Radix-4 Burst I/O architecture and 8 for the other architectures.

Table 1. Valid NFFT Settings
NFFT[4:0] Transform size (N)
00011 8
00100 16
00101 32
00110 64
00111 128
01000 256
01001 512
01010 1024
01011 2048
01100 4096
01101 8192
01110 16384
01111 32768
10000 65536