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.
Note: For native
floating-point and Fixed-point SSR>1 implementations, the runtime configurable
transform length is not supported. Transform length needs to be specified at design-time
via GUI options.
| 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 |