After a state structure has been created, it can be used as many
times as required to simulate the FFT core. A simulation is run using the second function,
xilinx_ip_xfft_v9_1_bitacc_simulate. Call this function with the pointer to
the existing state structure and structures that hold the inputs and outputs of the C model.
The input structure members are shown in the following table.
| Member | Type | Description |
|---|---|---|
| nfft | int | Transform length |
| xn_re | double* | Pointer to array of doubles: real part of input data |
| xn_re_size | int | Number of elements in xn_re array |
| xn_im | double* | Pointer to array of doubles: imaginary part of input data |
| xn_im_size | int | Number of elements in xn_im array |
| scaling_sch | int* | Pointer to array of ints containing scaling schedule |
| scaling_sch_size | int | Number of elements in scaling_sch array |
| direction | int | Transform direction: 1=forward FFT, 0=inverse FFT (IFFT) |
The notes under the following headings apply to the inputs structure.