Sundance FC100 v.2.3 - Manual (Page 10)

FC100 - Floating Point Fast Fourier Transform
v2.3
Fast Fourier Transform product manual
October 2005 www.sundance.com - 10 -
Resources usage and performances
The following table summarizes the resources usage and performances of a 24-bit
mantissa, 8-bit exponent floating point FFT/IFFT core.
Device Slices Multipliers 18x18
Block RAMs
18Kb
Fmax
Virtex-4
XC4VLX40 -12
12394 40 36 200.2 MHz
Virtex-II Pro
XC2VP40 -7
12293 40 36 175 MHz
Spartan-3
XC3S4000-5
12835 40 36 105.3 MHz
Table 6 : Core resources usage
The FFT/IFFT processing time with an FPGA internal clock running at 200MHz is
shown in the table below.
FFT/IFFT transform size Processing time Sustained throughput
in MSPS
256 3.68µs 69.6
512 6.24µs 82.1
1024 11.4µs 90.1
2048 31.8µs 64.3
4096 61.4µs 66.7
8192 123µs 66.7
16384 246µs 66.7
32768 492µs 66.7
65536 1.31ms 50.0
131072 2.62ms 50.0
262144 5.24ms 50.0
524288 10.5ms 50.0
1048576 21ms 50.0
Table 7: Core performances