Analog Devices SHARC ADSP-214 Series

FFT Accelerator
6-10 ADSP-214xx SHARC Processor Hardware Reference
Special coefficient buffer
Re(SP_CF[0]), Im(SP_CF[0]), -Im(SP_CF[0]), Re(SP_CF[0]),
Re(SP_CF[1]), Im(SP_CF[1]), -Im(SP_CF[1]), Re(SP_CF[1]),
..........
Re(SP_CF[N-1]), Im(SP_CF[N-1]), -Im(SP_CF[N-1]), Re(SP_CF[N-1])
(4N words).
Where,
Re(CF[x]) = Real part of the complex coefficient CF[x],
Im(CF[x]) = Imaginary part of the complex coefficient CF[x],
Re(SP_CF[x]) = Real part of special complex coefficient SP_CF[x],
Im(SP_CF[x]) = Imaginary part of special complex coefficient SP_CF[x],
n = vxH + h, n = 0,1
…
N-1
CF x[] W
N
x
=
SP
CF n[]
W
N
vh×
0
H1–

0
V1–

=
nvHh+×=
n 0,1...N 1–=
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