Analog Devices SHARC ADSP-214 Series Hardware Reference Manual page 306

FFT Accelerator
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,
= Real part of the complex coefficient
Re(CF[x])
= Imaginary part of the complex coefficient
Im(CF[x])
= Real part of special complex coefficient
Re(SP_CF[x])
= Imaginary part of special complex coefficient
Im(SP_CF[x])
n = vxH + h, n = 0,1
...
N-1
6-10
www.BDTIC.com/ADI
CF x [ ]
W
=
V 1 – H 1 –
 
SP
=
CF n [ ]
0 0
×
n v H
= +
n = 0,1...N 1
ADSP-214xx SHARC Processor Hardware Reference
,
CF[x]
CF[x]
SP_CF[x]
x
N
×
v h
W
N
h
–
,
,
,
SP_CF[x]