Horizontal Fft - Analog Devices SHARC ADSP-214 Series Hardware Reference Manual

3. Third iteration:
a. Input coeff DMA from special coeff buffer[512] (offset =
1024)
b. Input DMA from special buffer[256] (offset = 512)
c. FFT computation
d. Output DMA to special buffer[256] (offset = 512)
4. Fourth iteration:
a. Input coeff DMA from special coeff buffer[512] (offset =
1536)
b. Input DMA from special buffer[256] (offset = 768)
c. FFT computation
d. Output DMA to special buffer[256] (offset = 768)

Horizontal FFT

1. Input coeff DMA from horizontal coeff buffer[32]
2. Input data DMA from special buffer[1024] (modifier = 2V, circbuf
= 2N)
3. FFT computation
4. Output DMA to Output Buffer[1024] (modifier = 2V,
circbuf = 2N)
This FFT generates a total of six partial FFT computations. Each compu-
tation has an input and output DMA which results in 12 interrupts.
ADSP-214xx SHARC Processor Hardware Reference
www.BDTIC.com/ADI
FFT/FIR/IIR Hardware Modules
6-13