Analog Devices SHARC ADSP-214 Series - FFT Accelerator

ADSP-214xx SHARC Processor Hardware Reference 6-3
FFT/FIR/IIR Hardware Modules
FFT Accelerator
The FFT accelerator (shown in Figure 6-1) implements radix-2 complex
floating-point FFT. The accelerator’s data and twiddle coefficient inter-
face is designed to connect to the processor’s DMA engine (acting like a
peripheral) and implements a synchronous pipeline read/write protocol
with a pipeline depth of 1.
Figure 6-1. FFT Block Diagram
CORE PMD/DMD
BUS
IOD0
BUS
FFT
COMPUTE
UNIT
(Complex
Butterfly)
COEFF
ACCESS
CONTROL
DATA
ACCESS
CONTROL
C
O
E
F
F
I
C
I
E
N
T
S
FFT CONTROL
REGISTERS
DMA
CONTROLLER
FFT CONTROLLER
OUTPUT
BUFFER
INPUT
BUFFER
D
A
T
A
256x4
256x2
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