ADSP-214xx SHARC Processor Hardware Reference 6-1
6 FFT/FIR/IIR HARDWARE
MODULES
Finite Impulse Response (FIR) filters are frequently used in DSP applica-
tions. With its high performance floating-point processing capabilities the
SHARC processors are uniquely designed for FIR filtering. The SIMD
SHARC core has two MAC units which provide 800 MIPS of processing
speed when the processor is running at 400 MHz. However, for high per-
formance applications, with their ever increasing complexity (such as
room equalization or surround sound), even more processing power is
needed.
To meet this need, the ADSP-214xx SHARC processors off load some of
the most frequently used and intensive processing into hardware accelera-
tors. An accelerator dedicated for filter processing can reduce the
instruction processing load on the core, freeing it up for other tasks.
The FIR/IIR/FFT accelerator units are capable of performing the filters
and FFT without core intervention. This gives software developers enor-
mous freedom to use core processing cycles to implement complex
algorithms, effectively adding more instructions per second to the
processor.
The accelerator modules (FFT/FIR/IIR) each have local memory
which is not accessible by the core during regular operation mode.
The interface specifications are shown in Table 6-1.
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