FPGAs are scalable, monolithic arrays of programmable logic building
blocks - logic cells - combined with programmable interconnect resources.
The four input look-up table architecture of logic cell is particularly
useful for DSP algorithms. It can be used for either arithmetic or distributed
memory , the two basic DSP requirements.
4th generation FPGAs also incorporate many DSP friendly features:
Distributed RAM for FIR filter data buffers
Block RAM for FFT buffers
Shift registers for distributed arithmetic and serial arithmetic
Multiply ãANDä gate for efficient high speed parallel multipliers
DLL for generating multi-rate clocks for decimating and interpolating
filters
