说明：  Field programmable gate arrays (FPGAs) are emerging in many areas of high performance computing, either as tailor made signal processor, embedded algorithm implementation, systolic array, software accelerator or application specific architecture. FPGAs are so flexible and reconfigurable that they are capable of massively parallel operations, explicitly tailored to the problem at hand. There are lot of paradigms to put FPGAs at work in a high performance computing environment There are number of limitations which restrict FPGAs to reach the performance of Application Specific Integrated Circuits (ASICs) but they provide the possibility of changing the hardware design easily while outpacing software implementations on general purpose processors.