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Firstly, usual design methods of asynchronous serial interface board are introduced briefly, and defects of the methods are put forwarded, then the original design method and it's technical superiorities based on FPGA state-machine and bus-on-chip are expounded emphatically, then the performances of asynchronous serial interface board based on above design method are clarified. By comparing test data about time of response delay, obvious difference on processing rate between asynchronous serial interface boards based on FPGA state-machine and DSP processor are presented, and by comparing above two design methods, cause for the difference on processing rate are paraphrased. In the end, the opinion that FPGA state-machine is superior over any DSP processor evidently in performance to manage memorizer and port on exterior bus, and a suggestion of design method for similar equipment or system are put forward.