針對目前低電壓等級的繼電保護(hù)以及測控裝置對數(shù)據(jù)采集的高精度、低成本的要求，提出一種多路同步數(shù)據(jù)采集系統(tǒng)的設(shè)計(jì)方案。該方案采用MPC8313為主控制器，CS5451A為模數(shù)轉(zhuǎn)換器，通過對CS5451A Master模式串口輸出時(shí)序以及FIFO讀寫時(shí)序的研究，在CPU和CS5451A之間設(shè)計(jì)了一個串并轉(zhuǎn)換模塊實(shí)現(xiàn)采樣數(shù)據(jù)的接收，數(shù)據(jù)接收后存入FIFO緩沖區(qū)，這樣解決了利用處理器SPI接口直接接收數(shù)據(jù)CPU占用率高的矛盾。

Abstract:

?In consideration of the requirement of data acquision precision and low cost in the design of relay protection relay unit and measuring-control unit recently，a synchronous multi-channel data acquision system was designed and implemented. The design took MPC8313 as control unit and took CS5451A as AD converter.Through the study of the output timing of Master-mode serial interface and the timing of asynchroronous FIFO，it designed a serial-parallel conversion module and asynchroronous FIFO by using FPGA produced by XILINX corporation.After reception，the sampling data was stored in FIFO.Thus，it solved the problem of the high occupancy rate of CPU when used the SPI interface of CPU direct receiption of sampling data.

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