為實現(xiàn)尺寸較大、內(nèi)部結構較為復雜的星載電子設備的多余物自動檢測，設計了以EZ-USB FX2和CPLD芯片為核心器件的數(shù)據(jù)采集卡，實現(xiàn)了四通道的同步數(shù)據(jù)采集和傳輸。此系統(tǒng)包括數(shù)據(jù)采集、數(shù)據(jù)緩存以及數(shù)據(jù)控制和傳輸，分別采用了采樣率為500 k 的12位A/D轉(zhuǎn)換器件AD7892、16 k×18位的FIFO CY7C4265、EPM7064和USB芯片CY7C68013。重點介紹了數(shù)據(jù)采集系統(tǒng)的硬件組成和軟件設計，包括USB的固件程序、CPLD的控制程序和主機用戶程序。實驗結果表明，該系統(tǒng)能達到穩(wěn)定傳輸速度為15.4 MB/s，保證了四通道同時以500 k的采樣率工作的穩(wěn)定性和正確性。

　　Abstract:

　　In order to implement the remainder auto-detection of large and complex electric equipment in the satellite， a four-channel data acquisition card is designed based on EZ-USB FX2 and the CPLD in the paper. It realizes the function of the synchronous data acquisition and transmission. The system includes data collection， data caching， data control and transmission， respectively using A/D conversion device AD7892 with 12-bit， 500 k sampling rate， 16k×18bit FIFO CY7C4265， EPM7064 and USB chip CY7C68013. This paper focuses on hardware and software design about the data acquisition system， including the USB firmware， CLPD control program and the host user program. Experimental results show that the stable data transmission speed of the system is 15.4MB/s， which ensure the stability and validity.