3RX9 503-0BA00
3RX9 503-0BA00
3RX9 503-0BA00
———偏門的備品備件聯(lián)系我們——————
頻譜監(jiān)控、信號分析、光達(dá)信號采集、光纖測試、雷達(dá)及衛(wèi)星信號收集等應(yīng)用，屬于典型高速及高精確度數(shù)據(jù)采集應(yīng)用。這些應(yīng)用對工程師們最大的挑戰(zhàn)就是要如何滿足高帶寬的系統(tǒng)需求。本文將分享以PXI Express平臺在建構(gòu)高帶寬系統(tǒng)時所需要考慮的細(xì)節(jié)，例如數(shù)字化儀或波型產(chǎn)生器的板載內(nèi)存、PXI Express機箱內(nèi)的PCIe信號架構(gòu)、計算機操作系統(tǒng)、內(nèi)存及儲存裝置的選擇。
簡介
傳統(tǒng)桌面型儀器的數(shù)據(jù)傳輸接口為GPIB、RS-232或是LAN，這些接口的好處在于非常容易操作使用，但在傳輸大量數(shù)據(jù)時其效率并不理想。當(dāng)要采集大量連續(xù)數(shù)據(jù)時，數(shù)據(jù)長度就會因為內(nèi)部存儲器大小而受限。目前市面上新款的高級儀器，例如示波器、波型發(fā)生器或邏輯分析儀，采用x86的架構(gòu)，因此在高速、大量數(shù)據(jù)采集的長度上則基本上沒有限制。但若要跨儀器同步達(dá)到多通道采集時，便是個困難且復(fù)雜的課題。
自從1998年第一版的PXI規(guī)格問世后，PXI平臺與其模塊已經(jīng)被大量應(yīng)用于軍工、電子制造及科學(xué)研究應(yīng)用中。第一版的PXI規(guī)格采用了PCI總線的高速傳輸特性，而后續(xù)的PXI規(guī)范更采用了PCI Express總線，繼承了其低延遲(Low Latency)、高帶寬及點對點傳輸?shù)奶匦?，另外再加上特有的觸發(fā)與時序同步的接口，使得PXI平臺與PXI模塊特別適合應(yīng)用于高速數(shù)據(jù)傳輸。
當(dāng)以PXI平臺設(shè)計適用于高速數(shù)據(jù)記錄的系統(tǒng)，不管是將數(shù)據(jù)連續(xù)由模塊化儀器傳送至系統(tǒng)內(nèi)存或存儲裝置，
數(shù)據(jù)記錄系統(tǒng)的架構(gòu)及其考量因素
下圖一簡單的示意了一組PXI Express平臺中數(shù)據(jù)的流向，組成的組件包含了PXI Express機箱、PXI Express控制器及模塊化儀器，包含數(shù)字化儀及波形發(fā)生器。以高速數(shù)字化儀為例，模擬信號被ADC采集轉(zhuǎn)換成數(shù)字量數(shù)據(jù)后，會搬移到板載內(nèi)存上暫存，接下來再經(jīng)由總線控制器及PCI Express接口，
———冷門的備品備件聯(lián)系我們——————
———停產(chǎn)的備品備件聯(lián)系我們——————
福建光沃自動化設(shè)備有限公司
聯(lián)系人 ：歐工（銷售經(jīng)理）
手機 ：18030229053
電話 ：0592-5709825
QQ ：2479261344
郵箱 ：2479261344@qq.com
傳真 ：0592-5917519
信用=財富 誠信=財富 共贏=財富
或者相反的數(shù)據(jù)流向，都能夠利用PXI Express的高速總線、點對點傳輸?shù)奶匦砸约疤赜械挠|發(fā)與時序信號，輕松地完成實現(xiàn)。接下來的文章內(nèi)容將進(jìn)一步討論，在設(shè)計、實現(xiàn)數(shù)據(jù)記錄系統(tǒng)的過程中，需要考慮的幾個要點與方向。
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