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title="數(shù)據(jù)采集系統(tǒng)">數(shù)據(jù)采集系統(tǒng)" title="數(shù)據(jù)采集系統(tǒng)">數(shù)據(jù)采集系統(tǒng)" title="數(shù)據(jù)采集系統(tǒng)">數(shù)據(jù)采集系統(tǒng)" title="數(shù)據(jù)采集系統(tǒng)">數(shù)據(jù)采集系統(tǒng)" title="數(shù)據(jù)采集系統(tǒng)">數(shù)據(jù)采集系統(tǒng)" title="數(shù)據(jù)采集系統(tǒng)">數(shù)據(jù)采集系統(tǒng)" title="數(shù)據(jù)采集系統(tǒng)">數(shù)據(jù)采集系統(tǒng)的設計,比較了目前常用的各種數(shù)據(jù)傳輸方式,介紹了各個公司的PCI接口芯片" title="接口芯片">接口芯片的特點,以及高速數(shù)據(jù)采集系統(tǒng)的設計思想和各種實現(xiàn)方案。

　　關(guān)鍵詞: USB 火線(FireWire)? 低壓差分(LVDS)? HOTLink PCI? 數(shù)據(jù)采集? 遠程傳輸

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　　數(shù)據(jù)采集是信息處理系統(tǒng)的最前端,對于一般的數(shù)據(jù)采集任務有通用的數(shù)據(jù)采集系統(tǒng)可供選用。但是由于數(shù)據(jù)源以及用戶需求的多樣性,通用的采集設備不可能總能滿足定制要求。例如一個項目需要采集由一塊高速CCD圖像處理板送來的數(shù)據(jù),數(shù)據(jù)傳輸速率必須穩(wěn)定到10Mbytes/s,數(shù)據(jù)源為一個遠端(50m左右)設備發(fā)送的連續(xù)數(shù)據(jù)流,要求所設計的數(shù)據(jù)采集系統(tǒng)必須能夠現(xiàn)場采集,遠程傳輸,并實時地存儲海量數(shù)據(jù)。

　　本系統(tǒng)的核心部分為高速遠距離傳輸和數(shù)據(jù)采集兩個部分。

1 數(shù)據(jù)傳輸方案

　　在數(shù)據(jù)傳輸部分的設計中,調(diào)研了基于USB、火線(FireWire)之類的解決方案。采用這些協(xié)議開發(fā)設備可以使數(shù)據(jù)采集部分的設計比較簡單。目前,主板一般都支持USB1.1,不需要設計專門的數(shù)據(jù)采集卡。如果采用火線(FireWire)協(xié)議,TI的OHCI-lynx系列的芯片(TSB12LV23)集成了一個PCI接口和火線的協(xié)議層。但是目前USB1.1標準還達不到所需要的帶寬,而USB2.0還沒有得到主板的普遍支持。采用火線雖然使得數(shù)據(jù)接收端" title="接收端">接收端的設計相對簡單。但是由于火線是一條多主的總線,每發(fā)送一幀數(shù)據(jù)都要打一個包頭,由于鏈路層協(xié)議的復雜,包頭的結(jié)構(gòu)也相當?shù)娜唛L,對于數(shù)據(jù)發(fā)送端鏈路層的大量寄存器配置,僅用CPLD實現(xiàn),調(diào)試麻煩,不靈活。如果采用MCU來實現(xiàn)能夠?qū)ι习費bps的數(shù)據(jù)流實時地打包的數(shù)據(jù)發(fā)送系統(tǒng),復雜程度太高,嚴重影響項目進度。

　　依據(jù)開發(fā)難度、成本,最后選擇了兩種方案來構(gòu)建傳輸系統(tǒng):低壓差分(LVDS)和HOTlink。

　　低壓差分信號傳輸器件一般應用于背板信號互連之類的短距離通訊中,例如交換機系統(tǒng)。LVDS標準定義傳輸距離為10m,實際工程實踐中發(fā)現(xiàn)10Mbps的數(shù)據(jù)流在五類雙絞線上使用低壓差分至少可以在40m左右的傳輸距離穩(wěn)定傳輸。目前國內(nèi)的應用中一般在超過100m的情況下使用一個LVDS的中繼板。普遍使用的LVDS器件是國家半導體的90C031,90C032,1：1發(fā)送接收模塊,不帶有復用" title="復用">復用與解復用的功能。如果需要兩根串行線傳輸方案,國家半導體也提供復用比可達到14：1與1：14的復用與解復用LVDS器件。LVDS器件使用比較方便,不需要內(nèi)部編程與外部的邏輯控制,在PCB版圖設計時注意差分信號線基本等長、匹配電阻等問題即可正常工作。

　　HOTLink是Cypress公司的高速長距離點對點串行通信產(chǎn)品系列。符合DVB-ASI、ATM、SMPTE-259M、ESCON等標準,用于構(gòu)建符合這些標準的通訊產(chǎn)品的物理層。標準的HOTlink產(chǎn)品數(shù)據(jù)傳輸速率范圍為160～400Mbps,支持同軸電纜、雙絞線以及光纖接口。傳輸距離與傳輸介質(zhì)有關(guān)。用雙絞線以及同軸電纜可以傳輸100~500m,光纖傳輸可以達到數(shù)公里。具體工作原理是:在發(fā)送端將八位輸入數(shù)據(jù)串行輸出,接收端重新組合。發(fā)送端無有效數(shù)據(jù)時自動發(fā)送空數(shù)據(jù),接收端根據(jù)碼流自動恢復時鐘。外部邏輯可以監(jiān)視恢復時鐘是否失同步,一旦失同步即可控制接收端重新同步時鐘,而且HOTLink產(chǎn)品的一大特點是可以實現(xiàn)數(shù)據(jù)流與指令流的分離。HOTLink的理論誤碼率為零,實際誤碼來自于內(nèi)部時鐘失同步以及外部環(huán)境電磁干擾。

　　HOTink第二代產(chǎn)品可以支持1500Mbps的傳輸速率,支持8位、16位、32位數(shù)據(jù)接口,性能大大提高。當然基于HOTLink設計通訊產(chǎn)品難度相對要大一些,應用HOTLink傳輸系統(tǒng)需要比較復雜的外部狀態(tài)機的控制來保證接收端時鐘正確恢復(一個演示的狀態(tài)轉(zhuǎn)換圖見圖1)。而且由于系統(tǒng)時鐘頻率較高,PCB版圖設計需要比較講究,要求設計者仔細考慮各種電磁干擾影響。

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2 數(shù)據(jù)采集系統(tǒng)方案

　　基于計算機的數(shù)據(jù)采集系統(tǒng)可以依據(jù)與計算機的接口不同而分類。以目前工程應用來看,基于ISA總線的系統(tǒng)雖然帶寬足夠低速采集使用,但是由于主板生產(chǎn)商趨向于不再支持ISA,面臨被USB接口產(chǎn)品取代的趨勢。而高速數(shù)據(jù)采集系統(tǒng)主要還是基于PCI總線傳輸數(shù)據(jù)。這主要是由于PCI總線相對于其它總線有以下幾個優(yōu)點:

　　·PCI總線得到了廣泛的支持;

　　·PCI總線目前32Bit,33MHz時鐘,理論帶寬133Mbytes/s,可升級到64Bit,66MHz時鐘頻率;

　　·PCI總線產(chǎn)品開發(fā)有豐富的硬件資源可供選擇(常見產(chǎn)品比較見表1);

　　·PCI設備驅(qū)動開發(fā)在常見平臺下有較好的軟件包支持。例如Dos下可直接調(diào)用PCIBios函數(shù),Windows下有非常好的開發(fā)輔助軟件包,而Linux直接提供類似于PCIBios的函數(shù)可供開發(fā)者調(diào)用。

目前市場上常見的有AMCC、PLX、CYPRESS等公司的橋芯片。經(jīng)過一段時間的使用與比較,各個型號的PCI接口芯片的大致特點如表1所示。

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　　一般來說，基于PCI總線的板卡可以分成信息處理板與數(shù)據(jù)采集板。對于二者的設計思想以及相應的PCI接口芯片的選擇也有所不同。數(shù)據(jù)采集系統(tǒng)一般為了采集數(shù)據(jù)流而設計。由于PCI總線是一個共享總線,仲裁算法一般是公平競爭,事實上132Mbytes/s的峰值速率僅僅是一個理想值。實際中要想穩(wěn)定可靠地采集數(shù)據(jù)流,采集卡上必須有大小合適的緩存。數(shù)據(jù)采集系統(tǒng)從數(shù)據(jù)源到PC的整個體系是一個先進先出結(jié)構(gòu),核心問題是如何經(jīng)濟有效地設計出盡可能大的先進先出的緩存系統(tǒng)。最簡單的實現(xiàn)方式是直接使用FIFO器件作為系統(tǒng)的緩存,當然這也是最昂貴的方案。也可以使用雙口RAM來實現(xiàn)FIFO結(jié)構(gòu)。最廉價的方案是使用SRAM與雙路選擇器以及地址發(fā)生器實現(xiàn)大FIFO陣列。付出的代價使整個系統(tǒng)設計的復雜程度提高。

　　一般的PCI總線信號處理卡(顯示卡,聲卡等)的總線部分設計重點在于如何將卡上的設備映射到系統(tǒng)的內(nèi)存空間中去。常見的PCI接口芯片提供了PCI端總線與卡上局部端總線相互轉(zhuǎn)換的能力。而在數(shù)據(jù)采集卡的設計中,卡上的FIFO顯然只能作為一個端口訪問,設計者的任務是實現(xiàn)一個恰當?shù)目刂七壿?使得FIFO可以被PCI接口芯片的DMA控制器訪問。在現(xiàn)有的PCI接口芯片里面,AMCC5933直接提供了FIFO接口,實現(xiàn)數(shù)據(jù)流采集的控制邏輯最為簡單。PLX等公司的PCI接口芯片則沒有提供特定的引腳來提供外部FIFO訪問能力,需要一個專門的接口邏輯來進行邏輯轉(zhuǎn)換。下面的例子是PLX9054與FIFO的接口邏輯連接圖，可以幫助理解這種系統(tǒng)的設計(見圖2)。

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　　選擇PLX公司的芯片的好處是價格相對于AMCC5933便宜,型號眾多,可以根據(jù)不同的需求選擇適當?shù)男吞?比較靈活,而且提供了SDK幫助開發(fā)Windows下的驅(qū)動程序。但是FIFO的接口邏輯部分添加了一定的工作量,不如AMCC5933來得簡便易用。設計者應該根據(jù)自己具體項目的要求來選擇。

　　高速率的數(shù)據(jù)采集系統(tǒng)在采集數(shù)據(jù)流時最常見的問題是數(shù)據(jù)丟失,采集后數(shù)據(jù)流不完整。為了在系統(tǒng)調(diào)試中檢驗這個問題,在系統(tǒng)設計時加入一個自校正碼源,使得系統(tǒng)有自檢功能。

　　在系統(tǒng)中,為了驗證多大的緩存可以保證數(shù)據(jù)流的連續(xù)采集,讓數(shù)據(jù)源發(fā)送端發(fā)送自增長的測試碼流。經(jīng)過反復測試表明,在接收一個連續(xù)的數(shù)據(jù)流時,10Kbytes左右大小的FIFO緩存可以穩(wěn)定不丟失地采集10Mbytes/s左右的數(shù)據(jù)流。但是為了整個計算機系統(tǒng)的穩(wěn)定性考慮,建議在可能的情況下盡量用大的緩存。當然,對于數(shù)據(jù)的實時分析要求較高的領域,太大的緩存會引入延時的問題，這時候就要求權(quán)衡使用了。

3 主機主控軟件

　　主控程序核心分為兩個工作線程。一個線程負責管理PCI數(shù)據(jù)采集設備的驅(qū)動,調(diào)用PLX SDK函數(shù)將DMA中斷采集來的數(shù)據(jù)流從核心態(tài)的小緩存中以乒乓方式拷貝到用戶層的兩個大的緩存中;一個線程則從用戶層的緩存中讀取數(shù)據(jù)送入SCSI硬盤。采用這種管理機制,可以有效地實現(xiàn)海量數(shù)據(jù)的實時硬盤存取。

　　高速遠程數(shù)據(jù)傳輸系統(tǒng)在特定的工程中有廣泛的應用,如航空航天、核物理數(shù)據(jù)采集等等。這種應用領域的特殊性決定了不可能形成一個普適方案,設計者必須根據(jù)具體項目要求加以選擇設計。合理地加以選擇,可以在特定的應用領域中快速有效地完成系統(tǒng)設計。目前整個系統(tǒng)達到了設計的預期目標,工作穩(wěn)定。

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參考文獻

1 Interfacing PCI2040 to TMS320VC5420 DSP(SCPA030.pdf). TI公司

2 IOP480 to Synchronous FIFO (iop480_sfifo_an.pdf).PLX公司

3 PLX9054 User Manual. PLX公司