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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(shè)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(shè)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(wù)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(shè)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(shè)備發(fā)送的連續(xù)數(shù)據(jù)流,要求所設(shè)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(shè)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(shè)備可以使數(shù)據(jù)采集部分的設(shè)計比較簡單。目前,主板一般都支持USB1.1,不需要設(shè)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(biāo)準(zhǔn)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(shè)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(fù)雜,包頭的結(jié)構(gòu)也相當(dāng)?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(fù)雜程度太高,嚴(yán)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(yīng)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(biāo)準(zhǔn)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(yīng)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(dǎo)體的90C031,90C032,1：1發(fā)送接收模塊,不帶有復(fù)用" title="復(fù)用">復(fù)用與解復(fù)用的功能。如果需要兩根串行線傳輸方案,國家半導(dǎo)體也提供復(fù)用比可達到14：1與1：14的復(fù)用與解復(fù)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(shè)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(biāo)準(zhǔn),用于構(gòu)建符合這些標(biāo)準(zhǔn)的通訊產(chǎn)品的物理層。標(biāo)準(zhǔn)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(fù)時鐘。外部邏輯可以監(jiān)視恢復(fù)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(dāng)然基于HOTLink設(shè)計通訊產(chǎn)品難度相對要大一些,應(yīng)用HOTLink傳輸系統(tǒng)需要比較復(fù)雜的外部狀態(tài)機的控制來保證接收端時鐘正確恢復(fù)(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(shè)計需要比較講究,要求設(shè)計者仔細(xì)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(yīng)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(shè)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(shè)計思想以及相應(yīng)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(shè)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(shè)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(dāng)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(shè)計的復(fù)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(shè)計重點在于如何將卡上的設(shè)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(shè)計中,卡上的FIFO顯然只能作為一個端口訪問,設(shè)計者的任務(wù)是實現(xiàn)一個恰當(dāng)?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(shè)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(dāng)?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(shè)計者應(yīng)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(shè)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(fù)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(dāng)然,對于數(shù)據(jù)的實時分析要求較高的領(lǐng)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(fù)責(zé)管理PCI數(shù)據(jù)采集設(shè)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(yīng)用,如航空航天、核物理數(shù)據(jù)采集等等。這種應(yīng)用領(lǐng)域的特殊性決定了不可能形成一個普適方案,設(shè)計者必須根據(jù)具體項目要求加以選擇設(shè)計。合理地加以選擇,可以在特定的應(yīng)用領(lǐng)域中快速有效地完成系統(tǒng)設(shè)計。目前整個系統(tǒng)達到了設(shè)計的預(yù)期目標(biāo),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