??? 摘? 要: 介紹了一種采用硬件控制的自動(dòng)數(shù)據(jù)采集系統(tǒng)" title="采集系統(tǒng)">采集系統(tǒng)的設(shè)計(jì)方法,包括數(shù)字系統(tǒng)自頂向下的設(shè)計(jì)思路、Verilog HDL對(duì)系統(tǒng)硬件的描述和狀態(tài)機(jī)的設(shè)計(jì)以及MAX+PLUSII開發(fā)軟件的仿真。設(shè)計(jì)結(jié)果表明:該采集系統(tǒng)具有很高的實(shí)用價(jià)值,極大地提高了系統(tǒng)的信號(hào)處理能力。?

????關(guān)鍵詞: 可編程邏輯器件? Verilog HDL? FIFO? FSM

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??? 隨著數(shù)字時(shí)代的到來(lái),數(shù)字技術(shù)的應(yīng)用已經(jīng)滲透到了人類生活的各個(gè)方面。數(shù)字系統(tǒng)的發(fā)展在很大程度上得益于器件和集成技術(shù)的發(fā)展,著名的摩爾定律(Moore’s Law)的預(yù)言也在集成電路的發(fā)展過(guò)程中被印證了,數(shù)字系統(tǒng)的設(shè)計(jì)理念和設(shè)計(jì)方法在這過(guò)程中發(fā)生了深刻的變化。從電子CAD、電子CAE到電子設(shè)計(jì)自動(dòng)化(EDA),隨著設(shè)計(jì)復(fù)雜程度的不斷增加,設(shè)計(jì)的自動(dòng)化程度越來(lái)越高。目前,EDA技術(shù)作為電子設(shè)計(jì)的通用平臺(tái),逐漸向支持系統(tǒng)級(jí)的設(shè)計(jì)發(fā)展;數(shù)字系統(tǒng)的設(shè)計(jì)也從圖形設(shè)計(jì)方法向硬件描述語(yǔ)言設(shè)計(jì)方法發(fā)展。可編程器件在數(shù)字系統(tǒng)設(shè)計(jì)領(lǐng)域得到廣泛應(yīng)用,不僅縮短了系統(tǒng)開發(fā)周期,而且利用器件的現(xiàn)場(chǎng)可編程特性,可根據(jù)應(yīng)用的要求對(duì)器件進(jìn)行動(dòng)態(tài)配置或編程,簡(jiǎn)單易行地完成功能的添加和修改。?

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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)" 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)是整個(gè)系統(tǒng)的核心部分之一,傳統(tǒng)方法是應(yīng)用MCU或DSP通過(guò)軟件控制數(shù)據(jù)采集的模/數(shù)轉(zhuǎn)換,這樣必將頻繁中斷系統(tǒng)的運(yùn)行從而減弱系統(tǒng)的數(shù)據(jù)運(yùn)算能力,數(shù)據(jù)采集的速度也將受到限制。因此,DSP+CPLD的方案被認(rèn)為是數(shù)字信號(hào)處理系統(tǒng)的最優(yōu)方案之一,由硬件控制模/數(shù)轉(zhuǎn)換和數(shù)據(jù)存儲(chǔ),從而最大限度地提高系統(tǒng)的信號(hào)采集和處理能力。?

1 系統(tǒng)總體方案?

??? 數(shù)據(jù)采集系統(tǒng)是基于DSP的信號(hào)處理系統(tǒng)中的一部分,框圖如圖1所示。該數(shù)字信號(hào)處理系統(tǒng)用于隨機(jī)共振理論在弱信號(hào)檢測(cè)中的應(yīng)用研究中。整個(gè)系統(tǒng)由信號(hào)放大、信號(hào)濾波、信號(hào)采樣、高速數(shù)字信號(hào)處理、與主計(jì)算機(jī)的高速數(shù)據(jù)傳輸接口等部分組成。其中,信號(hào)放大是對(duì)輸入信號(hào)進(jìn)行調(diào)理以滿足采樣的要求;信號(hào)濾波是防止信號(hào)產(chǎn)生“混疊現(xiàn)象”;信號(hào)采樣是完成模擬信號(hào)的數(shù)字化;高速數(shù)字信號(hào)處理是在建立隨機(jī)共振模型的基礎(chǔ)上完成各種算法;與主計(jì)算機(jī)的高速數(shù)據(jù)傳輸接口是滿足信號(hào)檢測(cè)的實(shí)時(shí)性,將DSP處理的數(shù)據(jù)傳給計(jì)算機(jī)以進(jìn)行進(jìn)一步的處理。?

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??? 基于Verilog HDL設(shè)計(jì)的自動(dòng)狀態(tài)機(jī)由硬件控制A/D" title="A/D">A/D轉(zhuǎn)換以及自動(dòng)向FIFO中存儲(chǔ)數(shù)據(jù),采樣頻率由DSP系統(tǒng)的輸出時(shí)鐘確定,當(dāng)采樣數(shù)據(jù)達(dá)到一幀時(shí),FIFO向DSP申請(qǐng)中斷,DSP系統(tǒng)啟動(dòng)DMA完成數(shù)據(jù)讀取。這期間數(shù)據(jù)采集不中斷,從而實(shí)現(xiàn)連續(xù)的實(shí)時(shí)數(shù)據(jù)采集和實(shí)時(shí)數(shù)據(jù)處理。數(shù)據(jù)采集系統(tǒng)由A/D芯片MAX196、邏輯控制芯片EPM7128、FIFO芯片CY7C425組成。控制邏輯用Verilog HDL語(yǔ)言描述,并進(jìn)行了仿真和實(shí)際驗(yàn)證。?

2 硬件電路設(shè)計(jì)?

2.1 A/D轉(zhuǎn)換芯片?

??? 系統(tǒng)A/D轉(zhuǎn)換由MAX196芯片實(shí)現(xiàn)。MAX196的特點(diǎn)為:?

??? ①12位A/D轉(zhuǎn)換精度,1/2 LSB線性度;?

??? ②單5V電源供電;?

??? ③軟件選擇模擬量輸入范圍,分別為:±10V、±5V、0～5V、0～10V;?

??? ④6模擬量輸入通道;?

??? ⑤6μs轉(zhuǎn)換時(shí)間,100ksps采樣速率;?

??? ⑥內(nèi)部或外部采樣控制;?

??? ⑦內(nèi)部或外部時(shí)鐘控制轉(zhuǎn)換。?

??? 在MAX196的控制字" title="控制字">控制字中:?

??? ①A2A1A0為通道選擇字:000～101分別代表通道0～5;?

??? ②BIP、RNG為輸入范圍和極性選擇;?

??? ③ACQMOD:采樣控制模式,0為內(nèi)部控制采樣,1為外部控制采樣;?

??? ④PD1、PD0為時(shí)鐘與省電模式選擇。?

??? 內(nèi)部轉(zhuǎn)換模式時(shí)序如圖2所示。當(dāng)向MAX196寫入包含通道選擇、量程選擇、極性選擇的控制字時(shí),完成A/D轉(zhuǎn)換的初始化。控制字的ACQMOD位用來(lái)選擇內(nèi)部轉(zhuǎn)換模式和外部轉(zhuǎn)換模式,當(dāng)寫入ACQMOD位為0的控制字時(shí),將啟動(dòng)內(nèi)部轉(zhuǎn)換模式,這里采用內(nèi)部采樣模式,一次轉(zhuǎn)換需要12個(gè)時(shí)鐘周期,轉(zhuǎn)換周期由芯片內(nèi)部時(shí)鐘確定。寫入一個(gè)寫脈沖可以啟動(dòng)一次轉(zhuǎn)換。當(dāng)在A/D轉(zhuǎn)換期間寫入新的控制字時(shí),將中止轉(zhuǎn)換并啟動(dòng)一次新的采樣周期。A/D轉(zhuǎn)換結(jié)束,輸出低電讀取A/D轉(zhuǎn)換結(jié)果并復(fù)位

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2.2 數(shù)據(jù)緩存器?

??? 系統(tǒng)采集的數(shù)據(jù)常常放在數(shù)據(jù)緩存器中。數(shù)據(jù)緩存區(qū)要求既要有與A/D芯片的接口,又要有與系統(tǒng)DSP的接口以提高數(shù)據(jù)吞吐率,因此常選用雙口RAM或FIFO。由于FIFO不需要地址尋址,為了簡(jiǎn)化控制信號(hào), 本模塊采用FIFO芯片CY7C425作為數(shù)據(jù)緩存區(qū)。FIFO存儲(chǔ)器允許數(shù)據(jù)寫入和讀出不依賴于數(shù)據(jù)速率,并且總是以寫入的順序讀出。根據(jù)Full和Empty標(biāo)志來(lái)判斷存儲(chǔ)器全滿或空。FIFO芯片可以進(jìn)行數(shù)據(jù)寬度和存儲(chǔ)深度的擴(kuò)展而不會(huì)增加額外的時(shí)間延遲。低電平時(shí)發(fā)生寫操作,作。A/D轉(zhuǎn)換的結(jié)果通過(guò)寫操作不斷存入FIFO中,當(dāng)FIFO滿時(shí),Full標(biāo)志有效,向系統(tǒng)申請(qǐng)中斷,DSP響應(yīng)中斷,立即啟動(dòng)DMA讀FIFO中的數(shù)據(jù),當(dāng)讀到空時(shí),Empty標(biāo)志有效,DSP停止讀入操作。采用兩片CY7C425擴(kuò)展為18位1024字的高速異步FIFO存儲(chǔ)器,數(shù)據(jù)處理速度達(dá)到50MHz,可以實(shí)現(xiàn)數(shù)據(jù)的高速寫入和高速讀出。FIFO異步讀寫時(shí)序見圖3。

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2.3 狀態(tài)機(jī)模塊?

??? 狀態(tài)機(jī)(FSM)完成自動(dòng)A/D轉(zhuǎn)換和數(shù)據(jù)存儲(chǔ),控制芯片是EPM7128SQC100。該狀態(tài)機(jī)由系統(tǒng)時(shí)鐘驅(qū)動(dòng),產(chǎn)狀態(tài)機(jī)能連續(xù)運(yùn)行,不斷地寫命令字以啟動(dòng)A/D轉(zhuǎn)換,然后讀出A/D的轉(zhuǎn)換結(jié)果并同時(shí)寫入FIFO。時(shí)序圖見圖4。?

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??? 復(fù)位時(shí),產(chǎn)生寫脈沖,芯片MAX196在的上升沿鎖存外部輸入的命令控制字,開始A/D轉(zhuǎn)換。當(dāng)A/D轉(zhuǎn)換結(jié)束時(shí),芯片變?yōu)榈碗娖?在下一個(gè)時(shí)鐘的上升沿,變?yōu)榈碗娖?數(shù)據(jù)總線上輸出數(shù)據(jù)。當(dāng)信號(hào)低電平有效時(shí),信號(hào)變?yōu)楦唠娖?下一個(gè)時(shí)鐘的上升沿,信號(hào)變?yōu)楦唠娖?在的上升沿?cái)?shù)據(jù)被鎖存進(jìn)FIFO。信號(hào)回到高電平后,信號(hào)變?yōu)榈碗娖?于是又開始下一次轉(zhuǎn)換。?

3 系統(tǒng)的Verilog HDL描述?

??? 電子系統(tǒng)設(shè)計(jì)中一般遵循自上而下的設(shè)計(jì)思路,對(duì)系統(tǒng)進(jìn)行設(shè)計(jì)、描述與仿真。考慮到模塊的通用性和可移植性,常常使用HDL語(yǔ)言來(lái)描述數(shù)字系統(tǒng),如Verilog HDL、VHDL、AHDL語(yǔ)言等。其中Verilog HDL語(yǔ)言具有結(jié)構(gòu)清晰、文法簡(jiǎn)明、功能強(qiáng)大、高速模擬和多庫(kù)支持等優(yōu)點(diǎn),被近90%的半導(dǎo)體公司使用,成為一種強(qiáng)大的設(shè)計(jì)工具。?

3.1 用Verilog HDL語(yǔ)言描述MAX196?

??? 用Verilog HDL程序描述MAX196模塊,可以把模塊用于采集系統(tǒng)的仿真,以驗(yàn)證狀態(tài)機(jī)設(shè)計(jì)的正確性。該模塊主要有三個(gè)輸入信號(hào)和一個(gè)輸出信號(hào),與芯片的控制信號(hào)是一致的。程序說(shuō)明如下:?

??? module adc(reset,rd_adc,wr_adc,int_adc);?

??? input reset,rd_adc,wr_adc;?

??? output int_adc;?

??? reg int_adc;?

??? always @(posedge wr_adc or negedge rd_adc or negedge reset)?

??? begin?

??????? if(!reset) int_adc=1;?

??????? else if(rd_adc==0) begin int_adc=1; end?

??????? else begin #10 int_adc=0; end? ?

??? end?

??? endmodule?

3.2 用Verilog HDL語(yǔ)言描述自動(dòng)狀態(tài)機(jī)?

??? 自動(dòng)狀態(tài)機(jī)有三個(gè)輸入信號(hào)和兩個(gè)輸出信號(hào),輸入信號(hào)中clk由DSP系統(tǒng)輸出以控制采樣速度,reset信號(hào)復(fù)位自動(dòng)狀態(tài)機(jī),int_adc是A/D芯片轉(zhuǎn)換結(jié)束的響應(yīng)信號(hào);輸出信號(hào)rd_adc、wr_adc控制A/D芯片的轉(zhuǎn)換開始和數(shù)據(jù)的讀出,以及控制FIFO將數(shù)據(jù)寫入FIFO。程序說(shuō)明如下:?

??? module fsm(int_adc,clk,reset,rd_adc,wr_adc);?

??? output rd_adc,wr_adc;?

??? input int_adc,clk,reset;?

??? reg rd_adc,wr_adc;?

??? reg[1:0] present;?

??? parameter reset_ad=2’h0,start_ad=2’h1,wait_ad=2’h2,read_ad=2’h3;?

??? always @(posedge clk or negedge reset)?

????????? if(~reset) begin present=reset_ad;rd_adc=1;wr_adc?

??????? ? =0;end?

??????? ? else?

??????? ? begin?

??????????? case(present)?

??????????? reset_ad:?? if(rd_adc)?

??????????????????????? begin present=start_ad;wr_adc=1;end?

??????????? start_ad:?? if(~int_adc)?

??????????????????? begin present=wait_ad;rd_adc=0;end?

??????????? wait_ad:??? if(~rd_adc)?

??????????????????? begin present=read_ad;wr_adc=0;end?

??????????? read_ad:??? if(int_adc)?

??????????????????? begin present=reset_ad;rd_adc=1;end?

??????????? endcase?

??????????? end?

??? endmodule?

3.3 數(shù)據(jù)采集系統(tǒng)?

??? MAX196模塊和狀態(tài)機(jī)模塊組成高層模塊——自動(dòng)采樣系統(tǒng),通過(guò)模塊實(shí)例的調(diào)用和端口映射語(yǔ)句實(shí)現(xiàn)模塊的組合。特別設(shè)定輸出信號(hào)int_adc,可使仿真波形看得更加清楚。程序說(shuō)明如下:?

??? module simuadc(clk,reset,rd_adc,wr_adc,int_adc);//系統(tǒng)模塊?

??? output rd_adc,wr_adc,int_adc;?

??? input clk,reset;?

??? reg rd_adc,wr_adc,int_adc;?

??? adc adcmax196(reset,rd_adc,wr_adc,int_adc);//A/D芯片模塊?

??? fsm fsmdsp(int_adc,clk,reset,rd_adc,wr_adc);//狀態(tài)機(jī)模塊?

??? endmodule?

3.4 仿真圖形?

??? 圖5為采集系統(tǒng)的時(shí)序仿真圖。CLK是系統(tǒng)外部時(shí)鐘,用于控制采樣頻率;RESET接外部復(fù)位信號(hào),可以控制采樣的起始時(shí)刻;MAX196的WR_ADC、RD_ADC、INT_ADC分別與邏輯芯片EPM7128的控制引腳相連接。仿真圖表明,復(fù)位后,只要有CLK時(shí)鐘輸出,A/D轉(zhuǎn)換將連續(xù)進(jìn)行,轉(zhuǎn)換數(shù)據(jù)依次存入FIFO,當(dāng)FIFO滿時(shí),向DSP發(fā)出中斷請(qǐng)求,DSP及時(shí)響應(yīng)并啟動(dòng)DMA高速讀入FIFO中的值,由于DSP讀入的速度足夠快,因此A/D轉(zhuǎn)換并不需要停頓,從而實(shí)現(xiàn)實(shí)時(shí)采樣和實(shí)時(shí)處理。

?

?

??? 本文提出的自動(dòng)采集系統(tǒng)采用CPLD芯片,用硬件描述語(yǔ)言設(shè)計(jì)自動(dòng)狀態(tài)機(jī),實(shí)現(xiàn)硬件控制數(shù)據(jù)采集和存儲(chǔ)。目前采集系統(tǒng)應(yīng)用于DSP應(yīng)用板卡上,免去了DSP監(jiān)控A/D芯片的時(shí)間,使信號(hào)處理系統(tǒng)能高效地完成復(fù)雜的隨機(jī)共振系統(tǒng)的研究。實(shí)際應(yīng)用證明該采集系統(tǒng)工作非常穩(wěn)定,若采用更高數(shù)據(jù)轉(zhuǎn)換速度的A/D芯片、頻率更高的系統(tǒng)時(shí)鐘,可以進(jìn)一步提高系統(tǒng)的數(shù)據(jù)采集速度。?

參考文獻(xiàn)?

1 王志華,鄧仰東.數(shù)字集成系統(tǒng)的結(jié)構(gòu)化設(shè)計(jì)與高層次綜合.?北京:清華大學(xué)出版社,2000.7?

2 Donald E. Thomas, Philip R. Moorby. The Verilog(r)??Hardware Description Language.Kluwer Academic Publishers?Fourth Edition, 1998?

3 WWW.MAXIM-IC.COM?

4 WWW.ALTERA.COM