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1、III·基于FPGA的LED顯示接口電路設(shè)計摘要LED顯示器廣泛應(yīng)用于交通、證券、電信、廣告和宣傳領(lǐng)域,它具有壽命長、功耗低、亮度高、驅(qū)動簡單、響應(yīng)速度快,且可隨意拼裝等優(yōu)點?,F(xiàn)在市場上諸多廣告牌LED視頻屏造價過于昂貴,刷新頻率較低,單色屏的顯示功能又過于單一,大多需要上位機(jī)對顯示過程進(jìn)行實時控制,并且對于大屏幕的系統(tǒng)性能有待提高。針對以上問題本文討論了利用FPGA與單片機(jī)相結(jié)合的方法控制實現(xiàn)多路點陣列顯示的技術(shù),以FPGA芯片為核心,其基于FPGA的雙口RAM配置和驅(qū)動控制電路設(shè)計成功地解決了傳統(tǒng)LED大屏幕設(shè)計中控制系統(tǒng)復(fù)雜、可靠性差的
2、問題。文中給出了系統(tǒng)的軟、硬件實現(xiàn),介紹了其設(shè)計思想、層次結(jié)構(gòu),在QUARTUSⅡ平臺下,利用編程和圖形文件結(jié)合的方法實現(xiàn)了軟件設(shè)計,經(jīng)波形仿真驗證后,得到了RTL電路連接。實踐證明,該系統(tǒng)工作正常,達(dá)到了預(yù)期的功能。關(guān)鍵詞:LED點陣列,F(xiàn)PGA控制器,VHDL,雙口RAMIII·TheRealizationofLEDDisplayInterfaceCircuitBasedonFPGAABSTRACTLEDdisplayhasmanyadvantage,suchaslonglifetime,lowpowerconsuming,highbri
3、ghtness,canbeeasilydriving,quickinrespondencespeed,andcanbeeasilyassembledandsoon.Butnowadays,LEDdisplaydeviceinmarketisveryexpensive,abitlowerinrefurbishingfrequencyanddisplayfunctionofone-colouredscreenistoounitary.mostneedthesuperiormachinetocarryonthereal-timecontroltot
4、hedemonstrationprocess.largescreen'ssystemperformancearestillneedtoenhance.DiscussedthemethodcontrolwhichinviewofcurrentsituationthisarticleunifiedusingFPGAandthemonolithicintegratedcircuittorealizethemulti-channelspotarraydemonstrationtechnology,takingtheFPGAchipasthecore.
5、pairofmouthRAMandCircuitdesignofscanningcontrollerwhicharebasedonFPGAsolvesthecontrolsystemtobecomplexandbadreliableprobleminthetraditionalLEDlargescreensuccessfully.Inthearticle,itgavestherealizationofsystem'ssoftwareandhardware.Thetextintroducesitsdesignidea,thelayerstruc
6、ture.UndertheQUARTUSII,usingthetexteditorandpicturefiletocombineandcareoutthesoftwaredesign.Afterverificationofwageforeimitate,hardwareelectriccircuitisrealized.Inpractice,Thissystemworksnormally,Thedisplaycharactersshowaccurateandstable.KEYWORDS:LEDarray,FPGAcontrolle,VHDL
7、,doublemouthRAM目錄III·摘要IIABSTRACTIII1緒論11.1FPGA的概述11.1.1FPGA的發(fā)展11.1.2FPGA的應(yīng)用21.2FPGA的設(shè)計流程31.3FPGA的設(shè)計優(yōu)勢41.4面向FPGA的EDA開發(fā)流程52LED72.1LED顯示屏的發(fā)展72.1.1LED顯示屏的國內(nèi)發(fā)展現(xiàn)狀82.1.2LED顯示屏的發(fā)展趨勢92.2LED顯示屏的結(jié)構(gòu)及其示意圖102.3LED顯示屏的種類及特性103LED電路顯示原理123.1LED點陣顯示結(jié)構(gòu)123.2LED點陣顯示模塊的顯示原理133.3LED點陣屏的顯示原理143.
8、4顯示系統(tǒng)掃描程序軟件設(shè)計154方案選擇164.1總體方案164.2外圍電路連接184.3模塊設(shè)計204.3.1雙口RAM存儲單元配置204.3.2FPGA的驅(qū)動電