描述
3.5PCI9054操控部分的設(shè)計(jì)
通過編寫PCI9054專用的驅(qū)動和應(yīng)用軟件,實(shí)現(xiàn)由計(jì)算機(jī)通過CPCI總線操控存儲板卡。在應(yīng)用軟件中,對Flash讀寫或者擦除等命令自定義為對CPCI總線發(fā)送特定的數(shù)據(jù)。而在FPGA內(nèi)部根據(jù)PCI9054發(fā)送的局部端數(shù)據(jù)線上的特定數(shù)據(jù)判斷是何種操作,并執(zhí)行相應(yīng)操作。FPGA和PCI9054通信的主要信號線有LHOLD、LHOLDA、READY、ADS、ADDR、DATA,利用這些信號線可以實(shí)現(xiàn)PCI9054局部端和FPGA握手。將數(shù)據(jù)寫到計(jì)算機(jī)中。在PCI9054專用的驅(qū)動和應(yīng)用軟件中,利用DMA方式讀取Flash,讀取速度可提高至1.3MHz×16bit。
4結(jié)束語
本設(shè)計(jì)采用流水、并行處理技術(shù),利用FPGA內(nèi)部嵌入的存儲塊設(shè)計(jì)一組高速數(shù)據(jù)緩沖區(qū),使得多個慢速的存儲器件并行工作,令系統(tǒng)內(nèi)外部數(shù)據(jù)的速率匹配,避免了外置高速緩存,簡化了硬件電路,且極大地提高了存儲數(shù)據(jù)的速率。大容量高密度閃存器件可使單片存儲板容量高達(dá)128Gbit。在FP-GA內(nèi)部設(shè)計(jì)中,建立Flash無效塊信息列表,并在此基礎(chǔ)上對Flash進(jìn)行讀、寫、擦除及重建無效塊信息等操作。使系統(tǒng)具有集成度高、靈活性好、可移植性強(qiáng)、速度快等特點(diǎn)。通過CPCI總線采取DMA方式讀取,極大地提高了讀取速度。當(dāng)接收到的數(shù)據(jù)帶寬很大,速度很高時,可將存儲板并聯(lián)起來,多個存儲板級聯(lián)可滿足更大的存儲容量需求,也可將級聯(lián)并聯(lián)二者結(jié)合起來以滿足不同系統(tǒng)的要求。整個系統(tǒng)基于CPCI工控機(jī)箱,更適合于野外的工作環(huán)境,并能及時保存、分析數(shù)據(jù)。
歐美品牌停產(chǎn)的,常用的“PLC”備品備件
我司產(chǎn)品應(yīng)用于以下領(lǐng)域:
1,《發(fā)電廠DCS監(jiān)控系統(tǒng)》
2,《智能平鋼化爐系統(tǒng)制造》
3,《PLC可編程輸送控制系統(tǒng)》
4,《DCS集散控制系統(tǒng)》
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5,《智能型消防供水控制系統(tǒng)》
6,《化工廠藥液恒流量計(jì)算機(jī)控制系統(tǒng)》
7,《電氣控制系統(tǒng)》造紙,印染生產(chǎn)線,變電站綜合自動化控制系列
本特利,英維思,伍德沃德,??怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂,ACSO,力士樂等各大品牌的DCS系統(tǒng)配件,機(jī)器人系統(tǒng)配件,大型伺服系統(tǒng)備件。
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