PFBK 164
廈門莫格電氣自動化有限公司是一家專業(yè)提供工業(yè)自動化領域的備件服務商,產(chǎn)品品種齊全、價格合理,公司實力雄厚,重信用、守合同、保證產(chǎn)品質(zhì)量,以多品種經(jīng)營特色和薄利多銷的原則,贏得了廣大客戶的信任。
我們主營PLC可編程控制器模塊,DCS卡件,ESD系統(tǒng)卡件,振動監(jiān)測系統(tǒng)卡件,汽輪機控制系統(tǒng)模塊,燃氣發(fā)電機備件等,公司致力于為工業(yè)用戶提供自動化解決方案,打造工控備件一站式供應平臺。
我們與世界的多家PLC,DCS產(chǎn)品維護服務供應商建立了緊密的合作關系。能直接從境外進貨、能夠提供不同國別、廠商的設備以及備件、包括一些停產(chǎn)的老系統(tǒng)備件,解決您多處尋找的麻煩或?qū)Ξa(chǎn)品質(zhì)量問題的擔心等,在價格上我們有很大的優(yōu)勢、產(chǎn)品詳細信息、竭誠歡迎您來電查詢或使用 查詢!
我們售出的備品備件均提供一年的質(zhì)量保證、并且都經(jīng)過了嚴格的測試和認證,現(xiàn)已成一家性的工業(yè)自動化備件及零部件的銷售企業(yè)。
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公司經(jīng)銷產(chǎn)品廣泛應用于數(shù)控機械 冶金、石油天然氣、石油化工、化工、造紙印刷、紡織印染、機械、電子制造、汽車制造、煙草、塑膠機械、電力、水利、水處理/環(huán)保、市政工程、鍋爐供暖、能源、輸配電等行業(yè)
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(a)配置成16位復用地址/數(shù)據(jù)總線的工作方式
(b)配置成8位非復用地址/數(shù)據(jù)總線的工作方式
(4)片內(nèi)EPROM 片內(nèi)256k位的EPROM,可配置為32k×8或16k×16,為優(yōu)化地址譯碼而劃分為8個相等的可映射存儲塊,每個存儲塊結(jié)構(gòu)為4k×8或2k×16,由PADA的輸出ES0~ES7來選擇。存儲器的訪問時間為90ns,包括輸入鎖存和PAD地址譯碼的時間。
(5)片內(nèi)RAM 片內(nèi)16k靜態(tài)RAM:可配置為2k×8或1k×16,由PADA的輸出RSO來選擇。它的訪問時間也為90ns,包括輸入鎖存和PAD地址譯碼的時間。
(6)片內(nèi)加密 可實現(xiàn)PSD3系列芯片的配置加密和PAD的譯碼加密。由于傳統(tǒng)的硬件電路是由散件構(gòu)成,通過測試單個器件,比較容易破譯電路的設計。而PSD3系列芯片的高度集成和本身的加密功能使得電路和程序無法破譯。
其余的PSD系列芯片在功能上比PSD3更強,主要表現(xiàn)在I/O引腳的增多、EPROM、SRAM容量的擴充和PLD的輸入、輸出與乘積項上。如:PSD503,I/O引腳有40個,PLD的輸入有61個,乘積項有140個,中斷有8級,定時器/計數(shù)器有4個,EPROM有1M,SRAM有16k,且?guī)в泻髠潆姵?。再如:PSD813F1是在系統(tǒng)可編程器件,無需硬件編程器,可實現(xiàn)整個芯片內(nèi)的所有功能塊的配置和程序EPROM的寫入。
4、應用實例
例1:目前,8031系列單片機應用特別廣泛,使用PSD312與8031構(gòu)成單片機的硬件核心。8031用信號訪問PSD312中程序存儲器,用讀寫PSD312的數(shù)據(jù)存儲器。將PSD312的程序存儲器配置成8個8k×8的存儲塊,數(shù)據(jù)存儲器配置成一個2k×8的存儲塊。因為地址譯碼空間為64k,所以PC0、PC1、PC2配置成I/O端口,不作A16、A17、A18之用。又因為8031是以8位數(shù)據(jù)/地址復用方式工作的,所以,將PSD312配置成8位數(shù)據(jù)/地址復用工作方式,此時端口A也配置成I/O端口。
例2:在數(shù)字信號處理領域中,微控制器TMS320系列芯片的應用很廣泛,使用PSD100芯片作為TMS320C25的外圍接口芯片,以此構(gòu)成用于數(shù)字信號處理方面的單片機的核心電路,比以前用散件構(gòu)成要簡單得多。PSD100是數(shù)字信號處理器(DSP)的外圍接口芯片,它是非數(shù)據(jù)/地址復用型,可與8位或16位數(shù)據(jù)總線的微控制器相接,內(nèi)有128k位的EPROM,32k位的SRAM,存儲器訪問時間為32ns。在圖3中,PSD100配置成八個1k×16的EPROM。兩個1k×16的SRAM。TMS320C25用PS選擇PSD100的程序存儲器。用DS選擇PSD100的數(shù)據(jù)存儲器。由于PSD100沒有專門引腳用作片內(nèi)EPROM的讀脈沖輸入(不同于PSD3XX系列芯片),這對PSD100來說,其程序和數(shù)據(jù)存儲器在同一存儲空間,所以,將PS連接到A18,將DS連接到A17,使用不同的地址空間映射,來選擇程序和數(shù)據(jù)存儲器。
5、結(jié)束語
現(xiàn)在,PSD系列芯片的功能和優(yōu)點尚未被許多人所認識,大多數(shù)人還習慣于用散件來構(gòu)造單片機外圍電路,這種思維方法必將隨著PSD系列芯片的普及應用而發(fā)生改變。
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