描述

當(dāng)一個(gè)塊中有一位或更多位不能正確操作時(shí)，就定義此塊為無(wú)效塊。無(wú)效塊并不影響其他塊的正常工作，各個(gè)塊之間是相互獨(dú)立的。所選的K9F2G08U0M在出廠時(shí)可能存在無(wú)效塊，在使用中也可能產(chǎn)生新的無(wú)效塊，但是器件的第一個(gè)塊一定不是無(wú)效塊。NANDFlash在出廠時(shí)就標(biāo)記本身的無(wú)效塊，每個(gè)塊的第一頁(yè)或第二頁(yè)的空閑區(qū)的第一個(gè)數(shù)據(jù)不是FFh，則表示此塊為無(wú)效塊。為了保證Flash的正確操作，必須在操作之前建立無(wú)效塊信息表。在每片F(xiàn)PGA中設(shè)計(jì)了4個(gè)2048×1bit的RAM用于存儲(chǔ)無(wú)效塊的信息。RAM的每一個(gè)存儲(chǔ)單元存儲(chǔ)相應(yīng)總線上的4組Flash的無(wú)效塊信息。其中某一塊的無(wú)效塊信息是4組Flash的無(wú)效塊信息相“與”后的結(jié)果(1表示正常，0表示無(wú)效塊)。在對(duì)Flash進(jìn)行讀、寫或擦除操作之前，應(yīng)先從RAM中讀取無(wú)效塊信息，然后根據(jù)無(wú)效塊信息決定是否對(duì)當(dāng)前塊操作。

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(dòng)化控制系列

本特利，英維思，伍德沃德，福克斯波羅、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(lè)，ACSO，力士樂(lè)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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