描述

當一個塊中有一位或更多位不能正確操作時，就定義此塊為無效塊。無效塊并不影響其他塊的正常工作，各個塊之間是相互獨立的。所選的K9F2G08U0M在出廠時可能存在無效塊，在使用中也可能產生新的無效塊，但是器件的第一個塊一定不是無效塊。NANDFlash在出廠時就標記本身的無效塊，每個塊的第一頁或第二頁的空閑區(qū)的第一個數(shù)據(jù)不是FFh，則表示此塊為無效塊。為了保證Flash的正確操作，必須在操作之前建立無效塊信息表。在每片F(xiàn)PGA中設計了4個2048×1bit的RAM用于存儲無效塊的信息。RAM的每一個存儲單元存儲相應總線上的4組Flash的無效塊信息。其中某一塊的無效塊信息是4組Flash的無效塊信息相“與”后的結果(1表示正常，0表示無效塊)。在對Flash進行讀、寫或擦除操作之前，應先從RAM中讀取無效塊信息，然后根據(jù)無效塊信息決定是否對當前塊操作。

歐美品牌停產的，常用的“PLC”備品備件

我司產品應用于以下領域：

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算機控制系統(tǒng)》

7,《電氣控制系統(tǒng)》造紙,印染生產線,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，機器人系統(tǒng)配件，大型伺服系統(tǒng)備件。

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