描述

總線接口模塊主要的功能是轉(zhuǎn)換AMBA總線上的控制和數(shù)據(jù)信號：將總線上的數(shù)據(jù)送入FIFO或?qū)?shù)據(jù)從FIFO讀出到總線上，將總線上的控制信號轉(zhuǎn)換時序后送到控制模塊。

NAND控制器包含一個寬度為32b，深度為4的緩沖FIFO，用于解決高速總線與低速設(shè)備之間數(shù)據(jù)傳輸速度的匹配問題。為提高總線的傳輸效率，以及控制器設(shè)計的便利性，NANDFLASH在總線上的數(shù)據(jù)傳輸采用DMA的方式來完成。譬如在讀取FLASH一頁數(shù)據(jù)時，數(shù)據(jù)持續(xù)寫入控制器FIFO，F(xiàn)IFO滿時發(fā)出DMA傳輸?shù)恼埱?，同時暫停FLASH的數(shù)據(jù)讀取，控制信號nRE拉高，直至DMA響應(yīng)請求即FIFO不滿時，F(xiàn)LASH的數(shù)據(jù)傳輸重新開始。當選擇應(yīng)用的FLASH位寬為8，頁大小為(512+16)B時，控制器需要發(fā)出(32+1)次4拍字寬度的DMA傳輸請求來完成數(shù)據(jù)和校驗信息的讀取。

控制模塊的上作主要是將總線接口轉(zhuǎn)換的控制信號，按照NANDFLASH的接口協(xié)議．將片選、地址、命令、讀寫使能按照所配置的時序要求，發(fā)送到NANDFLASH中，并且控制數(shù)據(jù)的傳輸個數(shù)，以及DMA請求、數(shù)據(jù)傳輸完成中斷、數(shù)據(jù)錯誤中斷等系統(tǒng)信號。

NANDFLASH可靠性相對較差，存儲器芯片中有壞塊的存在，會導(dǎo)致存儲數(shù)據(jù)出錯。ECC校驗?zāi)K針對NANDFLASH的可靠性問題，提供了一種查錯、糾錯的機制。ECC校驗碼在數(shù)據(jù)讀人時，由硬件計算完成后寫入到FLASH的校驗位中，當此頁數(shù)據(jù)讀出時，校驗碼再次生成與存儲器校驗位中的數(shù)據(jù)進行比較，若相同則沒有損壞位，若不同，則給出出錯中斷，軟件通過檢查比較結(jié)果，判斷出錯位的位置進行糾錯處理。糾錯功能僅針對單bit位的出錯，當一個以上位同時在一頁中出現(xiàn)時，ECC校驗不能給出出錯位正確的位置。

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算機控制系統(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，機器人系統(tǒng)配件，大型伺服系統(tǒng)備件。

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