描述

1)寫入命令，通知器件所要完成的操作(讀、寫、擦除等)；

2)寫入地址，即寫入要讀寫數(shù)據(jù)的起始地址，包括列地址和頁地址；

3)如果是讀或者擦除，寫入一個確認命令。如果是寫操作，輸人待編程的數(shù)據(jù)，完成后輸入編程確認命令。

因為K9F2G08U0M共有128K頁，每頁的大小為(2048+64)×8bit，所以在寫入地址時列地址需要12根地址線，頁地址需要17根地址線。這樣就需要5個時鐘周期來寫入地址。前兩個時鐘寫入列地址，后三個時鐘寫人頁地址。

3系統(tǒng)設(shè)計

3.1總體硬件設(shè)計

外部數(shù)據(jù)采集系統(tǒng)是2個40MHz采樣的16位A／D通道，所以設(shè)計時分成兩個通道獨立設(shè)計。雖然K9F2G08U0M的數(shù)據(jù)寄存器寫入速度可達33MB／s，但在FPGA設(shè)計時，為了在時序上更加可靠，選擇使用25MHz的時鐘設(shè)計，則K9F2G08U0M的寫入速度為50MB／s(把兩個K9F2G08U0M并成16bit，寫入速度即為25M×l6b／s)。這樣，在FPGA內(nèi)部開辟3個頁大小的雙口RAM作為緩存區(qū)就能滿足40M×16b／s的寫入速度，即在寫第2、3個RAM的時間(25ns×2048×2=102.4μs)內(nèi)，啟動第1個RAM把數(shù)據(jù)寫

入Flash的數(shù)據(jù)寄存器，所需時間為40ns×2048=81.92μs，小于102.4μs。

在讀回數(shù)據(jù)時，如以20MHz讀取Flash，以40MHz讀出緩沖區(qū)中的數(shù)據(jù)，3個雙口RAM就能剛好滿足要求，如圖1。讀取K9F2G08U0M一頁數(shù)據(jù)能達到33MHz的速度，為了讓讀寫Flash使用同一時鐘，讀Flash也采用25MHz的速度。同時為了增加系統(tǒng)設(shè)計的冗余，采用4頁的雙口RAM作為緩沖區(qū)。所以每片F(xiàn)PGA內(nèi)部至少需要4×2048×16bit=”131″072bit的存儲空間。

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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