leeson M1145018.00

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描述

leeson M1145018.00

移動NAND閃存式存儲器件(如microSD卡或e.MMC嵌入式解決方案)的讀寫性能一般以MB/s為單位，這一性能也被稱為序列性能。在側(cè)載(side-load)的情況下，這點非常重要，比如將存儲器件與大型多媒體文件互相同步。e.MMC器件的性能因制造商而異，例如，iNANDExtremee.MMC器件具有杰出的序列性能，寫入速度最高可達(dá)50MB/s，讀取速度最高可達(dá)80MB/s(圖2)。
? ? 存儲器優(yōu)化移動用戶體驗
? ? 有時人們常常忽視性能的另一個方面，那就是在考慮高級移動操作系統(tǒng)和應(yīng)用程序時具有重要意義的隨機(jī)性能。隨機(jī)性能一般以IOPS(每秒輸入/輸出操作次數(shù))為單位，體現(xiàn)的是存儲器件對極小數(shù)據(jù)包(一般為4KB-8KB)讀寫操作的處理能力，這種操作在移動操作系統(tǒng)、文件系統(tǒng)和應(yīng)用程序后臺被經(jīng)常和反復(fù)執(zhí)行。存儲器件對應(yīng)用程序存取操作的反應(yīng)速度會影響應(yīng)用程序的啟動時間，網(wǎng)絡(luò)瀏覽和電子郵件等應(yīng)用的響應(yīng)速度，甚至器件的“瞬時啟動”功能。
? ? 在NAND存儲器件中實現(xiàn)高速的隨機(jī)性能并非易事，因為原始NAND器件的最小寫操作包(頁大小)通常會隨著閃存技術(shù)的發(fā)展增加，而性能則會下降。有多種不同的方法可以使最小可讀/寫包大小與物理NAND頁大小脫離關(guān)系，以提高隨機(jī)性能。例如，通過在MLCNAND芯片上植入一種強(qiáng)大的緩存機(jī)制，iNANDe.MMC器件最高可以實現(xiàn)300IOPS寫和2000IOPS讀(4KB)的隨機(jī)性能。這個類似SLC的指定托管區(qū)具有極高的隨機(jī)性能和卓越的耐用性，實際上充當(dāng)著由操作系統(tǒng)和應(yīng)用程序驅(qū)動的重復(fù)性小數(shù)據(jù)操作的“暫存區(qū)”。
? ? 平臺
? ? 隨著移動技術(shù)和應(yīng)用的不斷發(fā)展，原始序列性能尤其是隨機(jī)性能顯得越來越重要，但與此同時還要注意處理器、存儲器件、操作系統(tǒng)、文件系統(tǒng)以及應(yīng)用程序之間的集成性能。過去，閃存式存儲器件一般僅由一種應(yīng)用程序訪問(例如，個人媒體播放器中的音樂文件或相機(jī)中的靜態(tài)圖像等)，因而可以針對這種操作專門進(jìn)行優(yōu)化。然而，在眾多應(yīng)用進(jìn)入當(dāng)今高級智能手機(jī)和平板電腦的情況下，訪問嵌入式存儲器件的應(yīng)用程序不斷增多并且要求也各不相同，甚至有時還相互沖突(比如，高清或3D高清錄像應(yīng)用要求具有恒定的高速序列比特率，而電子郵件應(yīng)用則要求高速的隨機(jī)性能)。
? ? 與此同時，移動操作系統(tǒng)中更先進(jìn)的多任務(wù)功能也呈增長之勢，這意味著這些應(yīng)用程序在某些情況下可能會同時訪問存儲器件。因此，由于存儲器件在一段時間內(nèi)一般只能處理一種操作，僅僅只有高序列性能和隨機(jī)性能還不足以為低延遲和靈敏的多任務(wù)處理提供保障。移動應(yīng)用程序也可能在訪問操作系統(tǒng)、文件系統(tǒng)和e.MMC驅(qū)動器的方式上存在巨大差異。如果未能充分預(yù)見并采取有效措施，器件的使用情況可能會對移動應(yīng)用程序的響應(yīng)過程造成極大影響(例如，在高清錄像應(yīng)用程序?qū)懭氪笮蛄邪鼤r，電子郵件應(yīng)用程序執(zhí)行的小隨機(jī)寫操作就會導(dǎo)致臨時中斷)。如果無法適應(yīng)應(yīng)用程序的操作，還會影響到存儲器件的使用壽命，因為隨著時間的增加，無效率的寫模式會影響存儲器件的耐用性。
? ? 隨著移動應(yīng)用程序的不斷發(fā)展和融合，能否深入了解移動應(yīng)用程序訪問存儲器件的方式，日益成為改進(jìn)存儲器件和提高智能手機(jī)和平板設(shè)備性能的關(guān)鍵。在存儲器件層面，通過深入研究現(xiàn)實移動應(yīng)用程序?qū)Υ鎯ζ骷脑L問模式，有利于優(yōu)化存儲器件的設(shè)計。在移動設(shè)備層面，深入了解應(yīng)用程序?qū)Υ鎯ζ骷挠绊懛绞?，有利于提高主處理器、操作系統(tǒng)和存儲器件之間的集成度(圖3)。同時，還有助于在設(shè)計階段將存儲器件訪問的低效問題隔離開來并進(jìn)行相應(yīng)的補(bǔ)救，從而實現(xiàn)性能優(yōu)化。這在競爭激烈的手機(jī)和平板電腦市場上顯得尤其重要。在多種競爭設(shè)備采用類似的外觀、參數(shù)、屏幕尺寸和操作系統(tǒng)的背景下，許多產(chǎn)品的研究結(jié)果表明，能夠提供杰出的用戶體驗才是關(guān)鍵因素。

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主營DCS系統(tǒng)配件
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CEI JP15-110 Servo Valve / Control Enterprises Inc

Hartmann Controls Inc Rol-Vane HT10 Hydraulic Motor

Siemens Servo Motor 1FT5066-0AC01-0?-Z Used

NEW Joucomatic Proportional Valve 833-355101203 Waranty

Pacific Scientific R33GENC-R2-NS-N?V-00 Servo Motor

New Parker Dyval 10-1100/200/80/?20.0 Proportional Valve

專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊

PLC模塊，可編程控制器，CPU模塊，IO模塊，AI模塊，通訊模塊。AB/施耐德/ABB/GE/本特利/西屋/英維斯/霍尼韋爾/黑馬/FU克斯波羅

15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國內(nèi)實力庫存商家


選擇深圳長欣，選擇放心，售后無憂大量現(xiàn)貨，當(dāng)天順豐發(fā)貨！
主營：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(jī)器人系統(tǒng)配件，大型伺服系統(tǒng)備件。

先介紹幾點經(jīng)驗。
1、先通讀一遍“系統(tǒng)手冊”（不管能不能看懂，先了解個大概，以便學(xué)習(xí)編程時查找）；
2、由位控邏輯入手，逐漸增加定時、計數(shù)等條件，把或、與、非關(guān)系理順；
3、進(jìn)而練習(xí)整數(shù)運算、實數(shù)運算、類型轉(zhuǎn)換；
4、量程轉(zhuǎn)換、PID調(diào)節(jié)回路的建立及P、I、D參數(shù)的理解（最好是有個物理回路驗證，比如變頻器+電機(jī)+測速傳感器）；
5、循環(huán)、順序、跳轉(zhuǎn)等程序控制（盡量避免跳轉(zhuǎn)，非跳不可時也是跳的越近越好）；
6、中斷、通訊、位置控制....

本人以ABB工業(yè)機(jī)器人配件DSQC系列和Motorola MVME系列，GE 卡件 模塊 驅(qū)動器系列為主攻。各位電工朋友可根據(jù)自己的條件選擇適合自己的PLC品牌，由于PLC的基本框架大同小異，學(xué)會一種至于其它的學(xué)習(xí)起來也就簡單了。

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