6DD1688-0AE0

6DD1688-0AE0

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6DD1688-0AE0

新型恩智浦ARM Cortex-M3微控制器*采用的SPI閃存接口技術(shù)(SPIFI，已申請)可以幫助32位嵌入式系統(tǒng)設(shè)計(jì)人員以小尺寸、低成本的串行閃存替代大尺寸、高成本的并行閃存。利用SPIFI (讀音與spiffy諧音，意為“出色、整潔、漂亮”等——譯注)，外部串行閃存可以映射到微控制器內(nèi)存中，達(dá)到片上內(nèi)存讀取效果。新技術(shù)可以解決傳統(tǒng)嵌入式系統(tǒng)外部閃存選型難題，為設(shè)計(jì)人員在保持系統(tǒng)性能的同時(shí)縮小尺寸及降低成本提供了一條新途徑。

　　目前恩智浦開發(fā)出一種新型外設(shè)接口技術(shù)，該技術(shù)在基于ARM Cortex-M3內(nèi)核的LPC1800微控制器上已得到成功應(yīng)用。嵌入式系統(tǒng)設(shè)計(jì)人員利用該技術(shù)可將串行閃存取代并行閃存，縮小封裝尺寸，降低系統(tǒng)成本。這種稱為SPI閃存接口(SPIFI)的技術(shù)目前已申請，通過該技術(shù)可將外部串行閃存映射到微控制器內(nèi)存，實(shí)現(xiàn)片上內(nèi)存讀取效果。SPIFI為設(shè)計(jì)人員提供了一種創(chuàng)新解決方案，在保持系統(tǒng)性能的同時(shí)達(dá)到簡化配置、縮小封裝體積、減少板載空間占用和節(jié)約系統(tǒng)成本的目的。

　　外部閃存的作用

　　采用32位微控制器(MCU)的嵌入式應(yīng)用目前越來越復(fù)雜，需要完成多媒體、照片和其他各種數(shù)據(jù)密集型內(nèi)容的管理任務(wù)。特別是人機(jī)接口系統(tǒng)，用戶現(xiàn)在都希望有圖形顯示，通過窗口、圖片、動(dòng)畫、聲音和其他多媒體方式實(shí)現(xiàn)人機(jī)對話。此外，隨著市場的化，產(chǎn)品需要滿足多國語言要求，支持各種字母和字符。所有這些都對系統(tǒng)存儲(chǔ)資源提出了更高要求。

　　大部分32位微控制器都配有片上閃存，用于支持各種數(shù)據(jù)密集型功能，但是這種內(nèi)存容量有限，通常無法滿足整體應(yīng)用要求。片上閃存通常不足1Mb，雖然能夠解決主要應(yīng)用代碼存儲(chǔ)，卻無法滿足其他應(yīng)用資料的保存要求，比如：查找表單、圖像、照片、聲音文件、多國語言等。為此，設(shè)計(jì)人員通常要使用外部閃存。

　　與片上閃存相比，外部閃存成本要低很多，而且通常都有8Mb以上的現(xiàn)貨。使用外部閃存可以增加系統(tǒng)靈活性，系統(tǒng)運(yùn)行時(shí)能夠更新升級(jí)軟件。

　　并行閃存與串行閃存的艱難選擇

　　對于外部閃存選型(串行和并行)，設(shè)計(jì)人員通常要綜合評(píng)估，折衷考慮。并行閃存的速度通常比串行閃存快，但需要使用更多管腳、PCB布線和板載空間。

　　圖1給出了串行和并行閃存典型的數(shù)據(jù)傳輸速率。對于并行閃存，圖中假定無緩沖，固定存取時(shí)間為90ns。基于上述條件，16位并行閃存的zui大傳輸速率22Mb/s。對于串行閃存，zui大時(shí)鐘頻率80MHz的每位傳輸速率為80Mb/s，四通道串行閃存zui大傳輸速率為40Mb/s。雖然該計(jì)算忽略了控制位，但四通道SPI閃存支持burst位，而SPIFI接口支持該功能，因此SPIFI接口可以達(dá)到上述傳輸速率。

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