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黑猫带你学eMMC协议第10篇:eMMC读写操作详解(read & write)
2022-07-06 06:03:00 【黑猫学长呀】
本文依据eMMC JEDEC5.1及个人工作经验整理而成,如有错误请留言。
文章为个人辛苦整理,付费内容,禁止私自转载。
文章所在专栏:《黑猫带你学:eMMC协议详解》
1 概述
1.1 什么是读写操作
对于emmc来说,最重要的一个操作,就是读和写了。毕竟emmc是存储芯片,专门用来存取数据,而存储数据就是对emmc进行读写操作。
例如,一张照片存入emmc,这个过程就是host将数据传输到emmc设备中,称为写操作。同理,将该照片从emmc取出来,这个过程是emmc将数据传输到host,称为读操作。
1.2 数据总线
emmc中有8根数据线,数据传输有三种总线可选:
1线(DATA0),4线(DATA0DATA3),8线(DATA0DATA7)
对每条数据线,每个时钟周期可以传输1bit(single data rate)和2bits(dual data rate)数据。
1.3 读写分类
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