📄 sd卡接口的完整规范（一）.htm
字号:
style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体">◎</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">正向兼容</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">MMC</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">卡</SPAN><FONT
face="Times New Roman">
</FONT><SPAN
style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体">◎</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">高速串行接口带随即存取</SPAN><FONT
face="Times New Roman"> </FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">－－－支持双通道闪存交叉存取</SPAN><FONT
face="Times New Roman"> </FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">－－－快写技术：一个低成本的方案,能够超高速闪存访问和高可靠数据存储</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">－－－最大读写速率：</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">10Mbyte/s </FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体">◎</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">最大</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">10</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">个堆叠的卡（</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">20MHz,Vcc=2.7-3.6V)
</FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体">◎</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">数据寿命：</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">10</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">万次编程</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">/</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">擦除</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体">◎</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">CE</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">和</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">FCC</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">认证</SPAN><FONT
face="Times New Roman">
</FONT><SPAN
style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体">◎</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">PIP</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">封装技术</SPAN><FONT
face="Times New Roman"> </FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体">◎</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">尺寸：</SPAN><st1:chmetcnv
TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="24"
UnitName="mm"><SPAN lang=EN-US><FONT
face="Times New Roman">24mm</FONT></SPAN></st1:chmetcnv><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">宽</SPAN><FONT
face="Times New Roman"><SPAN lang=EN-US>×</SPAN><st1:chmetcnv TCSC="0"
NumberType="1" Negative="False" HasSpace="False" SourceValue="32"
UnitName="mm"><SPAN lang=EN-US>32mm</SPAN></st1:chmetcnv></FONT><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">长</SPAN><FONT
face="Times New Roman"><SPAN lang=EN-US>×</SPAN><st1:chmetcnv TCSC="0"
NumberType="1" Negative="False" HasSpace="False" SourceValue="1.44"
UnitName="mm"><SPAN lang=EN-US>1.44mm</SPAN></st1:chmetcnv></FONT><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">厚</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US><o:p><FONT
face="Times New Roman"> </FONT></o:p></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">说明：</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">本</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">SD</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">卡高度集成闪存,具备串行和随机存取能力。可以通过专用优化速度的串行接口访问,数据传输可靠。接口允许几个卡垛叠,通过他们的外部连接。接口完全符合最新的消费者标准,叫做</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">SD</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">卡系统标准,由</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">SD</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">卡系统规范定义。</SPAN><FONT
face="Times New Roman"> </FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US><FONT
face="Times New Roman">SD</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">卡系统是一个新的大容量存储系统,基于半导体技术的变革。</SPAN><FONT
face="Times New Roman"> </FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">它的出现,提供了一个便宜的、结实的卡片式的存储媒介,为了消费多媒体应用。</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US><FONT
face="Times New Roman">SD</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">卡可以设计出便宜的播放器和驱动器而没有可移动的部分。</SPAN><FONT
face="Times New Roman"> </FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">一个低耗电和广供电电压的可以满足移动电话、电池应用比如音乐播放器、个人管理器、掌上电脑、电子书、电子百科全书、电子词典等等。</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">使用非常有效的数据压缩比如</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">MPEG</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">,</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">SD</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">卡可以提供足够的容量来应付多媒体数据。</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US><o:p><FONT
face="Times New Roman"> <IMG
style="BORDER-LEFT-COLOR: #000000; BORDER-BOTTOM-COLOR: #000000; BORDER-TOP-COLOR: #000000; BORDER-RIGHT-COLOR: #000000"
src="SD卡接口的完整规范（一）.files/20060822125944816.gif" border=0><A
href="http://www.mcu123.com/news/Article/UploadFiles/200608/20060822125946432.gif"
target=_blank></A></FONT></o:p></SPAN><SPAN lang=EN-US><o:p><FONT
face="Times New Roman"> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">框图：</SPAN><FONT
face="Times New Roman"> </FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US><FONT
face="Times New Roman">SD</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">卡上所有单元由内部时钟发生器提供时钟。接口驱动单元同步外部时钟的</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">DAT</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">和</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">CMD</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">信号到内部所用时钟。</SPAN><FONT
face="Times New Roman"> </FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">本卡由</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">6</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">线</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">SD</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">卡接口控制,包括：</SPAN><SPAN
lang=EN-US><FONT
face="Times New Roman">CMD,CLK,DAT0-DAT3</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">。</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">在多</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">SD</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">卡垛叠中为了标识</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">SD</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">卡,一个卡标识寄存器</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">(CID)</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">和一个相应地址寄存器（</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">RCA</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">）预先准备好。</SPAN><FONT
face="Times New Roman"> </FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">一个附加的寄存器包括不同类型操作参数。</SPAN><FONT
face="Times New Roman"> </FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">这个寄存器叫做</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">CSD</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">。</SPAN><FONT
face="Times New Roman"> </FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">使用</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">SD</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">卡线访问存储器还是寄存器的通信由</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">SD</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">卡标准定义。</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">卡有自己的电源开通检测单元。</SPAN><FONT
face="Times New Roman"> </FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">无需附加的主复位信号来在电源开启后安装卡。</SPAN><FONT
face="Times New Roman"> </FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">它防短路,在带电插入或移出卡时。</SPAN><FONT
face="Times New Roman"> </FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: ''Times New Roman''; mso-hansi-font-family: ''Times New Roman''">无需外部编程电压。</SPAN><FONT
face="Times New Roman"> </FONT></P>
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