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📄 sd卡接口的完整规范（二）.htm

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                  <DIV align=center><FONT 
                  size=4><STRONG>SD卡接口的完整规范（二）</STRONG></FONT></DIV><BR><BR>回复从该CMD线上串行传输。一个命令是对之前命令的回答。回复可以来自单机或所有卡。&nbsp; 
                  <BR>DAT0～3：数据可以从卡传向主机或副versa。数据通过数据线传输。 <BR><BR>&nbsp; 
                  <BR><BR>&nbsp; <BR><BR>SD卡总线拓扑 <BR><BR>&nbsp; 
                  <BR><BR>SPI模式针脚定义 <BR><BR>针脚 <BR>&nbsp;名称 <BR>&nbsp;类型 
                  <BR>&nbsp;描述 <BR>&nbsp; <BR>1 <BR>&nbsp;CS <BR>&nbsp;I 
                  <BR>&nbsp;片选（负有效） <BR>&nbsp; <BR>2 <BR>&nbsp;DI <BR>&nbsp;I 
                  <BR>&nbsp;数据输入 <BR>&nbsp; <BR>3 <BR>&nbsp;Vss <BR>&nbsp;S 
                  <BR>&nbsp;地 <BR>&nbsp; <BR>4 <BR>&nbsp;Vcc <BR>&nbsp;S 
                  <BR>&nbsp;供电电压 <BR>&nbsp; <BR>5 <BR>&nbsp;CLK <BR>&nbsp;I 
                  <BR>&nbsp;时钟 <BR>&nbsp; <BR>6 <BR>&nbsp;Vss2 <BR>&nbsp;S 
                  <BR>&nbsp;地 <BR>&nbsp; <BR>7 <BR>&nbsp;DO <BR>&nbsp;O 
                  <BR>&nbsp;数据输出 <BR>&nbsp; <BR>8 <BR>&nbsp;RSV <BR>&nbsp;-- 
                  <BR>&nbsp;&nbsp; <BR>&nbsp; <BR>9 <BR>&nbsp;RSV <BR>&nbsp;-- 
                  <BR>&nbsp;&nbsp; <BR>&nbsp; 
                  <BR><BR>1：S：电源供电,I：输入O：输出&nbsp;I/O：双向&nbsp;PP：I/O使用推挽驱动 
                  <BR><BR>注意：SPI模式时,这些信号需要在主机端用10~100K欧的电阻上拉。 
                  <BR><BR>SPI&nbsp;总线概念 
                  <BR><BR>SPI总线允许通过2通道（数据入和出）传输比特数据。SPI兼容模式使得MMC主机系统通过很小的改动就可以使用ＳＤ卡。SPI模式使用字节传输。 
                  <BR><IMG 
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                  border=0><BR>所有的数据被融合到一些字节中并aligned&nbsp;to&nbsp;the&nbsp;CS&nbsp;signal（可能是：同过CS信号来校正）。SPI模式的优点就是简化主机的设计。特别的,MMC主机需要小的改动。SPI模式相对于SD模式的不足之处是丧失了速度性能。&nbsp;<BR><BR>&nbsp; 
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                  border=0><BR>&nbsp; <BR><BR>SD卡的电特性&nbsp;<BR><BR>&nbsp; 
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                  border=0><BR>&nbsp;&nbsp;<BR><BR>&nbsp;&nbsp;<BR><BR>&nbsp; 
                  <BR><BR>SD卡的连接电路图 <BR><SPAN class=style1>(<A class=link3 
                  href="http://www.avrw.com/" 
                target=_parent>综合电子论坛</A>)</SPAN></TD></TR></TBODY></TABLE>
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            align=center>&nbsp;*注：部份文章为网上收录供大家共同学习参考之用，并不代表本站意见。如存在版权问题请马上通知我们，我们将马上删除。</P></TD></TR></TBODY></TABLE></P></TD></TR></TBODY></TABLE>
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