📄 sd和mmc记忆卡介面技术基带.mht
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href=3D"http://www.52rd.com/Tech">技术文章<=
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> <a href=3D"http://www.52rd.com/Tech/TXTBASE35.htm">手=
6426;研发</a>
> <a href=3D"http://www.52rd.com/Tech/TXT51.htm">基带=
;</a>
> 正文<o:p></o:p></span></span></b></p>
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15.0pt;word-break:break-all'><b><span lang=3DEN-US style=3D'color:b=
lack'>SD和MMC记忆卡介面技术=
<o:p></o:p></span></b></p>
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<p class=3DMsoNormal align=3Dcenter style=3D'text-align:center;line=
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15.0pt;word-break:break-all'><span lang=3DEN-US style=3D'font-size:=
9.0pt;
color:black'><a href=3D"http://www.52rd.com/">http://www.52rd.com/<=
/a>　2006年8月22日　我爱研&=
#21457;网　司马余<o:p></o:p></span></p>
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<p class=3DMsoNormal style=3D'line-height:15.0pt;word-break:bre=
ak-all'><span
style=3D'font-size:9.0pt;color:black'>一般而&=
#35328;，<span
lang=3DEN-US>MCI包含了命令暂=
;存器、回应暂存器、&#=
36164;料暂存器、逾时（timeo=
ut）计数器和<span
class=3DGramE>侦</span>错逻辑，&#=
33021;够自动传送命令，õ=
17;要时，还能接收相关=
的回应和资料。它使=
9992;极少的处理器资源Ӎ=
0;MCI<span
class=3DGramE>支援串流</span>、&#=
21306;块和多区块资料的Ŧ=
35;写，可以透过DMA通道<span
class=3DGramE>做快速</span>的传&#=
36755;，减少对处理器的Ë=
81;赖，和降低对缓冲记=
忆体的需求。
<o:p></o:p></span></span></p>
<p style=3D'line-height:15.0pt;word-break:break-all'><span
style=3D'font-size:9.0pt;color:black'>典型的<=
span
lang=3DEN-US>MCI的工作速率是=
;<span
class=3DGramE>主时脉</span>的一&#=
21322;，可以支援的<span
class=3DGramE>最大时槽</span>（sl=
ot）是16个（视不同厂牌=
;而定），而每一个<span
class=3DGramE>时槽可以</span>用&#=
26469;连接一个MMC匯<span
class=3DGramE>流排（最多共<=
/span>可连接30片MMC记忆卡）=
或每一个<span
class=3DGramE>时槽可以</span>用&#=
26469;连接一片SD记忆卡。=
2312;同一个时间内，只೦=
1;选择<span
class=3DGramE>一个时槽</span>，&#=
22240;为<span
class=3DGramE>时槽是多工</span>&#=
20256;输的。在命令暂存Ý=
20;里有一个位<span
class=3DGramE>元可以</span>用来<s=
pan
class=3DGramE>选择时槽</span>。<o=
:p></o:p></span></span></p>
<p style=3D'line-height:15.0pt;word-break:break-all'><span
lang=3DEN-US style=3D'font-size:9.0pt;color:black'>SD记&#=
24518;卡介面是使用<span
class=3DGramE>9个脚位</span>，这&=
#21253;含：<span
class=3DGramE>时脉</span>、命令&#=
12289;4条资料线、3条电源=
2447;。MMC记忆卡介面是使=
9992;<span
class=3DGramE>7个脚位</span>，这&=
#21253;含：<span
class=3DGramE>时脉</span>、命令&#=
12289;1条资料线、3条电力=
2447;。有趣的是，有些MCI=
0340;SD记忆卡介面也支援MMC&=
#35835;写作业，这就变成SD&#=
35760;忆卡和MMC记忆卡可以&#=
20849;用相同的插槽。SD和MMC=
记忆卡的最主要差别=
2312;于：初始化流程和ࡑ=
5;流排<span
class=3DGramE>佈</span>线架构。<o=
:p></o:p></span></p>
<p style=3D'line-height:15.0pt;word-break:break-all'><span
style=3D'font-size:9.0pt;color:black'>附图一&=
#26159;<span
lang=3DEN-US>MCI的位置图示。=
;附图二是MCI的应用图示=
;。附图一中<span
class=3DGramE>的脚位名称</span>&#=
20043;意义如下：<br>
．MCCDA/MCCDB：MMC或SD记忆卡=
;的命令或回应。<br>
．MCCK：MMC或SD记忆卡<span
class=3DGramE>的时脉</span>。<br>
．MCDA0 ~ MCDA3：MMC的位<span class=3DG=
ramE>元资料</span>（DAT[0]），SD的=
;位<span
class=3DGramE>元资料</span>（DAT[0 ~3]&=
#65289;。MMC只有1条资料线（=
data
line），SD共有4条资料=
线，所以，它们的资=
6009;<span
class=3DGramE>匯流排宽度</span>&#=
65288;data
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