ARM-software
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CMSIS_5
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   <div id="projectname">CMSIS-Driver
   &#160;<span id="projectnumber">Version 2.8.0</span>
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   <div id="projectbrief">Peripheral Interface for Middleware and Application Code</div>
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<div class="header">
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<a href="#define-members">Macros</a>  </div>
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<div class="title">MCI Bus Speed Mode<div class="ingroups"><a class="el" href="group__mci__control__gr.html">MCI Control Codes</a></div></div>  </div>
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<p>Specify the bus speed mode.  
<a href="#details">More...</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="define-members"></a>
Macros</h2></td></tr>
<tr class="memitem:ga601fa8b27ab2e5f6d90c93d54c8f412d"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__mci__bus__speed__ctrls.html#ga601fa8b27ab2e5f6d90c93d54c8f412d">ARM_MCI_BUS_DEFAULT_SPEED</a>&#160;&#160;&#160;(0x00UL)</td></tr>
<tr class="memdesc:ga601fa8b27ab2e5f6d90c93d54c8f412d"><td class="mdescLeft">&#160;</td><td class="mdescRight">SD/MMC: Default Speed mode up to 25/26MHz.  <a href="#ga601fa8b27ab2e5f6d90c93d54c8f412d">More...</a><br/></td></tr>
<tr class="separator:ga601fa8b27ab2e5f6d90c93d54c8f412d"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:gaabda746ac7d6b4497358ff655a8ea6be"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__mci__bus__speed__ctrls.html#gaabda746ac7d6b4497358ff655a8ea6be">ARM_MCI_BUS_HIGH_SPEED</a>&#160;&#160;&#160;(0x01UL)</td></tr>
<tr class="memdesc:gaabda746ac7d6b4497358ff655a8ea6be"><td class="mdescLeft">&#160;</td><td class="mdescRight">SD/MMC: High Speed mode up to 50/52MHz.  <a href="#gaabda746ac7d6b4497358ff655a8ea6be">More...</a><br/></td></tr>
<tr class="separator:gaabda746ac7d6b4497358ff655a8ea6be"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga0473c44a7b65044b3c6a8e7012009a4a"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__mci__bus__speed__ctrls.html#ga0473c44a7b65044b3c6a8e7012009a4a">ARM_MCI_BUS_UHS_SDR12</a>&#160;&#160;&#160;(0x02UL)</td></tr>
<tr class="memdesc:ga0473c44a7b65044b3c6a8e7012009a4a"><td class="mdescLeft">&#160;</td><td class="mdescRight">SD: SDR12 (Single Data Rate) up to 25MHz, 12.5MB/s: UHS-I (Ultra High Speed) 1.8V signaling.  <a href="#ga0473c44a7b65044b3c6a8e7012009a4a">More...</a><br/></td></tr>
<tr class="separator:ga0473c44a7b65044b3c6a8e7012009a4a"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:gae32422631052307b3c4d269b25415907"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__mci__bus__speed__ctrls.html#gae32422631052307b3c4d269b25415907">ARM_MCI_BUS_UHS_SDR25</a>&#160;&#160;&#160;(0x03UL)</td></tr>
<tr class="memdesc:gae32422631052307b3c4d269b25415907"><td class="mdescLeft">&#160;</td><td class="mdescRight">SD: SDR25 (Single Data Rate) up to 50MHz, 25 MB/s: UHS-I (Ultra High Speed) 1.8V signaling.  <a href="#gae32422631052307b3c4d269b25415907">More...</a><br/></td></tr>
<tr class="separator:gae32422631052307b3c4d269b25415907"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga9f326c02391d965918ae619b912b81e7"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__mci__bus__speed__ctrls.html#ga9f326c02391d965918ae619b912b81e7">ARM_MCI_BUS_UHS_SDR50</a>&#160;&#160;&#160;(0x04UL)</td></tr>
<tr class="memdesc:ga9f326c02391d965918ae619b912b81e7"><td class="mdescLeft">&#160;</td><td class="mdescRight">SD: SDR50 (Single Data Rate) up to 100MHz, 50 MB/s: UHS-I (Ultra High Speed) 1.8V signaling.  <a href="#ga9f326c02391d965918ae619b912b81e7">More...</a><br/></td></tr>
<tr class="separator:ga9f326c02391d965918ae619b912b81e7"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:gad2bab563e7bbb4bcf6bdabe6a13dadf4"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__mci__bus__speed__ctrls.html#gad2bab563e7bbb4bcf6bdabe6a13dadf4">ARM_MCI_BUS_UHS_SDR104</a>&#160;&#160;&#160;(0x05UL)</td></tr>
<tr class="memdesc:gad2bab563e7bbb4bcf6bdabe6a13dadf4"><td class="mdescLeft">&#160;</td><td class="mdescRight">SD: SDR104 (Single Data Rate) up to 208MHz, 104 MB/s: UHS-I (Ultra High Speed) 1.8V signaling.  <a href="#gad2bab563e7bbb4bcf6bdabe6a13dadf4">More...</a><br/></td></tr>
<tr class="separator:gad2bab563e7bbb4bcf6bdabe6a13dadf4"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga04da920a5cac99eab9784527057f1b9c"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__mci__bus__speed__ctrls.html#ga04da920a5cac99eab9784527057f1b9c">ARM_MCI_BUS_UHS_DDR50</a>&#160;&#160;&#160;(0x06UL)</td></tr>
<tr class="memdesc:ga04da920a5cac99eab9784527057f1b9c"><td class="mdescLeft">&#160;</td><td class="mdescRight">SD: DDR50 (Dual Data Rate) up to 50MHz, 50 MB/s: UHS-I (Ultra High Speed) 1.8V signaling.  <a href="#ga04da920a5cac99eab9784527057f1b9c">More...</a><br/></td></tr>
<tr class="separator:ga04da920a5cac99eab9784527057f1b9c"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Description</h2>
<p>Specify the bus speed mode. </p>
<p>The function <a class="el" href="group__mci__interface__gr.html#gaec0506a2aa4ae75cf6bc02528f36fe30">ARM_MCI_Control</a> with <em>control</em> = <a class="el" href="group__mci__mode__ctrls.html#ga7f982d2e5aec768307d35a83c65fb3ef">ARM_MCI_BUS_SPEED</a> configures the bus speed of the MCI to the requested bits/s specified with <em>arg</em>.</p>
<p>The function <a class="el" href="group__mci__interface__gr.html#gaec0506a2aa4ae75cf6bc02528f36fe30">ARM_MCI_Control</a> with <em>control</em> = <a class="el" href="group__mci__mode__ctrls.html#gaf7ede525eabc618fbbb9f7a294c8ed96">ARM_MCI_BUS_SPEED_MODE</a> configures the bus speed mode of the MCI as specified with <em>arg</em> listed bellow.</p>
<p>The function <a class="el" href="group__mci__interface__gr.html#ga7e5a78b6e6409189833a0b72a0a3c48a">ARM_MCI_GetCapabilities</a> lists the supported bus speed modes. Initially, all SD cards use a 3.3 volt electrical interface. Some SD cards can switch to 1.8 volt operation. For example, the use of ultra-high-speed (UHS) SD cards requires 1.8 volt operation and a 4-bit bus data width. The data field <em>uhs_signaling</em> of the structure <a class="el" href="group__mci__interface__gr.html#structARM__MCI__CAPABILITIES" title="MCI Driver Capabilities. ">ARM_MCI_CAPABILITIES</a> encodes whether the driver supports 1.8 volt UHS signaling.</p>
<dl class="section see"><dt>See Also</dt><dd><ul>
<li><a class="el" href="group__mci__driver__strength__ctrls.html">MCI Driver Strength</a></li>
</ul>
</dd></dl>
<p>The following codes are defined: </p>
<h2 class="groupheader">Macro Definition Documentation</h2>
<a class="anchor" id="ga601fa8b27ab2e5f6d90c93d54c8f412d"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
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          <td class="memname">#define ARM_MCI_BUS_DEFAULT_SPEED&#160;&#160;&#160;(0x00UL)</td>
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</div><div class="memdoc">

<p>SD/MMC: Default Speed mode up to 25/26MHz. </p>

</div>
</div>
<a class="anchor" id="gaabda746ac7d6b4497358ff655a8ea6be"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
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          <td class="memname">#define ARM_MCI_BUS_HIGH_SPEED&#160;&#160;&#160;(0x01UL)</td>
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      </table>
</div><div class="memdoc">

<p>SD/MMC: High Speed mode up to 50/52MHz. </p>

</div>
</div>
<a class="anchor" id="ga0473c44a7b65044b3c6a8e7012009a4a"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">#define ARM_MCI_BUS_UHS_SDR12&#160;&#160;&#160;(0x02UL)</td>
        </tr>
      </table>
</div><div class="memdoc">

<p>SD: SDR12 (Single Data Rate) up to 25MHz, 12.5MB/s: UHS-I (Ultra High Speed) 1.8V signaling. </p>

</div>
</div>
<a class="anchor" id="gae32422631052307b3c4d269b25415907"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">#define ARM_MCI_BUS_UHS_SDR25&#160;&#160;&#160;(0x03UL)</td>
        </tr>
      </table>
</div><div class="memdoc">

<p>SD: SDR25 (Single Data Rate) up to 50MHz, 25 MB/s: UHS-I (Ultra High Speed) 1.8V signaling. </p>

</div>
</div>
<a class="anchor" id="ga9f326c02391d965918ae619b912b81e7"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">#define ARM_MCI_BUS_UHS_SDR50&#160;&#160;&#160;(0x04UL)</td>
        </tr>
      </table>
</div><div class="memdoc">

<p>SD: SDR50 (Single Data Rate) up to 100MHz, 50 MB/s: UHS-I (Ultra High Speed) 1.8V signaling. </p>

</div>
</div>
<a class="anchor" id="gad2bab563e7bbb4bcf6bdabe6a13dadf4"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
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          <td class="memname">#define ARM_MCI_BUS_UHS_SDR104&#160;&#160;&#160;(0x05UL)</td>
        </tr>
      </table>
</div><div class="memdoc">

<p>SD: SDR104 (Single Data Rate) up to 208MHz, 104 MB/s: UHS-I (Ultra High Speed) 1.8V signaling. </p>

</div>
</div>
<a class="anchor" id="ga04da920a5cac99eab9784527057f1b9c"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">#define ARM_MCI_BUS_UHS_DDR50&#160;&#160;&#160;(0x06UL)</td>
        </tr>
      </table>
</div><div class="memdoc">

<p>SD: DDR50 (Dual Data Rate) up to 50MHz, 50 MB/s: UHS-I (Ultra High Speed) 1.8V signaling. </p>

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