<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/> <meta http-equiv="X-UA-Compatible" content="IE=9"/> <title>MCI Bus Speed Mode</title> <title>CMSIS-Driver: MCI Bus Speed Mode</title> <link href="tabs.css" rel="stylesheet" type="text/css"/> <link href="cmsis.css" rel="stylesheet" type="text/css" /> <script type="text/javascript" src="jquery.js"></script> <script type="text/javascript" src="dynsections.js"></script> <script type="text/javascript" src="printComponentTabs.js"></script> <link href="navtree.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="resize.js"></script> <script type="text/javascript" src="navtree.js"></script> <script type="text/javascript"> $(document).ready(initResizable); $(window).load(resizeHeight); </script> <link href="search/search.css" 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href="group__mci__bus__speed__ctrls.html#ga601fa8b27ab2e5f6d90c93d54c8f412d">ARM_MCI_BUS_DEFAULT_SPEED</a>   (0x00)</td></tr> <tr class="memdesc:ga601fa8b27ab2e5f6d90c93d54c8f412d"><td class="mdescLeft"> </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"> </td></tr> <tr class="memitem:gaabda746ac7d6b4497358ff655a8ea6be"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__mci__bus__speed__ctrls.html#gaabda746ac7d6b4497358ff655a8ea6be">ARM_MCI_BUS_HIGH_SPEED</a>   (0x01)</td></tr> <tr class="memdesc:gaabda746ac7d6b4497358ff655a8ea6be"><td class="mdescLeft"> </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"> </td></tr> <tr class="memitem:ga0473c44a7b65044b3c6a8e7012009a4a"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__mci__bus__speed__ctrls.html#ga0473c44a7b65044b3c6a8e7012009a4a">ARM_MCI_BUS_UHS_SDR12</a>   (0x02)</td></tr> <tr class="memdesc:ga0473c44a7b65044b3c6a8e7012009a4a"><td class="mdescLeft"> </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"> </td></tr> <tr class="memitem:gae32422631052307b3c4d269b25415907"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__mci__bus__speed__ctrls.html#gae32422631052307b3c4d269b25415907">ARM_MCI_BUS_UHS_SDR25</a>   (0x03)</td></tr> <tr class="memdesc:gae32422631052307b3c4d269b25415907"><td class="mdescLeft"> </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"> </td></tr> <tr class="memitem:ga9f326c02391d965918ae619b912b81e7"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__mci__bus__speed__ctrls.html#ga9f326c02391d965918ae619b912b81e7">ARM_MCI_BUS_UHS_SDR50</a>   (0x04)</td></tr> <tr class="memdesc:ga9f326c02391d965918ae619b912b81e7"><td class="mdescLeft"> </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"> </td></tr> <tr class="memitem:gad2bab563e7bbb4bcf6bdabe6a13dadf4"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__mci__bus__speed__ctrls.html#gad2bab563e7bbb4bcf6bdabe6a13dadf4">ARM_MCI_BUS_UHS_SDR104</a>   (0x05)</td></tr> <tr class="memdesc:gad2bab563e7bbb4bcf6bdabe6a13dadf4"><td class="mdescLeft"> </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"> </td></tr> <tr class="memitem:ga04da920a5cac99eab9784527057f1b9c"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__mci__bus__speed__ctrls.html#ga04da920a5cac99eab9784527057f1b9c">ARM_MCI_BUS_UHS_DDR50</a>   (0x06)</td></tr> <tr class="memdesc:ga04da920a5cac99eab9784527057f1b9c"><td class="mdescLeft"> </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"> </td></tr> </table> <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"> <tr> <td class="memname">#define ARM_MCI_BUS_DEFAULT_SPEED   (0x00)</td> </tr> </table> </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"> <tr> <td class="memname">#define ARM_MCI_BUS_HIGH_SPEED   (0x01)</td> </tr> </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   (0x02)</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   (0x03)</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   (0x04)</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"> <tr> <td class="memname">#define ARM_MCI_BUS_UHS_SDR104   (0x05)</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   (0x06)</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> </div> </div> </div><!-- contents --> </div><!-- doc-content --> <!-- start footer part --> <div id="nav-path" class="navpath"><!-- id is needed for treeview function! --> <ul> <li class="footer">Generated on Wed Feb 8 2017 10:20:44 for CMSIS-Driver by ARM Ltd. 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