tobot 发表于 2021-8-7 01:14

【米尔MYS-8MMX】米尔MYS-8MMQ6-8E2D-180-C开箱报告一——直观感受

<div class='showpostmsg'><p style="text-indent:21.0000pt; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">对一块开发板,特别是之前没用过的板子进行评测,首先是看做工,如果布板乱七八糟,飞线到处都是,或者芯片布放有的挤有的松,那是一看就没兴趣了,关于这一点,米尔一直做得不错;其次是看资料,资料全,写得细,就有兴趣专研,在</font>http://down.myir-tech.com/MYS-8MMX/<font face="宋体">上资料不错,分类为文档、镜像、工具、源码等,除了包太大,网站下载速度只有</font></span></span><span style="font-size:10.5000pt"><span style="font-family:宋体">100k<font face="宋体">(到现在还没全部下完)以外,暂时没啥可以诟病的。初略看了一下&ldquo;</font><font face="Calibri">MYS-8MMX </font><font face="宋体">产品手册 </font><font face="Calibri">V1.0</font><font face="宋体">&rdquo;,比我之前拿到的</font><font face="Calibri">word</font><font face="宋体">版本有所改进,少量内容依然有值得争议,例如:</font></span></span></span></span></p>

<p align="center" style="text-align:center"> &nbsp;</p>

<p align="center" style="text-align:center"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">图一、错别字</font></span></span></span></span></p>

<p style="text-align:justify">&nbsp;</p>

<p style="text-indent:21.0000pt; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">与参测网页</font>https://bbs.eeworld.com.cn/elecplay/content/177<font face="宋体">中提示&ldquo;带外壳,商业级&rdquo;的</font><font face="Calibri">MYS-8MMQ6-8E2D-180-C-B</font><font face="宋体">不同,收到的板卡并不包含外壳,包装内共计四样:板卡(左)、电源线(右上)、天线(右中)、手册(右下)。</font></span></span></span></span></p>

<p style="text-align:justify">&nbsp;</p>

<p align="center" style="text-align:center"> &nbsp;</p>

<p align="center" style="text-align:center"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">图二、部件</font></span></span></span></span></p>

<p style="text-indent:21.0000pt; text-align:justify">&nbsp;</p>

<p style="text-indent:21.0000pt; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">板卡的全图就直接引用手册上的了(手册上版本是</font>V1.1<font face="宋体">,实物是</font><font face="Calibri">V1.2</font><font face="宋体">)。</font></span></span></span></span></p>

<p align="center" style="text-align:center"> &nbsp;</p>

<p align="center" style="text-align:center"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">图三、板卡</font></span></span></span></span></p>

<p style="text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">拆开包装后,板上最引人注目的主要芯片包括</font>cpu<font face="宋体">和内存(</font><font face="Calibri">U1</font><font face="宋体">、</font><font face="Calibri">U2</font><font face="宋体">、</font><font face="Calibri">U3</font><font face="宋体">):</font></span></span></span></span></p>

<p align="center" style="text-align:center"> &nbsp;</p>

<p align="center" style="text-align:center"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">图四、主芯片和启动拨码</font></span></span></span></span></p>

<p style="text-align:justify">&nbsp;</p>

<p style="text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">主</font>SoC<font face="宋体">(</font><font face="Calibri">U1</font><font face="宋体">)</font></span></span><span style="font-size:9.0000pt"><span style="font-family:微软雅黑"><span style="color:#000000"><span style="font-weight:normal">MIMX8MM6DVTLZAA</span></span></span></span></span></span></p>

<p align="center" style="text-align:center"> &nbsp;</p>

<p align="center" style="text-align:center"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">表一、</font></span></span><span style="font-size:10.5000pt"><span style="font-family:宋体">CPU<font face="宋体">特性</font></span></span><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">参数</font></span></span></span></span></p>

<p style="text-align:justify">&nbsp;</p>

<p style="text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">编号规则</font></span></span></span></span></p>

<p style="text-align:justify"> &nbsp;</p>

<p align="center" style="text-align:center"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">表二、</font></span></span><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">命名规则</font></span></span></span></span></p>

<p style="text-align:justify">&nbsp;</p>

<p style="text-indent:21.0000pt; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">从型号看,是其系列中最高端的一款。</font></span></span></span></span></p>

<p align="center" style="text-align:center"> &nbsp;</p>

<p align="center" style="text-align:center"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">图五、</font>CPU<font face="宋体">架构</font></span></span></span></span></p>

<p style="text-indent:21.0000pt; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">两块</font>DDR4<font face="宋体">(</font><font face="Calibri">U2</font><font face="宋体">、</font><font face="Calibri">U3</font><font face="宋体">),美光的芯片,编号</font><font face="Calibri">9TE75 D9WFJ</font><font face="宋体">,可以在其网站(</font><font face="Calibri">https://www.micron.com/support/tools-and-utilities/fbga</font><font face="宋体">)上查询</font></span></span></span></span></p>

<p align="center" style="text-align:center"> &nbsp;</p>

<p align="center" style="text-align:center"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">表三、美光</font>DDR4</span></span></span></span></p>

<p style="text-indent:21.0000pt; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">根据美光的编号规则:</font>MT<font face="宋体">表示</font><font face="Calibri">Micron Technology</font><font face="宋体">,</font><font face="Calibri">40</font><font face="宋体">表示</font><font face="Calibri">DDR4 SDRAM</font><font face="宋体">,</font><font face="Calibri">A</font><font face="宋体">表示</font><font face="Calibri">1.2V</font><font face="宋体">,</font><font face="Calibri">512M16</font><font face="宋体">表示</font><font face="Calibri">512M</font><font face="宋体">地址深度&times;</font><font face="Calibri">16</font><font face="宋体">位数据宽度</font><font face="Calibri">=1G</font><font face="宋体">容量,</font><font face="Calibri">LY</font><font face="宋体">含义没有查到,</font><font face="Calibri">062</font><font face="宋体">表示最大时钟频率</font><font face="Calibri">1600MHz</font><font face="宋体">。</font></span></span></span></span></p>

<p style="text-align:justify">&nbsp;</p>

<p style="text-align:justify">&nbsp;</p>

<p style="text-indent:21.0000pt; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体">eMMc<font face="宋体">采用的是</font><font face="Calibri">SanDisk SDINBDG4-8G</font><font face="宋体">,和手册中为 </font><font face="Calibri">MTFC8GAKAJCN-4M IT</font><font face="宋体">有区别。</font><font face="Calibri">SCH</font><font face="宋体">文档对其编号是</font><font face="Calibri">U48</font><font face="宋体">,型号与实际相同,但板上丝印层没看到</font><font face="Calibri">U48</font><font face="宋体">的标识字样。其特性参数如下表:</font></span></span></span></span></p>

<p align="center" style="text-align:center"> &nbsp;</p>

<p align="center" style="text-align:center"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">表四、</font></span></span><span style="font-size:10.5000pt"><span style="font-family:宋体">eMMC<font face="宋体">参数</font></span></span></span></span></p>

<p style="text-align:justify">&nbsp;</p>

<p style="text-align:justify">&nbsp;</p>

<p style="text-indent:21.0000pt; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">电源管理</font>IC<font face="宋体">(</font><font face="Calibri">U8</font><font face="宋体">)是</font><font face="Calibri">ROHM BD71847A</font><font face="宋体">,该</font><font face="Calibri">PMIC</font><font face="宋体">是专为</font><font face="Calibri">i.MX 8M mini</font><font face="宋体">应用处理器的解决方案,集成了处理器、</font><font face="Calibri">DDR</font><font face="宋体">存储器和常见系统</font><font face="Calibri">I/O</font><font face="宋体">所需的所有电源,还配备了一个可支持各种应用场景的可编程电源控制时序器。</font></span></span></span></span></p>

<p align="center" style="text-align:center"> &nbsp;</p>

<p align="center" style="text-align:center"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">图六、电源管理芯片</font></span></span></span></span></p>

<p style="text-align:justify">&nbsp;</p>

<p style="text-align:justify">&nbsp;</p>

<p style="text-indent:21.0000pt; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体">U17 AP6256<font face="宋体">支持</font><font face="Calibri">Wi-Fi</font><font face="宋体">(</font><font face="Calibri">2.4GHz</font><font face="宋体">和</font><font face="Calibri">5GHz IEEE 802.11 a/b/g/n/ac</font><font face="宋体">)</font><font face="Calibri">+</font><font face="宋体">蓝牙(</font><font face="Calibri">BT5.0</font><font face="宋体">)功能,为</font><font face="Calibri">Wi-Fi</font><font face="宋体">提供</font><font face="Calibri">SDIO</font><font face="宋体">接口,为蓝牙提供</font><font face="Calibri">UART/PCM</font><font face="宋体">接口。手册中给出了其参考性能:</font></span></span></span></span></p>

<p align="center" style="text-align:center"> &nbsp;</p>

<p align="center" style="text-align:center"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">表五、</font></span></span><span style="font-size:10.5000pt"><span style="font-family:宋体">WiFi<font face="宋体">性能参数</font></span></span></span></span></p>

<p style="text-indent:21.0000pt; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">待验证。</font></span></span></span></span></p>

<p style="text-align:justify">&nbsp;</p>

<p style="text-indent:21.0000pt; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体">U22<font face="宋体">为</font><font face="Calibri">Lontium LT8912 MIPI&reg;DSI</font><font face="宋体">至</font><font face="Calibri">LVDS</font><font face="宋体">和</font><font face="Calibri">HDMI/MHL</font><font face="宋体">网桥,在本论坛(</font><font face="Calibri">https://bbs.eeworld.com.cn/thread-1060899-1-1.html</font><font face="宋体">)上已经有介绍。这里不多展开,后续实验准备对其</font><font face="Calibri">LVDS</font><font face="宋体">和</font><font face="Calibri">HDMI</font><font face="宋体">输出分别进行验证。</font></span></span></span></span></p>

<p style="text-align:justify">&nbsp;</p>

<p style="text-indent:21.0000pt; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">在手册中还特别提到</font>SPI<font face="宋体">存储器</font><font face="Calibri">MT25QU256ABA1EW9-0SIT</font><font face="宋体">(</font><font face="Calibri">U41</font><font face="宋体">),不过在板上没有找到具体位置:</font></span></span></span></span></p>

<p align="center" style="text-align:center"> &nbsp;</p>

<p align="center" style="text-align:center"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">图七、没在板卡上找到的</font></span></span><span style="font-size:10.5000pt"><span style="font-family:宋体">QSPI Flash</span></span></span></span></p>

<p style="text-align:justify">&nbsp;</p>

<p style="text-align:justify">&nbsp;</p>

<p style="text-indent:21.0000pt; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">另外,还有些片子的型号和手册有不同,例如</font>U29<font face="宋体">,板卡上的型号是</font><font face="Calibri">S28HSPY241AL</font><font face="宋体">,</font><font face="Calibri">SCH</font><font face="宋体">文件中的型号是</font><font face="Calibri">9FGV0241AKLF</font><font face="宋体">。</font></span></span></span></span></p>

<p style="text-indent:21.0000pt; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">这个板卡未提供</font>+5VDC<font face="宋体">电源适配器,而是通过一个</font><font face="Calibri">DC</font><font face="宋体">座转</font><font face="Calibri">PHOENIX</font><font face="宋体">端子头连接到板上,需要另配适配器和转接头。要求是使用</font><font face="Calibri">5V</font><font face="宋体">适配器,根据说明书上给出功率要求:</font></span></span></span></span></p>

<p align="center" style="text-align:center"> &nbsp;</p>

<p align="center" style="text-align:center"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">表六、电源功耗</font></span></span></span></span></p>

<p style="text-indent:21.0000pt; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">从这个表中看,</font>2A<font face="宋体">适配器足矣,观察所配线缆,感觉采用音叉</font><font face="Calibri">DC</font><font face="宋体">公头或直插</font><font face="Calibri">DC</font><font face="宋体">公头的适配器均可。</font></span></span></span></span></p>

<p style="text-indent:21.0000pt; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri"><span style="font-size:10.5000pt"><span style="font-family:宋体"><font face="宋体">关于供电这块,快速使用指南是要求用</font>3A<font face="宋体">电源,但手册上是写为:&ldquo;建议使用 </font><font face="Calibri">5V 2A </font><font face="宋体">直流电适配器作为电源输入,如果外围接口接很多负载请用 </font><font face="Calibri">5V</font><font face="宋体">,</font><font face="Calibri">3A </font><font face="宋体">直流适配器</font></span></span><span style="font-size:10.5000pt"><span style="font-family:宋体">&rdquo;从其原理图来看,供电大户是<font face="Calibri">USB</font><font face="宋体">,但其</font><font face="Calibri">usb hub</font><font face="宋体">芯片</font><font face="Calibri">USB2514</font><font face="宋体">仅能支持</font><font face="Calibri">usb 2.0</font><font face="宋体">,意味着最大功率</font><font face="Calibri">2.5w/</font><font face="宋体">接口,这里的</font><font face="Calibri">type-C</font><font face="宋体">也仅仅是一个</font><font face="Calibri">usb</font><font face="宋体">口,而不是真正的</font><font face="Calibri">usb3.1</font><font face="宋体">,因此只算其最大功率</font><font face="Calibri">4.5w</font><font face="宋体">(假设支持</font><font face="Calibri">usb3.0</font><font face="宋体">),这么算下来,</font><font face="Calibri">3A</font><font face="宋体">电源也未必够用。</font></span></span></span></span></p>
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tobot 发表于 2021-8-7 01:21

<p>一些参考文档</p>

<p><br />
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&nbsp;</p>

tobot 发表于 2021-8-10 22:28

<p>我这里有点弄错了,只支持usb2.0</p>

<p>root@mys-8mmx:~# lsusb<br />
Bus 001 Device 002: ID 0424:2514 Standard Microsystems Corp. USB 2.0 Hub<br />
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub</p>

jobszheng5 发表于 2021-10-12 15:46

<p>写得细致</p>

<p>初步了解,读帖子就够了,不用再自己看datasheet了</p>
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