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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic concept/concept topic concept" role="article" aria-labelledby="ariaid-title1"><span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/mac/mac_faq.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">常见问题</h1><div class="date inPage">30 Jan 2024</div><div style="color: gray;"></div><div class="- topic/body concept/conbody body conbody"><section class="- topic/section section" id="mac_common_issues__section_vcp_ncs_21c" data-ofbid="mac_common_issues__section_vcp_ncs_21c"><h2 class="- topic/title title sectiontitle">MAC 无法发现 PHY</h2>
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<p class="- topic/p p" data-ofbid="d103061e27__20250121171537">MAC 无法发现 PHY 一般是 MAC 和 PHY 的通信异常导致，PHY 的驱动一般是次要的，因为通用 PHY 驱动基本上可以驱动大部分</p>
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<ul class="- topic/ul ul" id="mac_common_issues__ul_wcp_ncs_21c" data-ofbid="mac_common_issues__ul_wcp_ncs_21c"><li class="- topic/li li" data-ofbid="d103061e31__20250121171537">
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<p class="- topic/p p" data-ofbid="d103061e33__20250121171537">PHY reset 是否配置正常</p>
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</li><li class="- topic/li li" data-ofbid="d103061e36__20250121171537">
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<p class="- topic/p p" data-ofbid="d103061e38__20250121171537">PHY 的地址是否配置正确，一般会有扫描机制，配置错误只会影响启动速度</p>
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</li><li class="- topic/li li" data-ofbid="d103061e41__20250121171537">
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<p class="- topic/p p" data-ofbid="d103061e43__20250121171537">MAC 和 PHY 的 MDC 时钟是否工作正常</p>
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</li></ul>
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</section><section class="- topic/section section" id="mac_common_issues__section_xcp_ncs_21c" data-ofbid="mac_common_issues__section_xcp_ncs_21c"><h2 class="- topic/title title sectiontitle">网络不通</h2>
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<p class="- topic/p p" data-ofbid="d103061e52__20250121171537">在 MAC 和 PHY 联通后而网络不通，譬如 ping 命令不通的原因很多，列一个检查项：</p>
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<ul class="- topic/ul ul" id="mac_common_issues__ul_ycp_ncs_21c" data-ofbid="mac_common_issues__ul_ycp_ncs_21c"><li class="- topic/li li" data-ofbid="d103061e56__20250121171537">
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<p class="- topic/p p" data-ofbid="d103061e58__20250121171537">MDATA 时钟是否配置正确，外部还是内部，必要时使用示波器检查一下波形和频率</p>
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</li><li class="- topic/li li" data-ofbid="d103061e61__20250121171537">
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<p class="- topic/p p" data-ofbid="d103061e63__20250121171537">时延是否配置正确，一定要和硬件原理图匹配</p>
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</li><li class="- topic/li li" data-ofbid="d103061e66__20250121171537">
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<p class="- topic/p p" data-ofbid="d103061e68__20250121171537">检查各寄存器是否有错误信息上报</p>
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</li><li class="- topic/li li" data-ofbid="d103061e71__20250121171537">
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<p class="- topic/p p" data-ofbid="d103061e73__20250121171537">当前网络环境是否有限制，如防火墙开启等</p>
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</li></ul>
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</section></div></article></main></div>
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<div class=" wh_topic_toc "><div class="wh_topic_label">在本页上</div><ul><li class="section-item"><div class="section-title"><a href="#mac_common_issues__section_vcp_ncs_21c" data-tocid="mac_common_issues__section_vcp_ncs_21c">MAC 无法发现 PHY</a></div></li><li class="section-item"><div class="section-title"><a href="#mac_common_issues__section_xcp_ncs_21c" data-tocid="mac_common_issues__section_xcp_ncs_21c">网络不通</a></div></li></ul></div>
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