https://community.nxp.com/t5/i-MX-Processors/LPDDR4-Impedance-Configuration/m-p/1780466#M217934 <P>可以的，如果你的DDR测试有问题的话，我们可以帮忙reviewMX8M_Plus_LPDDR4_RPA,这里建议你用最新的版本<A href="https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/i-MX-8MPlus-m865S-DDR-Register-Programming-Aids-RPA/ta-p/1235352" target="_blank">https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/i-MX-8MPlus-m865S-DDR-Register-Programming-Aids-RPA/ta-p/1235352</A></P> <DIV class="lia-attachment-row-element lia-attachment-link-row-element"><A id="link_7" class="lia-link-navigation attachment-link" href="https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/i-MX-8MPlus-m865S-DDR-Register-Programming-Aids-RPA/ta-p/1235352?attachment-id=146791" target="_blank">MX8M_Plus_LPDDR4_RPA_v9.xlsx</A></DIV> <DIV class="lia-attachment-row-element lia-attachment-link-row-element">&nbsp;</DIV> <DIV class="lia-attachment-row-element lia-attachment-link-row-element">&nbsp;</DIV> <DIV class="lia-attachment-row-element lia-attachment-link-row-element">&nbsp;</DIV> <DIV class="lia-attachment-row-element lia-attachment-link-row-element">&nbsp;</DIV> <DIV class="lia-attachment-row-element lia-attachment-link-row-element">&nbsp;</DIV> <DIV class="lia-attachment-row-element lia-attachment-link-row-element">&nbsp;</DIV> Wed, 27 Dec 2023 08:57:22 GMT Rita_Wang 2023-12-27T08:57:22Z https://community.nxp.com/t5/i-MX-Processors/LPDDR4-Impedance-Configuration/m-p/1779923#M217852 <P>Hello：</P><P>&nbsp;</P><P>imx8mp基板经过仿真后，需要配置驱动阻抗60Ω，ODT为40Ω</P><P>用工具‘MX8M_Plus_LPDDR4_RPA_v8’进行配置</P><P>请求帮忙确认，配置方法是否正确，配置内容如下：</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="242.jpg" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/255866iDC4BDE48440C3E15/image-size/medium?v=v2&amp;px=400" role="button" title="242.jpg" alt="242.jpg" /></span></P><P> </P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="250.jpg" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/255867i6A8321A5EEBC3AE7/image-size/medium?v=v2&amp;px=400" role="button" title="250.jpg" alt="250.jpg" /></span></P><P> </P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="468.jpg" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/255868iA6FF6F1C2084A9AD/image-size/medium?v=v2&amp;px=400" role="button" title="468.jpg" alt="468.jpg" /></span></P><P> </P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="476.jpg" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/255869iBDBA4522BB2C416D/image-size/medium?v=v2&amp;px=400" role="button" title="476.jpg" alt="476.jpg" /></span></P><P> </P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="599.jpg" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/255870i8636AEE3AED63D6D/image-size/medium?v=v2&amp;px=400" role="button" title="599.jpg" alt="599.jpg" /></span></P><P> </P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="607.jpg" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/255871iD4DB0316E03637B1/image-size/medium?v=v2&amp;px=400" role="button" title="607.jpg" alt="607.jpg" /></span></P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="638.jpg" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/255874iB2AA9B67A699E20B/image-size/medium?v=v2&amp;px=400" role="button" title="638.jpg" alt="638.jpg" /></span></P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="644.jpg" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/255873i85F2C2B52D5F0E77/image-size/medium?v=v2&amp;px=400" role="button" title="644.jpg" alt="644.jpg" /></span></P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="651.jpg" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/255872i43E582ACC4295213/image-size/medium?v=v2&amp;px=400" role="button" title="651.jpg" alt="651.jpg" /></span></P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="657.jpg" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/255877i2E85180C9DB6D2A2/image-size/medium?v=v2&amp;px=400" role="button" title="657.jpg" alt="657.jpg" /></span></P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="664.jpg" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/255875i131DC14F546F4B73/image-size/medium?v=v2&amp;px=400" role="button" title="664.jpg" alt="664.jpg" /></span></P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="670.jpg" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/255876iA2A4828BD8D2B8F1/image-size/medium?v=v2&amp;px=400" role="button" title="670.jpg" alt="670.jpg" /></span></P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="673.jpg" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/255878iC7279574CCDABBD4/image-size/medium?v=v2&amp;px=400" role="button" title="673.jpg" alt="673.jpg" /></span></P><P>十分感谢！   </P> Tue, 26 Dec 2023 07:35:35 GMT https://community.nxp.com/t5/i-MX-Processors/LPDDR4-Impedance-Configuration/m-p/1779923#M217852 FanS2023 2023-12-26T07:35:35Z https://community.nxp.com/t5/i-MX-Processors/LPDDR4-Impedance-Configuration/m-p/1780466#M217934 <P>可以的，如果你的DDR测试有问题的话，我们可以帮忙reviewMX8M_Plus_LPDDR4_RPA,这里建议你用最新的版本<A href="https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/i-MX-8MPlus-m865S-DDR-Register-Programming-Aids-RPA/ta-p/1235352" target="_blank">https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/i-MX-8MPlus-m865S-DDR-Register-Programming-Aids-RPA/ta-p/1235352</A></P> <DIV class="lia-attachment-row-element lia-attachment-link-row-element"><A id="link_7" class="lia-link-navigation attachment-link" href="https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/i-MX-8MPlus-m865S-DDR-Register-Programming-Aids-RPA/ta-p/1235352?attachment-id=146791" target="_blank">MX8M_Plus_LPDDR4_RPA_v9.xlsx</A></DIV> <DIV class="lia-attachment-row-element lia-attachment-link-row-element">&nbsp;</DIV> <DIV class="lia-attachment-row-element lia-attachment-link-row-element">&nbsp;</DIV> <DIV class="lia-attachment-row-element lia-attachment-link-row-element">&nbsp;</DIV> <DIV class="lia-attachment-row-element lia-attachment-link-row-element">&nbsp;</DIV> <DIV class="lia-attachment-row-element lia-attachment-link-row-element">&nbsp;</DIV> <DIV class="lia-attachment-row-element lia-attachment-link-row-element">&nbsp;</DIV> Wed, 27 Dec 2023 08:57:22 GMT https://community.nxp.com/t5/i-MX-Processors/LPDDR4-Impedance-Configuration/m-p/1780466#M217934 Rita_Wang 2023-12-27T08:57:22Z https://community.nxp.com/t5/i-MX-Processors/LPDDR4-Impedance-Configuration/m-p/1780645#M217955 <P>好的，谢谢你！</P><P>已经测试，没有问题</P> Wed, 27 Dec 2023 23:55:28 GMT https://community.nxp.com/t5/i-MX-Processors/LPDDR4-Impedance-Configuration/m-p/1780645#M217955 FanS2023 2023-12-27T23:55:28Z https://community.nxp.com/t5/i-MX-Processors/LPDDR4-Impedance-Configuration/m-p/1780729#M217968 <P>再请教下</P><P>&nbsp;</P><P>软件仿真最优时Driver 60ohm、ODT40ohm，</P><P>基板设计的线路单端阻抗时50±10%（45-55）ohm，</P><P>这样是否对传输信号的质量有影响？</P><P>&nbsp;</P><P>以上</P> Thu, 28 Dec 2023 04:03:05 GMT https://community.nxp.com/t5/i-MX-Processors/LPDDR4-Impedance-Configuration/m-p/1780729#M217968 FanS2023 2023-12-28T04:03:05Z https://community.nxp.com/t5/i-MX-Processors/LPDDR4-Impedance-Configuration/m-p/1781022#M218007 <P><SPAN><SPAN class="ui-provider a b c d e f g h i j k l m n o p q r s t u v w x y z ab ac ae af ag ah ai aj ak">所有单端信号为50欧姆阻抗，误差+/-10%，无论是怎么模拟，都是这个规则</SPAN></SPAN>。</P> <P>PCB制板过程中，影响到阻抗的因素很多，1. 板材材料偏差，2 PCB蚀刻时的偏差，加工过程中产生的偏差，3， 高速PCB时，甚至连铜箔的光洁度都对阻抗有影响。</P> <P>40欧姆，60欧姆，。。。看上去似乎很精确，但是模拟过程中，没有实际制板过程的因素。</P> <P><LI-WRAPPER></LI-WRAPPER></P> Fri, 29 Dec 2023 02:52:28 GMT https://community.nxp.com/t5/i-MX-Processors/LPDDR4-Impedance-Configuration/m-p/1781022#M218007 Rita_Wang 2023-12-29T02:52:28Z