https://community.nxp.com/t5/i-MX-Processors/about-ddr3-calibration-value-select/m-p/1274940#M173870 <P><a href="https://community.nxp.com/t5/user/viewprofilepage/user-id/63946">@changbaoma</a>&nbsp;<BR />Hello,</P> <P>&nbsp;&nbsp; please refer to the following:</P> <P><A href="https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/i-MX6-DDR-calibration-stress-for-Mass-Production/ta-p/1101155" target="_blank">https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/i-MX6-DDR-calibration-stress-for-Mass-Production/ta-p/1101155</A></P> <P>&nbsp;</P> <P>Regards,<BR />Yuri.</P> Tue, 11 May 2021 09:44:24 GMT Yuri 2021-05-11T09:44:24Z https://community.nxp.com/t5/i-MX-Processors/about-ddr3-calibration-value-select/m-p/1274876#M173853 <P>I got ddr3 calibration value by running&nbsp;<SPAN>The i.MX 6/7 Series DDR stress test tool, eg.</SPAN></P><P><EM>MMDC registers updated from calibration</EM></P><P><EM>Write leveling calibration</EM><BR /><EM>MMDC_MPWLDECTRL0 ch0 (0x021b080c) = 0x00000000</EM><BR /><EM>MMDC_MPWLDECTRL1 ch0 (0x021b0810) = 0x001F001F</EM></P><P><EM>Read DQS Gating calibration</EM><BR /><EM>MPDGCTRL0 PHY0 (0x021b083c) = 0x4154014C</EM><BR /><EM>MPDGCTRL1 PHY0 (0x021b0840) = 0x00000000</EM></P><P><EM>Read calibration</EM><BR /><EM>MPRDDLCTL PHY0 (0x021b0848) = 0x40402E32</EM></P><P><EM>Write calibration</EM><BR /><EM>MPWRDLCTL PHY0 (0x021b0850) = 0x40403830</EM></P><P><BR /><EM>Success: DDR calibration completed!!!</EM></P><P>But some calibration values may&nbsp;vary each run on the same board or run on different boards.</P><P>eg.</P><P>MPDGCTRL0 PHY0 (0x021b083c) = 0x41<FONT color="#FF0000">54</FONT>01<FONT color="#FF0000">4C</FONT></P><P>MPDGCTRL0 PHY0 (0x021b083c) = 0x41<FONT color="#FF0000">50</FONT>01<FONT color="#FF0000">48</FONT></P><P>MPDGCTRL0 PHY0 (0x021b083c) = 0x41<FONT color="#FF0000">4C</FONT>01<FONT color="#FF0000">48</FONT></P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="changbaoma_0-1620721248610.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/144442iD001B297BE6BD0A5/image-size/medium?v=v2&amp;px=400" role="button" title="changbaoma_0-1620721248610.png" alt="changbaoma_0-1620721248610.png" /><span class="lia-inline-image-caption" onclick="event.preventDefault();">changbaoma_0-1620721248610.png</span></span></P><P>How do i choose this calibration value？ the max one? the min one? or&nbsp;average of the 3 values？</P><P>&nbsp;</P><P>&nbsp;</P> Tue, 11 May 2021 08:25:45 GMT https://community.nxp.com/t5/i-MX-Processors/about-ddr3-calibration-value-select/m-p/1274876#M173853 changbaoma 2021-05-11T08:25:45Z https://community.nxp.com/t5/i-MX-Processors/about-ddr3-calibration-value-select/m-p/1274940#M173870 <P><a href="https://community.nxp.com/t5/user/viewprofilepage/user-id/63946">@changbaoma</a>&nbsp;<BR />Hello,</P> <P>&nbsp;&nbsp; please refer to the following:</P> <P><A href="https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/i-MX6-DDR-calibration-stress-for-Mass-Production/ta-p/1101155" target="_blank">https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/i-MX6-DDR-calibration-stress-for-Mass-Production/ta-p/1101155</A></P> <P>&nbsp;</P> <P>Regards,<BR />Yuri.</P> Tue, 11 May 2021 09:44:24 GMT https://community.nxp.com/t5/i-MX-Processors/about-ddr3-calibration-value-select/m-p/1274940#M173870 Yuri 2021-05-11T09:44:24Z