https://community.nxp.com/t5/i-MX-Processors/Spread-spectrum-feature-for-LCD-clock/m-p/1300315#M176247 <DIV class="yui3-widget axo-view-item portal axo-view-item-focused"><DIV class="axo-view-item-content"><DIV class="ontime-form item-form-body view-item"><DIV class="item-field-table"><DIV class="input-group"><DIV class="item-field-row row input-group yui3-helper-clearfix"><DIV class="item-field-cell-full col-xs-12 htmlreset"><DIV class="item-field-inner-full-right"><DIV class="field">Hi,<BR /><BR />We performed EMC emission test and found that there is a peak at 204Mhz.</DIV><DIV class="field">We suspect it is due to the LCD CLK.<BR />We would like to check if there is spread spectrum feature for the LCD CLK?<BR />If there is such feature, how can we enable it?</DIV><DIV class="field">&nbsp;</DIV><DIV class="field">Regards,</DIV><DIV class="field">SY</DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV> Wed, 30 Jun 2021 09:32:57 GMT yanissy 2021-06-30T09:32:57Z https://community.nxp.com/t5/i-MX-Processors/Spread-spectrum-feature-for-LCD-clock/m-p/1300315#M176247 <DIV class="yui3-widget axo-view-item portal axo-view-item-focused"><DIV class="axo-view-item-content"><DIV class="ontime-form item-form-body view-item"><DIV class="item-field-table"><DIV class="input-group"><DIV class="item-field-row row input-group yui3-helper-clearfix"><DIV class="item-field-cell-full col-xs-12 htmlreset"><DIV class="item-field-inner-full-right"><DIV class="field">Hi,<BR /><BR />We performed EMC emission test and found that there is a peak at 204Mhz.</DIV><DIV class="field">We suspect it is due to the LCD CLK.<BR />We would like to check if there is spread spectrum feature for the LCD CLK?<BR />If there is such feature, how can we enable it?</DIV><DIV class="field">&nbsp;</DIV><DIV class="field">Regards,</DIV><DIV class="field">SY</DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV> Wed, 30 Jun 2021 09:32:57 GMT https://community.nxp.com/t5/i-MX-Processors/Spread-spectrum-feature-for-LCD-clock/m-p/1300315#M176247 yanissy 2021-06-30T09:32:57Z https://community.nxp.com/t5/i-MX-Processors/Spread-spectrum-feature-for-LCD-clock/m-p/1300353#M176251 <P>Hi Foo</P> <P>&nbsp;</P> <P>what processor used in the case, some examples can be found on</P> <P><A href="https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/User-Guide-of-Spread-Spectrum-Support-for-i-MX-8QuadMax-and-i-MX/ta-p/1115731" target="_blank">https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/User-Guide-of-Spread-Spectrum-Support-for-i-MX-8QuadMax-and-i-MX/ta-p/1115731</A></P> <P><A href="https://community.nxp.com/t5/i-MX-Processors/i-MX-8M-Mini-Spread-Spectrum-Clock-MIPI-D-PHY/td-p/1168380" target="_blank">https://community.nxp.com/t5/i-MX-Processors/i-MX-8M-Mini-Spread-Spectrum-Clock-MIPI-D-PHY/td-p/1168380</A></P> <P>&nbsp;</P> <P>Best regards<BR />igor</P> Wed, 30 Jun 2021 10:49:32 GMT https://community.nxp.com/t5/i-MX-Processors/Spread-spectrum-feature-for-LCD-clock/m-p/1300353#M176251 igorpadykov 2021-06-30T10:49:32Z https://community.nxp.com/t5/i-MX-Processors/Spread-spectrum-feature-for-LCD-clock/m-p/1301074#M176298 <P>Hi&nbsp;<a href="https://community.nxp.com/t5/user/viewprofilepage/user-id/37066">@igorpadykov</a>&nbsp;</P><P>We are using system-on-module&nbsp;VAR-SOM-MX7-5G from Variscite.</P><P>The processor is iMX7D.</P><P>We just got a reply from Variscite yesterday on how to enable the spread spectrum via&nbsp;CCM_ANALOG_PLL_VIDEO_SS and CCM_ANALOG_PLL_VIDEO_DENOM registers.&nbsp;</P><P>We will try first using the information provided.</P><P>Meantime if you have example for iMX7D on this LCD spread spectrum, do share to us.</P><P>Appreciate that.</P><P>Regards,</P><P>SY</P> Thu, 01 Jul 2021 09:44:46 GMT https://community.nxp.com/t5/i-MX-Processors/Spread-spectrum-feature-for-LCD-clock/m-p/1301074#M176298 yanissy 2021-07-01T09:44:46Z