https://community.nxp.com/t5/S32K/LPSPI-CLOCK-LOOP-BACKED-Mode-application/m-p/1181329#M8772 <P>Hi Jeorge,</P> <P>As shown below, the master can sample the MISO data using either the SCK ouput signal or the delayed SCK output signal.</P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="danielmartynek_0-1605082223748.png" style="width: 539px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/129654i523D4F92ED8C1F39/image-dimensions/539x458?v=v2" width="539" height="458" role="button" title="danielmartynek_0-1605082223748.png" alt="danielmartynek_0-1605082223748.png" /></span></P> <P>If the sample loopback is used, it improves the min. setup time.</P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="danielmartynek_1-1605082308643.png" style="width: 600px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/129655iDC1C3ACC8BEEB204/image-dimensions/600x63?v=v2" width="600" height="63" role="button" title="danielmartynek_1-1605082308643.png" alt="danielmartynek_1-1605082308643.png" /></span></P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="danielmartynek_3-1605082323657.png" style="width: 608px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/129657iAD233F02E9F7D4C5/image-dimensions/608x123?v=v2" width="608" height="123" role="button" title="danielmartynek_3-1605082323657.png" alt="danielmartynek_3-1605082323657.png" /></span></P> <P>&nbsp;</P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="danielmartynek_4-1605082333524.png" style="width: 614px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/129658i1C3929514C1B7344/image-dimensions/614x324?v=v2" width="614" height="324" role="button" title="danielmartynek_4-1605082333524.png" alt="danielmartynek_4-1605082333524.png" /></span></P> <P>&nbsp;</P> <P>Regards,</P> <P>Daniel</P> <P>&nbsp;</P> <P>&nbsp;</P> <P>&nbsp;</P> Wed, 11 Nov 2020 08:13:11 GMT danielmartynek 2020-11-11T08:13:11Z https://community.nxp.com/t5/S32K/LPSPI-CLOCK-LOOP-BACKED-Mode-application/m-p/1180582#M8752 <P>Hi,</P><P>&nbsp;</P><P>RM of s32k14x for LPSPI module says (Page 1632):</P><P>"Enabling the loopback version of the LPSPI_SCK can improve the setup time of the input data from the slave"</P><P>what means this?</P><P>2. in datasheet, in LPSPI timing, Master LOOP_BACKED MODE :</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Capture.JPG" style="width: 999px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/129495i0FF229538A01CA73/image-size/large?v=v2&amp;px=999" role="button" title="Capture.JPG" alt="Capture.JPG" /></span></P><P>why using loop backed mode will increase SPI operation frequency?</P><P>&nbsp;</P><P>Thanks.</P> Tue, 10 Nov 2020 07:58:24 GMT https://community.nxp.com/t5/S32K/LPSPI-CLOCK-LOOP-BACKED-Mode-application/m-p/1180582#M8752 JeorgeB 2020-11-10T07:58:24Z https://community.nxp.com/t5/S32K/LPSPI-CLOCK-LOOP-BACKED-Mode-application/m-p/1181329#M8772 <P>Hi Jeorge,</P> <P>As shown below, the master can sample the MISO data using either the SCK ouput signal or the delayed SCK output signal.</P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="danielmartynek_0-1605082223748.png" style="width: 539px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/129654i523D4F92ED8C1F39/image-dimensions/539x458?v=v2" width="539" height="458" role="button" title="danielmartynek_0-1605082223748.png" alt="danielmartynek_0-1605082223748.png" /></span></P> <P>If the sample loopback is used, it improves the min. setup time.</P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="danielmartynek_1-1605082308643.png" style="width: 600px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/129655iDC1C3ACC8BEEB204/image-dimensions/600x63?v=v2" width="600" height="63" role="button" title="danielmartynek_1-1605082308643.png" alt="danielmartynek_1-1605082308643.png" /></span></P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="danielmartynek_3-1605082323657.png" style="width: 608px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/129657iAD233F02E9F7D4C5/image-dimensions/608x123?v=v2" width="608" height="123" role="button" title="danielmartynek_3-1605082323657.png" alt="danielmartynek_3-1605082323657.png" /></span></P> <P>&nbsp;</P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="danielmartynek_4-1605082333524.png" style="width: 614px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/129658i1C3929514C1B7344/image-dimensions/614x324?v=v2" width="614" height="324" role="button" title="danielmartynek_4-1605082333524.png" alt="danielmartynek_4-1605082333524.png" /></span></P> <P>&nbsp;</P> <P>Regards,</P> <P>Daniel</P> <P>&nbsp;</P> <P>&nbsp;</P> <P>&nbsp;</P> Wed, 11 Nov 2020 08:13:11 GMT https://community.nxp.com/t5/S32K/LPSPI-CLOCK-LOOP-BACKED-Mode-application/m-p/1181329#M8772 danielmartynek 2020-11-11T08:13:11Z