topic CAN0 FD‘s BRS&ESI&DLC waveform is strange in S32K https://community.nxp.com/t5/S32K/CAN0-FD-s-BRS-ESI-DLC-waveform-is-strange/m-p/916723#M4756 <HTML><HEAD></HEAD><BODY><P>According to&nbsp; CAN FD spec，the BRS+ESI+DLC is 6bit。</P><P>But their waveform is not 6bit。I find the waveform&nbsp; is strange。</P><P>The wave form is as follow。Who can help me？</P><P><span class="lia-inline-image-display-wrapper" image-alt="FD.PNG"><img src="https://community.nxp.com/t5/image/serverpage/image-id/88149i67E073E999AEFDF9/image-size/large?v=v2&amp;px=999" role="button" title="FD.PNG" alt="FD.PNG" /></span></P><P></P><P>For details，please refer to&nbsp;CAN FD _issue.xlsx。</P></BODY></HTML> Thu, 26 Sep 2019 07:41:31 GMT chengsz1206 2019-09-26T07:41:31Z CAN0 FD‘s BRS&ESI&DLC waveform is strange https://community.nxp.com/t5/S32K/CAN0-FD-s-BRS-ESI-DLC-waveform-is-strange/m-p/916723#M4756 <HTML><HEAD></HEAD><BODY><P>According to&nbsp; CAN FD spec，the BRS+ESI+DLC is 6bit。</P><P>But their waveform is not 6bit。I find the waveform&nbsp; is strange。</P><P>The wave form is as follow。Who can help me？</P><P><span class="lia-inline-image-display-wrapper" image-alt="FD.PNG"><img src="https://community.nxp.com/t5/image/serverpage/image-id/88149i67E073E999AEFDF9/image-size/large?v=v2&amp;px=999" role="button" title="FD.PNG" alt="FD.PNG" /></span></P><P></P><P>For details，please refer to&nbsp;CAN FD _issue.xlsx。</P></BODY></HTML> Thu, 26 Sep 2019 07:41:31 GMT https://community.nxp.com/t5/S32K/CAN0-FD-s-BRS-ESI-DLC-waveform-is-strange/m-p/916723#M4756 chengsz1206 2019-09-26T07:41:31Z Re: CAN0 FD‘s BRS&ESI&DLC waveform is strange https://community.nxp.com/t5/S32K/CAN0-FD-s-BRS-ESI-DLC-waveform-is-strange/m-p/916724#M4757 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P></P><P>the waveform is correct.</P><P>The bit meaning of the CANH signal is below</P><P></P><P></P><P><span class="lia-inline-image-display-wrapper" image-alt="CAN fd frame1.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/82996i890481431357287E/image-size/large?v=v2&amp;px=999" role="button" title="CAN fd frame1.png" alt="CAN fd frame1.png" /></span></P><P></P><P>when zooming into bitrate switching...</P><P></P><P><span class="lia-inline-image-display-wrapper" image-alt="CAN fd frame 2.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/83036i3F711B3FDA47A515/image-size/large?v=v2&amp;px=999" role="button" title="CAN fd frame 2.png" alt="CAN fd frame 2.png" /></span></P><P></P><P>At the sample point of BRS bit the bitrate is switched, so BRS bit is little bit shorter then previous bits.</P><P>Within DLC bits a stuff bit of opposite polarity is inserted after five bits of same polarity are detected.&nbsp;&nbsp;</P><P></P><P>BR, Petr</P></BODY></HTML> Fri, 27 Sep 2019 06:29:55 GMT https://community.nxp.com/t5/S32K/CAN0-FD-s-BRS-ESI-DLC-waveform-is-strange/m-p/916724#M4757 PetrS 2019-09-27T06:29:55Z