https://community.nxp.com/t5/Other-NXP-Products/Buffer-size-for-SPI-communication-using-MC20XS4200-in-daisy/m-p/1298640#M11390 <P>Dear NXP hello,</P><P>I am using the MC20XS4200 to control 6 outputs motor and bulb loads. The PCB board contains 3 MC20XS4200, each MC20XS4200 has 2 channels.</P><P>The MC20XS4200 are connected in daisy chain configuration, each MC20XS4200 has 13 register out and 13 register in. Each MC20XS4200 is controlled by its /CSB.</P><P>Since the MC20XS4200 are connected in daisy chain configuration, I have to send one buffer each 10ms task for all the MC20XS4200s to write, read and toggle WD to avoid reset.</P><P>My question is:</P><P>How I could calculate the buffer cache size?<span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Capture d’écran 2021-06-26 105818.png" style="width: 999px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/148077i6D8343F5591AFEA4/image-size/large?v=v2&amp;px=999" role="button" title="Capture d’écran 2021-06-26 105818.png" alt="Capture d’écran 2021-06-26 105818.png" /></span><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Capture d’écran 2021-06-26 105835.png" style="width: 999px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/148078i92E73F7D172EE355/image-size/large?v=v2&amp;px=999" role="button" title="Capture d’écran 2021-06-26 105835.png" alt="Capture d’écran 2021-06-26 105835.png" /></span></P><P>Thank you in advance,</P><P>S.Tarik</P> Sat, 26 Jun 2021 09:03:57 GMT InHome 2021-06-26T09:03:57Z https://community.nxp.com/t5/Other-NXP-Products/Buffer-size-for-SPI-communication-using-MC20XS4200-in-daisy/m-p/1298640#M11390 <P>Dear NXP hello,</P><P>I am using the MC20XS4200 to control 6 outputs motor and bulb loads. The PCB board contains 3 MC20XS4200, each MC20XS4200 has 2 channels.</P><P>The MC20XS4200 are connected in daisy chain configuration, each MC20XS4200 has 13 register out and 13 register in. Each MC20XS4200 is controlled by its /CSB.</P><P>Since the MC20XS4200 are connected in daisy chain configuration, I have to send one buffer each 10ms task for all the MC20XS4200s to write, read and toggle WD to avoid reset.</P><P>My question is:</P><P>How I could calculate the buffer cache size?<span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Capture d’écran 2021-06-26 105818.png" style="width: 999px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/148077i6D8343F5591AFEA4/image-size/large?v=v2&amp;px=999" role="button" title="Capture d’écran 2021-06-26 105818.png" alt="Capture d’écran 2021-06-26 105818.png" /></span><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Capture d’écran 2021-06-26 105835.png" style="width: 999px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/148078i92E73F7D172EE355/image-size/large?v=v2&amp;px=999" role="button" title="Capture d’écran 2021-06-26 105835.png" alt="Capture d’écran 2021-06-26 105835.png" /></span></P><P>Thank you in advance,</P><P>S.Tarik</P> Sat, 26 Jun 2021 09:03:57 GMT https://community.nxp.com/t5/Other-NXP-Products/Buffer-size-for-SPI-communication-using-MC20XS4200-in-daisy/m-p/1298640#M11390 InHome 2021-06-26T09:03:57Z