i.MX ProcessorsのトピックRe: i.MX8 Mini JTAG Interface https://community.nxp.com/t5/i-MX-Processors/i-MX8-Mini-JTAG-Interface/m-p/917122#M138031 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>So sorry for late reply. I have confirmed it for you. The power domain of POR_B is VSNVS, the power domian of Jtag IO is DCDC_3V3. External Jtag device output nRST signal to our system, its power domain is different our system.&nbsp;So&nbsp;D1905 and D1906 is for isolation of different power domain, in order to keep the current from flowing back.</P><P>Hope this can do help for you.</P><P>Have a nice day</P><P>Best Regards</P><P>Rita</P></BODY></HTML> Wed, 05 Jun 2019 07:28:48 GMT Rita_Wang 2019-06-05T07:28:48Z i.MX8 Mini JTAG Interface https://community.nxp.com/t5/i-MX-Processors/i-MX8-Mini-JTAG-Interface/m-p/917121#M138030 <HTML><HEAD></HEAD><BODY><P>Looking at the schematics for the 8MMINILPD4 base board design JTAG interface to the processor I am curious about the functionality and purpose of diodes D907 and D908.&nbsp; Are these used to to control the nRST and keep the JTAG from overriding POR_B?&nbsp; I have the snapshot from the schematic showing the diodes in question.</P><P></P><P><span class="lia-inline-image-display-wrapper" image-alt="pastedImage_2.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/84048i66C65BC61CE2A470/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_2.png" alt="pastedImage_2.png" /></span></P></BODY></HTML> Tue, 28 May 2019 23:05:07 GMT https://community.nxp.com/t5/i-MX-Processors/i-MX8-Mini-JTAG-Interface/m-p/917121#M138030 shawnnageli 2019-05-28T23:05:07Z Re: i.MX8 Mini JTAG Interface https://community.nxp.com/t5/i-MX-Processors/i-MX8-Mini-JTAG-Interface/m-p/917122#M138031 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>So sorry for late reply. I have confirmed it for you. The power domain of POR_B is VSNVS, the power domian of Jtag IO is DCDC_3V3. External Jtag device output nRST signal to our system, its power domain is different our system.&nbsp;So&nbsp;D1905 and D1906 is for isolation of different power domain, in order to keep the current from flowing back.</P><P>Hope this can do help for you.</P><P>Have a nice day</P><P>Best Regards</P><P>Rita</P></BODY></HTML> Wed, 05 Jun 2019 07:28:48 GMT https://community.nxp.com/t5/i-MX-Processors/i-MX8-Mini-JTAG-Interface/m-p/917122#M138031 Rita_Wang 2019-06-05T07:28:48Z