FAQs
English (US) 日本語 | Japanese 中文 | Chinese (Simplified)

i.MX8 Mini JTAG Interface

cancel
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for 
Show  only  | Search instead for 
Did you mean: 

i.MX8 Mini JTAG Interface

‎05-28-2019 04:05 PM
930 Views
shawnnageli
Contributor II

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.  Are these used to to control the nRST and keep the JTAG from overriding POR_B?  I have the snapshot from the schematic showing the diodes in question.

pastedImage_2.png

Labels (1)
0 Kudos
Reply
1 Reply

‎06-05-2019 12:28 AM
755 Views
Rita_Wang
NXP TechSupport
NXP TechSupport

Hi,

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. So D1905 and D1906 is for isolation of different power domain, in order to keep the current from flowing back.

Hope this can do help for you.

Have a nice day

Best Regards

Rita

0 Kudos
Reply