Question about JTAG circuit on DEVKIT 5744P

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Question about JTAG circuit on DEVKIT 5744P

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ianlee1
Contributor II

Hi Sir,

I have a question about JTAG circuit on DEVKIT 5744P.  On the DEVKIT, it's only use R22, and R23 is empty.

If I add 0 Ohm resistors on R23, that mean R22 and R23 are not empty.  Could the JTAG  work properly?

Thanks for your help.

pastedImage_1.jpg

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4 Replies

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lukaszadrapa
NXP TechSupport
NXP TechSupport

Hi,

it's better to use only one of the resistors. To see the difference:

lukaszadrapa_0-1598945394577.png

 

Regards,

Lukas

 

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ianlee1
Contributor II

Hi Sir, 

Thanks for your reply.

As you say, does it mean the JTAG-RSTx pin need connect the "Reset Input/ Output" circuit firstly than connect to MCU-RSTx pin , and can not connect MCU-RSTx pin directly? 

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lukaszadrapa
NXP TechSupport
NXP TechSupport

Hi,

MCU-RSTx can be connected directly to JTAG connector. But there's no advantage to have both resistors R22 and R23 populated.

Regards,

Lukas

 

 

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ianlee1
Contributor II

Hi,

Thanks for your reply.

I encounter the error message on S32DS by using Multilink FX as below when I populated R22 and R23, but if I only populated R22, the 5744P downloading is fine. If R22 and R23 both are populated, 

how do I set the S32DS  to solve this problem?

 

1599531988779.jpg

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