54L15dk debug in is not woring

[William.wei]

hi support team，

customer told me 54L15dk debug out is not able to program another 54L15 chip.

so i tried, 

1. A-54L15dk debug out program B-54L15dk debug in, failed.

2. B-54L15dk debug out program A-54L15dk debug in, failed.

3. 7002dk debug out program 54l15dk debug in, failed.

4. 54L15dk debug out program 7002dk debug in, OK.

 

from customer side, they want to using 54l15dk to program their products, i coud't find the problem, please help.

thanks in advance.

Regards,

William.

[Ressa]

Hi,

Thanks for contacting us.
Just to make sure we are on the same ground, the customer wants to use nRF54l14 DK to program other custom boards which have nRF54L15. If this is correct then wouldn't they need to use just Debug out port of DK ? 
For debug in, I don't see any pre-soldered connector for Debug-in on the DK ( my dk version is 1.0.0). There is an empty place for soldering connector for debug-in use case. Not sure which version of DK you are using. Have you checked to see if the soldered connector is in correct place? as it is next to the Trace connector it can be confusing. 

Best regards,
Ressa

[William.wei]

Yes,they want use 54L15dk debug out to program their products.

Ressa said:

Just to make sure we are on the same ground, the customer wants to use nRF54l14 DK to program other custom boards which have nRF54L15. If this is correct then wouldn't they need to use just Debug out port of DK ? 

my 54L15 dk is 0.9.1 and there is  a solder in dk as below, 

according to customer, 54L15dk debug out is also not able to program their product, only chip swd interface.

Regards,

William.

[Ressa]

To program an external board using the Debug out connector, make sure the SELECT pin is connected to GND on the external board. This connection tells the interface MCU to program the external target instead of the onboard SoC (dk SoC). Also make sure the voltage level on both boards are similar. 

[William.wei]

i tested 54L15 debug out is able to program 7002dk, so debug out should be fine.

however, there is no way i can program 54L15 using debug in(from other debug out,  all of them failed(54L15 debug out, 7002 debug out, 5340 debug out)).

[PaKa]

To make sure: you have a cable that is less then 10cm long?

You have the same VDD level on the DK doing the programming as the target board?

[William.wei]

may i ask why the cable should less then 10cm long?

my cable is 20cm.

Regards,

William.

[Ressa]

Longer cables may not work reliably. There have been issues reported related to longer cables for programming. Short cables help to maintain signal integrity. You should be able to use longer cables as long as you have full control on signal along the cable. You might need to use decupling capacitors on each wire to filter out unwanted interference/couplings.

[PaKa]

There are issues with the cable length and the design team says "less than 10cm" for the nRF54 kits when using the external programming opion so going longer is unlikely to work.