S32K3 - C40_IP_ERROR occurred while writing the JTAG password

[ssean]

Hello NXP Team.

Referring to the example below, I implemented the JTAG Password function.

https://community.nxp.com/t5/S32K-Knowledge-Base/S32K3-Restrict-the-debug-access-with-a-password-whe...

In most cases, it works without any issues, but on some PCBs, when attempting to write to address 0x1B000080, a STATUS_C40_IP_ERROR occurs.

When the error occurs, if I perform a RESET and retry, the Write completes without any issue.
Could you please let me know in what cases a STATUS_C40_IP_ERROR is expected to occur?

BRs,

Suhyun Sung.

[VaneB · Accepted solution]

Hi @ssean 

We have seen similar issues reported by other users, and in some cases, the problem was solved by enabling the "Mem Synchronize Cache" feature in the C40_Ip driver using ConfigTools.

Additionally, it is important to ensure that the clock ratios between domains are correctly configured. For this, we recommend carefully following the guidelines provided in the System Clocking Configurations chapter of the S32K3 Reference Manual.

BR, VaneB