How to read and write to OTP register for FS26 SBC

HemantK · ‎11-08-2022

Hello Community members,

I was wondering if some one could guide us with the following query:

We have S32K3X4EVB-Q172 Eval Board and have modified it so that Debug pin (FS26_VDEBUG) on FS26 chip remains at +8.0 V. The reason for doing this is so that SBC remains in "OTP emulation or programming" mode.

Currently all we are trying to do is to read an OTP register, OTP_SYS_CFG1 (0x20) by sending (0x4000006E) to SBC and getting response 0xDA0000B9 which means data to be 0x0000 which is not correct.

Can you please let us know if there is something missing or wrong?

The SBC chip on board is PFS26AMDA0WL2.

frunoo

@JozefKozon OTP Emulation mode requires some key access. That is written in AN13850 Section 6.3 OTP Emulation.

Does that mean, I must buy https://www.nxp.com/design/design-center/development-boards-and-designs/analog-toolbox/fs26-safety-s... ? Or is there another way to use OTP Emulation mode?

JozefKozon

@frunoo

yes, that is correct. You need the Evaluation board and the GUI.

With Best Regards,

Jozef

frunoo

Without that kit, using any MCU & SPI communication, can I write OTP registers in OTP mode? Or do I definitely need that KITFS26SKTEVM programming board?

JozefKozon

@frunoo

other customers ask this too. The answer from the application team is, that reading the OTP via SPI is for NXP internal use only. You need to use the Evaluation board and GUI.

With Best Regards,

Jozef

JozefKozon · ‎11-09-2022

Hello Hemant,

please check the DBG_MODE bit in the FS_STATES register (latched information) and/or the bit VDBG_VOLT_S in the M_STATUS (real time information) register to confirm, that the FS26 is in Debug mode.

There is a flowchart in the Figure 72. in the FS26 datasheet explaining the steps to enter OTP emulate or program mode. Please check it and confirm, that you have followed the steps.

The FS26 datasheet can be download from the FS26 product page under the secure files.

With Best Regards,

Jozef

Robert_Wang · ‎08-07-2023

Dear Jozef

how to use NXP GUI to make FS26 enter into OTP emulation mode? Since, the UG of the FS26 EV-kit tell me that I should make FS26 enter the debug mode by applying a ~4.5V on its DEBUG pin, however, the DS of FS26 tell me that I should make FS26 enter the OTP emulation mode by applying a 8V on its DEBUG pin, which one is correct?

and how can I change the VCORE/ LDO1/ LDO2 etc regulators output voltage during the engineering test stage with NXP GUI?

Best Regards,

Robert