AM623: MCU_PORz Reset

li weiyu

Intellectual 970 points

Part Number: AM623

Tool/software:

Hi, TI expert!

I have a development environment for am6234, with our own evaluation board.

The software SDK version is PROCESSOR-SDK-LINUX-RT-AM62X-08.06.00.42.

The following register is used to obtain the reset source：

After I perform a reboot on Linux, I check the register values as follows：

It can be inferred that the above results are in line with expectations.

But when I set off to reset an MCU-PORz, I found that all the register values were 0：

But according to the image below, the reset triggered by MCU-PORz will only affect the MAIN and MCU domains. The register above belongs to the WKUP domain, why does its value reset to zero？

Is there any way to keep the value of the 0x43018178 register unchanged after triggering a reset in MCU-PORz？

Regards,

21 days ago

0 Swargam Anil 20 days ago

TI__Mastermind 34600 points

Hello Li,

I am looking at your queries and you may expect reply by today .

Regards,

Anil.

0 Swargam Anil 20 days ago in reply to Swargam Anil

TI__Mastermind 34600 points

Hello Li,

The RESET SRC Register holds the previous Reset reason status when you perform the Reset device.

If you perform the POR, the RESET SRC Register holds zero value and this is expected and the above behavior is correct.

If you perform the WarmReset , the above register holds Reset reason value and this is expected.

If this register value is zero, then we can say that the device goes to POR.

The links are helpful for reset topics.

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1421267/faq-am6x-device-reset-troubleshooting-document

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1407057/faq-reset-topic-on-am64x-am243-am62x-soc-s

li weiyu said:
But according to the image below, the reset triggered by MCU-PORz will only affect the MAIN and MCU domains. The register above belongs to the WKUP domain, why does its value reset to zero？

Sorry for this, actually when you perform POR everything goes to Reset and all domains registers (MAIN,MCU and WKUP) have the Reset values.

Regards,

Anil.

0 li weiyu 20 days ago in reply to Swargam Anil

Intellectual 970 points

I found a voltage monitoring pin in TRM. Is there a register corresponding to VMON? Through this register, we can know if the system has been powered off and then powered on again?

0 Swargam Anil 20 days ago in reply to li weiyu

TI__Mastermind 34600 points

Hello Li,

Can you please confirm what you are trying to do here ?

You wanted to confirm if the device went through the POR or not ?

Regards,

Anil.

0 li weiyu 20 days ago in reply to Swargam Anil

Intellectual 970 points

Swargam Anil said:
You wanted to confirm if the device went through the POR or not ?

After internal discussions, our current goal is to implement this requirement.

0 Swargam Anil 20 days ago in reply to li weiyu

TI__Mastermind 34600 points

Hello Li,

In the PRCOESSOR SDK and MCU+SDK, we are checking RST SRC register value , if the register value is zero , then we are confirming that the device went through the POR.

So, my suggestion is why you can't use this method. Just check the register value and see if it is zero or not, then confirm the device went through the POR and in all Reset cases, like Reset through Sw or Hw or Watchdog Reset from Application cores or DMSC cores, the RST SRC register has the content and not having zeros.

Regards,

Anil.

0 li weiyu 20 days ago in reply to Swargam Anil

Intellectual 970 points

Regarding POR, we also want to differentiate it, as described in this post：

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1453792/am623-por

+1 Swargam Anil 20 days ago in reply to li weiyu

TI__Mastermind 34600 points

Hello Li,

This is not possible at SOC level.

Since in both cases, the SOC went through the POR, and we can't be differentiated.

In both cases, the RST SRC Register has content zero, and it does not know whether the Reset came from the Power cut off or. MCU POR Pin.

Regards,

Anil.

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AM623: MCU_PORz Reset