AM623: rtc power management

Hello Li,

What information are you trying to save within these registers? It looks like there are only eight 32-bit registers to use. Off the top of my head, I am not sure if these registers are used by any of the TI software.

I suppose you could try reading the register addresses with devmem2 in order to see if anything is currently written to those registers on your board?

I am sending your thread to a member of our hardware team to discuss how to connect battery backup to the AM62x.

Regards,

Nick

Hello Nick,

Nick Saulnier said:

What information are you trying to save within these registers? It looks like there are only eight 32-bit registers to use. Off the top of my head, I am not sure if these registers are used by any of the TI software.

We want to use these registers to store some boot information.
In actual testing, these registers do indeed have values. I am not sure if TI has already used these registers. Could you please help confirm if TI has already used these registers?

Regards,
Li

Hello Li, 

Nick Saulnier said:

I am sending your thread to a member of our hardware team to discuss how to connect battery backup to the AM62x.

I am not sure connecting the battery to the SOC is a use case that has been considered.

we have other processor families in road map that could support the functionality.

Regards,

Sreenivasa

Hello Sreenivasa,
We are not currently considering changing the processor, we just want to know if the function of connecting the battery to the SOC has been implemented on the am6234 chip

Regards,
Li

Hello Li, 

Thank you.

li weiyu said:

We are not currently considering changing the processor, we just want to know if the function of connecting the battery to the SOC has been implemented on the am6234 chip

This is not implemented or supported.

Regards,

Sreenivasa

Hello Sreenivasa, 

li weiyu said:

My question is, if we want to implement the function of saving data in case of power failure, how can the RTC module inside am62x keep running when the system is powered off?

If that's the case, won't the data stored in the RTC_STC_SCRTCH0_N register be lost after the system is powered off？

What is the application scenario of the RTC-STC_SCRTCH0_N register designed by TI？

Regards,
Li

Hello Li, 

Thank you.

Let me check internally and update you.

Regards,

Sreenivasa

Hello Sreenivasa, 

Has there been any new update on this issue?

Regards,
Li

Hello Li, 

The register is part of the IP and does not have an use case for AM625

li weiyu said:

If that's the case, won't the data stored in the RTC_STC_SCRTCH0_N register be lost after the system is powered off？

What is the application scenario of the RTC-STC_SCRTCH0_N register designed by TI？

This is correct. The data will not be retained when the SOC is powered-off.

Regards,

Sreenivasa

Hello Sreenivasa, 

Kallikuppa Sreenivasa said:

The register is part of the IO and does not have an use case for AM625

What exactly do you mean by 'IO' here？

Kallikuppa Sreenivasa said:

What is the application scenario of the RTC-STC_SCRTCH0_N register designed by TI？

So how should we explain this？

Overall, can I understand that this register cannot be used to implement the function of power down saving？Because the battery cannot be connected to SOC for this register to retain data？

Regards,
Li