AM6422: PORZ_OUT pulse issue

Hello Ethan, 

Thank you for the query.

is the customer seeing this pulse during power-up.

Can you please ask customer to capture the MCU_PORx signal.

Regards,

Sreenivasa

Hi Sreenivasa

Below figure is the waveform during power up (MCU_POR is blue, PORZ_OUT is yellow):

From the timing, looks like the workaround in the boot code fix MDIO issue of errata.

U-Boot SPL 2021.01 (Jul 31 2023 - 11:31:58 +0900)
Resetting on cold boot to workaround ErrataID:i2331
resetting ...

U-Boot SPL 2021.01 (Jul 31 2023 - 11:31:58 +0900)
SYSFW ABI: 3.1 (firmware rev 0x0008 '8.4.7--v08.04.07 (Jolly Jellyfi')
SPL initial stack usage: 13424 bytes

Hello Tony, 

Thank you.

Ethan, could you please request customer to capture the Resetstatz and the MCU_Resetstatz outputs along with the PORz_Out and the MCU_PORz input.

Regards,

Sreenivasa

Thanks Tony!

Hi Sreenivasa  and Tony

Customer tested Resetstatz and the MCU_Resetstatz outputs along with the PORz_Out:

Regarding the boot code, do you mean it’s the code in ROM?

Customer didn’t find same errata log from their serial port message:

Hello Ethan, 

Thank you.

I cant see the PORz_OUT pulse.

Please confirm.

Regards,

Sreenivasa

Hello Sreenivasa

Please see the PORz_OUT picture on below reply

Ethan Tian said:

Below figure is the waveform during power up (MCU_POR is blue, PORZ_OUT is yellow):

Hello Ethan,

Thank you.

Ethan Tian said:

Below figure is the waveform during power up (MCU_POR is blue, PORZ_OUT is yellow):

I do not see the pulse that you initially reported initially in the PORZ_OUT is yellow waveform. Any thoughts.

Regards,

Sreenivasa

Hi Sreenivasa

The time interval on the PORz_OUT horizontal axis of the picture with pulses is 500us, and the time interval of the subsequent picture is 50ms.

Hello Ethan,

Thank you.

I see a difference of 200 mS between PORz_OUT and the RESETSTATz, MCU_RESETSTATz

Can you please check if the MCU_RESETz or RESET_REQz is being controlled by an external input?

Regards,

Sreenivasa

Hello Ethan,

Thank you.

Please refer the expected waveform at the output after MCU_PORz

Regards,

Sreenivasa