Hello community,
In i.MX7D-SABRE, if 5VDC in and SW1 on, board will start up immediately.
We hope to keep OFF mode after SW1 on and start boot up by pushed ONOFF button.
In Table 6-8. Power mode transitions of i.MX7 reference manual (IMX7DRM rev1),
It say that "2. When button is pressed, 'state' goes ON,PMIC_ON_REQ goes '1'."
Does we can control by ONOFF button of first time power on sequence?
I already removed both R280 and R307 registers connect to PWRON pin of PMIC.
Best regards,
Ishii.
Solved! Go to Solution.
Hello,
After VDD_SNVS_IN is ON, PMIC_ON_REQ is asserted, therefore hardly
it is possible to avoid system start at the first time power on.
Also, please take in account the following: it is highly recommended
to remove power (voltage source) to all components on the board in
the event of a processor reset. This avoids having to determine if a component
critical to rebooting the processor is in the necessary state to support
a reboot. Such devices as eMMC memory card (if the hardware RST_B pin
is not connected), SD Card (if the reset pin is not used to remove power to the
SD Card), QSPI, NOR, LPDDR2/3 memory may be left in improper state after
CPU reset.
Have a great day,
Yuri
------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer
button. Thank you
Hello,
After VDD_SNVS_IN is ON, PMIC_ON_REQ is asserted, therefore hardly
it is possible to avoid system start at the first time power on.
Also, please take in account the following: it is highly recommended
to remove power (voltage source) to all components on the board in
the event of a processor reset. This avoids having to determine if a component
critical to rebooting the processor is in the necessary state to support
a reboot. Such devices as eMMC memory card (if the hardware RST_B pin
is not connected), SD Card (if the reset pin is not used to remove power to the
SD Card), QSPI, NOR, LPDDR2/3 memory may be left in improper state after
CPU reset.
Have a great day,
Yuri
------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer
button. Thank you
Hello Yuri,
Thank you for your response.
I will answer it to my customer.
Best regards,
Ishii.