iMX7ULP Power-On-Reset v.s. Pin RESET

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iMX7ULP Power-On-Reset v.s. Pin RESET

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Contributor I

HI ALL,

I'm using iMX7ULP to check how it works with eMMC.

While I tried pulling up the PIEZO_PWM pin which renders DDR mode for boot-up, it failed booting.

After getting failed, it just kept hanging in there. I couldn't fix it up through POR but Pin reset by toggling RESET 0/1.

I'm wondering why's that... cuz I found out from the datasheet as follows.

XinsunCHEN_0-1600744439152.jpeg

If it worked fine as mentioned above that POR would reset boot pins, it shouldn't've got this situation I suppose....

So could anyone tell me what's the difference between POR, PIN reset, RESET0/1?

 

Thanks.

Xinsun

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4 Replies

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NXP TechSupport
NXP TechSupport

RESET0 is the Power-On Reset (POR) signal for the whole SoC, whereas RESET1 only resets the A7 core.

Best Regards,
Artur

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Contributor I

Hi @art ,

Thanks for explanation.

Best regards,

Xinsun

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NXP Employee
NXP Employee

Hi @XinsunCHEN 

So we understood from your statement that, After toggling the reset pin you are able to Boot.

This seems Power-up sequence-related issue.

Please confirm the reset pin is for i.MX7 not for other interfaces or power.

Regards,

Mrudang

 

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Contributor I

Hi @mrudang_shelat ,

Thanks for your reply.

Yes the reset pin is for i.MX7.

Sincerely.

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