i.MX7 USB Low Power Boot.

[satoshishimoda]

Hi community,

Our customer have a question about i.MX7 USB Low Power Boot.
Please see chapter 6.6.11 in IMX7DSRM Rev.0.1.
They want to know whether i.MX7 always enters USB Low Power Boot if LPB_BOOT=10b or 11b.

I understand it is not always, but if satisfied Figure 6-46 flow, there is a possibility to enter to USB Low Power Boot even if enough power is supplied from PMIC.
Is my understanding correct?

Best Regards,
Satoshi Shimoda

[Yuri · Accepted solution]

Hello,

   Generally Your understanding is correct. Also, please take into account, that 

"If LPB_BOOT fuses are blown, the Chip will check if there is low power condition via
GPIO_3 pad. [...] Polarity of low power boot condition on GPIO_3 pad is set
by BT _LPB_POLARITY fuse. "

Have a great day,
Yuri

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