iMX7Solo USB serial downloader not recognized

[igal_kagan]

Hello.

I'm using iMX7Solo device in my board. I'm trying to connect to the device by USB serial downloader, but PC not recognize any USB device. 

Note: I set BOOT_MODE to "01" and all the voltages are OK, RESET de-asserted. 

When I'm connecting with JTAG, it recognizes the Cortex A, and Cortex M cores without any problem. But no USB activity at all.

Please, help me to solve this issue.

Thanks.

Best regards,

Igor.

[igal_kagan]

Additionals:

Power rails snapshot OK:

BOOT_MODE[1:0] pins are settled before RST de-asserted:

eFuse Manufacturing mode is 1: 0x30350490=0x00800000

But, still there no USB detection on the PC...

Please, help me solve this issue.

Thanks.

Best regards,

Igor.

[AldoG · Accepted solution]

Hello,

My first suggestion would be to check that the VBUS supply on the OTG connector is default as off when the boards power up, and should be the processor which turn it on as specified n the Hardware design guide.

Does one of the snapshots correspond to this?

Best regards,
Aldo.

[igal_kagan]

The problem was Vbus voltage.

Thanks a lot!

Igor.