i.MX6DQ USB Device Mode Wake-up Events.

[satoshishimoda]

Hi community,

Our customer have a question about i.MX6DQ USB.

Please see Chapter 65.3.5.2 and 65.3.5.2.1, we can see USB wake-up events when i.MX6DQ is in host mode.

However, we cannot find about Device Mode Events.

Would you kindly let me know the detail?

Best Regards,

Satoshi Shimoda

[Yuri]

Hello,

    A USB device is enabled for remote wakeup when its DEVICE_REMOTE_WAKEUP feature is set.

The USB specification state that host software must set the remote wakeup feature on a device.

Please refer to "Managing Remote Wakeup Devices" section in USB specs.

Have a great day,
Yuri

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[satoshishimoda]

Hello Yuri,

I think DEVICE_REMOTE_WAKEUP is the setting to enable remote wakeup (resume USB host by signal from device), but not wake up event to USB device.

And I found the following description in sect. .1.7.7 of USB specification.

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If a device is in the Suspend state, its operation is resumed when any non-idle signaling is received on its upstream facing port.

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So i.MX6DQ also wakes-up when any non-idle signaling is received on its upstream facing port if i.MX6DQ is USB device.

Is this correct?

If NXP adds a original wake-up event, would you let us know it.

Best Regards,

Satoshi Shimoda

[Yuri · Accepted solution]

Hello,

 Correct - "DEVICE_REMOTE_WAKEUP is the setting to enable remote wakeup (resume USB host
by signal from device) ...". 

  Yes, i.MX6DQ wakes-up when any non-idle signaling is received on its upstream facing port if i.MX6DQ

is USB device. There are no other  wake-up events for devices mode.

Regards,

Yuri.