i.MX ProcessorsのトピックRe: i.MX6DQ USB Device Mode Wake-up Events.

i.MX6DQ USB Device Mode Wake-up Events.

satoshishimoda — Thu, 08 Sep 2016 02:24:26 GMT

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

Re: i.MX6DQ USB Device Mode Wake-up Events.

Yuri — Thu, 08 Sep 2016 03:26:31 GMT

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

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

Re: i.MX6DQ USB Device Mode Wake-up Events.

satoshishimoda — Fri, 09 Sep 2016 09:57:49 GMT

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.

=====

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

====

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

Re: i.MX6DQ USB Device Mode Wake-up Events.

Yuri — Fri, 16 Sep 2016 04:58:37 GMT

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.