FX3 re-enumerates

Tip / Sign in to post questions, reply, level up, and achieve exciting badges. Know more

cross mob
lock attach
Attachments are accessible only for community members.
Anonymous
Not applicable

Hi,

   

  I am working on an FX 3 USB 3,0 device with CYUSB3014 and am seeing some device will re-enumerates(4/200).if we disable LPM using CyU3PUsbLPMDisable().it will be ok.

   

  we got same data with good device and bad device.show as attachments.

   

 Software:Advisor T3 USB Protocol Suite

0 Likes
2 Replies
Anonymous
Not applicable

Hi,

   

The some hosts may often force the USB Device to go to low power modes. The best approach is to disable LPM just before the data transfer begins and keep it disabled until Data transfers are finished. All the other times LPM may be enabled to allow USB Certification

0 Likes
Anonymous
Not applicable

Hi Madhu,  
   Thank you for your reply.  
   Is it mean that FX3 device can enable LPM only in idle time? But why does only 4 of 200 device will re-enumerates at the same USB controller(Hosts)? Most of them are good.  
   For more information please see CASE 3230941746 and [CASE 3239583050](https://secure.cypress.com/myaccount/?id=25&myCase=489394-3239583050)

0 Likes