Help Needed On EHCI.

[usb help]

Hi All,
   
  I am trying to port  NetBSD: EHCI Stack ver1.88 on to our soc which have EHCI controller, I am able to bring up the stack on our board, The stack start enumerating the high speed device when plugged on the port and fails in between.It sets the device address to 2, but when the host requests the "device descriptor" on endpoint = 0 addr =2, we are able to see 8 byte of data(device descriptor) put by the device on the bus during the data stage, but the host controller is failing to return ACK for that.When bus traces are captured, we noticed the error message "turnaround/timeout error". Can anyone tell me why this is happening & the point where to start debug.
   
  Any help will be greatly appreciated.
   
  -Rah
   
   

				
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