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USB on C6748

Hi, 

I am using USB Steallaris lib for communnicating with PC.

The question is about the "Start of frame" interrupt. 

From what I know the SOF is the Host's packet from here there is three scenarious:

  1. Device isn't connected -> there is no SOF -> there is no SOF interrupt and this the exact behavior of my device.
  2. Device connected -> there is SOF -> there is SOF interrupt and this the exact behavior of my device.
  3. Device disconnected after it was connected -> there no SOF -> there is no SOF interrupt, but I still have the SOF interrupt, is it correct?  What I am missing?
Thanks
Dani