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CRC error in all USB SOF packets

Question asked by frank bolatoli on Jul 8, 2015
I'm running a stm32f427 on a custom board as Host, HS core, FS mode. 
When a device is attached I get an interrupt when the device is detected and the host starts sending SOF's. But the last bits in the SOF packet is at a strange voltage level. They are at 1.5 V, a half one!

Look at this scope image:

Anyone have seen this before or can explain it? 
The device does not reply on requests as it detects a CRC error.