In the meantime further data was written to the FIFO by the uC on the device. This is within USB spec, so no problem here. it found a checksum error (even though my protocol analyzer said otherwise) and issues a retransmission of the USB packet. For some reason the host controller decides the packet wasn't transferred correctly, i.e. The data is transferred into the FIFO chip correctly and transmitted to the USB-Side correctly. After investigating the issue it seems as if our problem is caused by the combination of a somewhat picky USB-Host and the FT245R chip: Data is transmitted from the device to the PC. Recently we spotted some protocol errors on one device communicating with an embedded PC. Hi Forum! I have been in contact with FTDI support for some weeks now, but so far I havn't gotten much of an answer besides them never having heard of my problem.
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