GPIF Data Transfer Failure during ZLP – KBA90259

Version: **

 

Question: Why does the GPIF data transfer fail during a zero-length packet (ZLP)?

 

Answer:

Some data transfer errors may be seen if a ZLP is followed very quickly (for example, within one microframe or 125 μs) by another data packet on a burst-enabled USB IN endpoint operating at Super Speed.
The solution is to ensure that you allow some time to elapse between a ZLP and the next data packet on burst-enabled USB IN endpoints.