GPIF Data Transfer Failure during ZLP – KBA90259 | Cypress Semiconductor
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GPIF Data Transfer Failure during ZLP – KBA90259
Why does the GPIF data transfer fail during a zero-length packet (ZLP)?
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.