This anomaly applies to IC Rev. Engineering A, build codes QIAA-AA0.
DMA transfer is not as long as configured. Only the 8 least significant bits of RXD.MAXCNT and TXD.MAXCNT registers are functional.
RXD.MAXCNT and/or TXD.MAXCNT are configured for DMA transfers > 255 bytes.
EasyDMA transfer sizes longer than 255 bytes are not supported. Larger size values are treated modulo 256.
Split long transfers into chunks of 255 bytes or less.