K60P100M100SF2RM Datasheet, PDF (1225/1809 Pages) Freescale Semiconductor, Inc – K60 Sub-Family Reference Manual

Chapter 44 10/100-Mbps Ethernet MAC (ENET)
44.4.16.2 Transmit FIFO Overflow
On the transmit path, when the FIFO reaches the programmable almost full threshold, the
internal MAC ready signal is deasserted. The application should stop sending new data .
However, if the application keeps sending data , the transmit FIFO overflows, corrupting
previously-stored contents. The core logic sets the enhanced TxBD[OE] bit for the next
frame transmitted to indicate this overflow occurence.
Note
Overflow is a fatal error and must be addressed by resetting the
core or clearing ENETn_ECR[ETHER_EN] to clear the FIFOs
and prepare for normal operation again.
K60 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc.
1225