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How can we prevent a receive fifo overrun on an MCF5235 FEC

Question asked by Ahlan Marriott on Jan 16, 2014
Latest reply on Jan 30, 2014 by TomE

We have an MCF5235 @ 150MHz connected to a Texas tlk100 transceiver using MMI

Everything works "mostly"

Occasionsally we lose an ethernet frame.

The OV bit is set in the receive buffer and the count of "receive fifo overuns" is incremented.

This happens even on 10Mb ethernet.

The receive buffer is in DRAM.


The fifo is at its default setting of 0x500 for receive (out of 0x600)


Has anyone any idea what we must do in order to prevent receive fifo overruns?


Best wishes,