Intel IXP400 - page 278

Intel® IXP400 Software
Access-Layer Components: Synchronous Serial Port (IxSspAcc) API
April 2005 IXP400 Software Version 2.0 Programmer’s Guide
278 Document Number: 252539, Revision: 007
4. For an overrun:
a. Interrupt is triggered due to an overrun of the Rx FIFO.
b. Rx FIFO Overrun handler/callback is called.
c. Rx FIFO Overrun handler/callback extracts data from the Rx FIFO to prevent the overrun
from triggering again.
d. (processes data extracted and perform necessary steps to recover data loss if possible)
e. Rx FIFO Overrun handler/callback returns.
f. Interrupt is cleared