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5.49.34 Receive FIFO or DMA Start of Frame Overruns Register (RXSOFOVERRUNS)
5.49.35 Receive FIFO or DMA Middle of Frame Overruns Register (RXMOFOVERRUNS)
5.49.36 Receive DMA Overruns Register (RXDMAOVERRUNS)
Ethernet Media Access Controller (EMAC) Registers
The total number of frames received on the EMAC that had either a FIFO or DMA start of frame (SOF)
overrun. An SOF overrun frame is defined as having all of the following:
• Was any data or MAC control frame that matched a unicast, broadcast, or multicast address, or
matched due to promiscuous mode
• Was of any size (including less than 64-byte and greater than RXMAXLEN-byte frames)
• The EMAC was unable to receive it because it did not have the resources to receive it (cell FIFO full
or no DMA buffer available at the start of the frame).
CRC errors, alignment errors, and code errors have no effect on this statistic.
The total number of frames received on the EMAC that had either a FIFO or DMA middle of frame
(MOF) overrun. An MOF overrun frame is defined as having all of the following:
• Was any data or MAC control frame that matched a unicast, broadcast, or multicast address, or
matched due to promiscuous mode
• Was of any size (including less than 64-byte and greater than RXMAXLEN-byte frames)
• The EMAC was unable to receive it because it did not have the resources to receive it (cell FIFO full
or no DMA buffer available after the frame was successfully started - no SOF overrun).
CRC errors, alignment errors, and code errors have no effect on this statistic.
The total number of frames received on the EMAC that had either a DMA start of frame (SOF) overrun
or a DMA middle of frame (MOF) overrun. A receive DMA overrun frame is defined as having all of the
following:
• Was any data or MAC control frame that matched a unicast, broadcast, or multicast address, or
matched due to promiscuous mode
• Was of any size (including less than 64-byte and greater than RXMAXLEN-byte frames)
• The EMAC was unable to receive it because it did not have the DMA buffer resources to receive it
(zero head descriptor pointer at the start or during the middle of the frame reception).
CRC errors, alignment errors, and code errors have no effect on this statistic.
116 Ethernet Media Access Controller (EMAC)/ SPRU941A – April 2007
Management Data Input/Output (MDIO)
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