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Ethernet Media Access Controller (EMAC) Registers
5.49.34 Receive FIFO or DMA Start of Frame Overruns Register (RXSOFOVERRUNS)
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
∙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.
5.49.35 Receive FIFO or DMA Middle of Frame Overruns Register (RXMOFOVERRUNS)
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
∙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.
5.49.36 Receive DMA Overruns Register (RXDMAOVERRUNS)
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
∙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
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