Ethernet Media Access Controller (EMAC)/ Management Data Input/Output (MDIO) Module User's Guide

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5.50.31 Transmit and Receive 512 to 1023 Octet Frames Register (FRAME512T1023)
5.50.32 Transmit and Receive 1024 to RXMAXLEN Octet Frames Register (FRAME1024TUP)
5.50.33 Network Octet Frames Register (NETOCTETS)
5.50.34 Receive FIFO or DMA Start of Frame Overruns Register (RXSOFOVERRUNS)
Ethernet Media Access Controller (EMAC) Registers
The total number of 512-byte to 1023-byte frames received and transmitted on the EMAC. Such a
frame is defined as having all of the following:
• Any data or MAC control frame that was destined for any unicast, broadcast, or multicast address
• Did not experience late collisions, excessive collisions, underrun, or carrier sense error
• Was 512-bytes to 1023-bytes long
CRC errors, alignment/code errors, and overruns do not affect the recording of frames in this statistic.
The total number of 1024-byte to RXMAXLEN-byte frames received and transmitted on the EMAC.
Such a frame is defined as having all of the following:
• Any data or MAC control frame that was destined for any unicast, broadcast, or multicast address
• Did not experience late collisions, excessive collisions, underrun, or carrier sense error
• Was 1024-bytes to RXMAXLEN-bytes long
CRC/alignment/code errors, underruns, and overruns do not affect frame recording in this statistic.
The total number of bytes of frame data received and transmitted on the EMAC. Each frame counted
has all of the following:
• Was any data or MAC control frame destined for any unicast, broadcast, or multicast address
(address match does not matter)
• Was of any size (including less than 64-byte and greater than RXMAXLEN-byte frames)
Also counted in this statistic is:
• Every byte transmitted before a carrier-loss was experienced
• Every byte transmitted before each collision was experienced (multiple retries are counted each
time)
• Every byte received if the EMAC is in half-duplex mode until a jam sequence was transmitted to
initiate flow control. (The jam sequence is not counted to prevent double-counting).
Error conditions such as alignment errors, CRC errors, code errors, overruns, and underruns do not
affect the recording of bytes in this statistic. The objective of this statistic is to give a reasonable
indication of Ethernet utilization.
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.
SPRUEQ6 – December 2007 Ethernet Media Access Controller (EMAC)/Management Data Input/Output (MDIO) 131
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