Texas Instruments TMS320DM646x manual Network Octet Frames Register NETOCTETS

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Ethernet Media Access Controller (EMAC) Registers

5.50.31 Transmit and Receive 512 to 1023 Octet Frames Register (FRAME512T1023)

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.

5.50.32 Transmit and Receive 1024 to RXMAXLEN Octet Frames Register (FRAME1024TUP)

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.

5.50.33 Network Octet Frames Register (NETOCTETS)

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.

5.50.34 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 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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