Texas Instruments TMS320DM646x manual Teardown Complete TDOWNCMPLT Flag, Pass CRC PASSCRC Flag

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Architecture

2.5.5.10Teardown Complete (TDOWNCMPLT) Flag

This flag is used when a receive queue is being torn down, or aborted, instead of being filled with received data. This would happen under device driver reset or shutdown conditions. The EMAC sets this bit in the descriptor of the first free buffer when the tear down occurs. No additional queue processing is performed.

2.5.5.11Pass CRC (PASSCRC) Flag

This flag is set by the EMAC in the SOP buffer descriptor if the received packet includes the 4-byte CRC. This flag should be cleared by the software application before submitting the descriptor to the receive queue.

2.5.5.12Jabber Flag

This flag is set by the EMAC in the SOP buffer descriptor, if the received packet is a jabber frame and was not discarded because the RXCEFEN bit was set in the RXMBPENABLE. Jabber frames are frames that exceed the RXMAXLEN in length, and have CRC, code, or alignment errors.

2.5.5.13Oversize Flag

This flag is set by the EMAC in the SOP buffer descriptor, if the received packet is an oversized frame and was not discarded because the RXCEFEN bit was set in the RXMBPENABLE.

2.5.5.14Fragment Flag

This flag is set by the EMAC in the SOP buffer descriptor, if the received packet is only a packet fragment and was not discarded because the RXCEFEN bit was set in the RXMBPENABLE.

2.5.5.15Undersized Flag

This flag is set by the EMAC in the SOP buffer descriptor, if the received packet is undersized and was not discarded because the RXCSFEN bit was set in the RXMBPENABLE.

2.5.5.16Control Flag

This flag is set by the EMAC in the SOP buffer descriptor, if the received packet is an EMAC control frame and was not discarded because the RXCMFEN bit was set in the RXMBPENABLE.

2.5.5.17Overrun Flag

This flag is set by the EMAC in the SOP buffer descriptor, if the received packet was aborted due to a receive overrun.

2.5.5.18Code Error (CODEERROR) Flag

This flag is set by the EMAC in the SOP buffer descriptor, if the received packet contained a code error and was not discarded because the RXCEFEN bit was set in the RXMBPENABLE.

2.5.5.19Alignment Error (ALIGNERROR) Flag

This flag is set by the EMAC in the SOP buffer descriptor, if the received packet contained an alignment error and was not discarded because the RXCEFEN bit was set in the RXMBPENABLE.

2.5.5.20CRC Error (CRCERROR) Flag

This flag is set by the EMAC in the SOP buffer descriptor, if the received packet contained a CRC error and was not discarded because the RXCEFEN bit was set in the RXMBPENABLE.

30 Ethernet Media Access Controller (EMAC)/Management Data Input/Output (MDIO) SPRUEQ6–December 2007

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