Network Card User Manual

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Architecture

2.6.5.11 Pass 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.

2.6.5.12 Jabber 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.

2.6.5.13 Oversize 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.

2.6.5.14 Fragment 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.

2.6.5.15 Undersized 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.

2.6.5.16 Control 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.

2.6.5.17 Overrun Flag

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

receive overrun.

2.6.5.18 Code 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.

2.6.5.19 Alignment 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.

2.6.5.20 CRC 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.

2.6.5.21 No Match (NOMATCH) Flag

This flag is set by the EMAC in the SOP buffer descriptor, if the received packet did not pass any of the

EMAC’s address match criteria and was not discarded because the RXCAFEN bit was set in the

RXMBPENABLE. Although the packet is a valid Ethernet data packet, it was only received because the

EMAC is in promiscuous mode.

SPRUFI5B–March 2009–Revised December 2010 Ethernet Media Access Controller (EMAC)/Management Data Input/Output

(MDIO)

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