WG82574L S LBA8 Intel, WG82574L S LBA8 Datasheet - Page 125

• Manufacturer Part Number: WG82574L S LBA8
• Manufacturer: Intel

Specifications of WG82574L S LBA8

• Operating Supply Voltage (typ): 3.3V
• Operating Temp Range: 0C to 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 64
• Lead Free Status / RoHS Status: Compliant

Inline Functions—82574 GbE Controller
UDPV (bit 10) - Valid UDP XSUM
IPIDV (bit 9) - IP identification valid
TST (bit 8) - Time stamp taken
Rsvd (bit 7) - Reserved
IPCS (bit 6) IPv4 checksum calculated on packet - same as legacy descriptor.
TCPCS (bit 5) - TCP checksum calculated on packet - same as legacy descriptor.
UDPCS (bit 4) - UDP checksum calculated on packet.
VP (bit 3) - Packet is 802.1q (matched VET) - same as legacy descriptor.
Rsv (bit 2) - Reserved
EOP (bit 1) - End of packet - same as legacy descriptor.
DD (bit 0) - Descriptor done - same as legacy descriptor.
DD EOP IXSM VP UDPCS TCPCS IPCS: Same meaning as in the legacy receive
descriptor.
IPCS TCPCS UDPCS: The meaning of these bits is shown in the following table:
Unsupported packet types do not have the IPCS or TCPCS bits set. IPv6 packets do not
have the IPCS bit set, but might have the TCPCS bit set if the 82574 recognized the
TCP or UDP packet.
IPIDV (bit 9): The IPIDV bit indicates that the incoming packet was identified as a
fragmented IPv4 packet. The IPID field contains a valid IP identification value if the
RXCSUM.PCSD is cleared.
UDPV (bit 10): The UDPV bit indicates that the incoming packet contains a valid (non-
zero value) checksum field in an incoming fragmented UDP IPv4 packet. It means that
the Packet Checksum field contains the UDP checksum as described in this section.
When this field is cleared in the first fragment that contains the UDP header, it means
that the packet does not contain a valid UDP checksum and the checksum field in the
Rx descriptor should be ignored. This field is always cleared in incoming fragments that
do not contain the UDP header.
TCPCS
0b
1b
0b
1b
UDPCS
0b
0b
1b
1b
1b/0b
1b/0b
1b/0b
1b/0b
IPCS
Hardware provides IPv4 checksum offload if IPCS active.
Hardware provides IPv4 checksum offload if IPCS active and TCP
checksum offload. Pass/fail indication is provided in the Error field
– IPE and TCPE.
For IPv4 packets, hardware provides IP checksum offload if IPCS
active and fragmented UDP checksum offload. IP Pass/fail
indication is provided in the IPE field. Fragmented UDP checksum
is provided in the packet checksum field if the RXCSUM.PCSD bit is
cleared.
Hardware provides IPv4 checksum offload if IPCS active and UDP
checksum offload. Pass/fail indication is provided in the Error field
– IPE and TCPE.
Functionality
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