WG82574L S LBA8 Intel, WG82574L S LBA8 Datasheet - Page 124

• 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

7.1.4.4
7.1.4.5
7.1.4.6
7.1.4.7
124
Packet Checksum (16-Bit, Offset 0.48)
For standard 802.3 packets (non-VLAN) the packet checksum is by default computed
over the entire packet from the first byte of the DA through the last byte of the CRC,
including the Ethernet and IP headers. Software can modify the starting offset for the
packet checksum calculation via the Receive Checksum Control register (RXCSUM).
This register is described in
the packet checksum, software must adjust the packet checksum value to back out the
bytes that are not part of the true TCP checksum. Likewise, for fragmented UDP
packets, the Packet Checksum field can be used to accelerate UDP checksum
verification by the host processor. This operation is enabled by the RXCSUM.IPPCSE bit
as described in
For packets with VLAN header the packet checksum includes the header if VLAN
striping is not enabled by the CTRL.VME bit. If VLAN header strip is enabled, the packet
checksum and the starting offset of the packet checksum exclude the VLAN header.
This field is mutually exclusive with the RSS hash. It is enabled when the
RXCSUM.PCSD bit is cleared.
IP Identification (16-Bit, Offset 0.32)
This field stores the IP Identification field in the IP header of the incoming packet. The
software device driver should ignore this field when IPIDV is not set.
This field is mutually exclusive with the RSS hash. It is enabled when the
RXCSUM.PCSD bit is cleared.
RSS Hash (32-Bit, Offset 0.32)
This field is mutually exclusive with the IP identification and the packet checksum. It is
enabled when the RXCSUM.PCSD bit is set. This field contains the result of the
Microsoft* RSS hash function.
Extended Status (20-Bit, Offset 8.0)
PKTTYPE (bits 19:16) - Packet type
ACK (bit 15) - ACK packet indication
Reserved (bits 14:11) - Reserved
IPIDV
19
9
TST
18
8
PKTTYPE
section
Rsvd
17
7
10.2.5.15.
section
IPCS
16
6
10.2.5.15. To verify the TCP/UDP checksum using
TCPCS
ACK
15
5
UDPCS
14
4
82574 GbE Controller—Inline Functions
VP
13
3
Reserved
Rsvd
12
2
EOP
11
1
UDPV
DD
10
0