WG82574L S LBA9 Intel, WG82574L S LBA9 Datasheet - Page 137

• Manufacturer Part Number: WG82574L S LBA9
• Description: CONTROLLER, ENET, INTEL 82574L, 64PQFN
• Manufacturer: Intel

Specifications of WG82574L S LBA9

• Ethernet Type: IEEE 802.3, IEEE 802.3u, IEEE 802.3ab
• Supply Voltage Range: 3V To 3.6V
• Operating Temperature Range: 0°C To +85°C
• Digital Ic Case Style: QFN
• No. Of Pins: 64
• Package / Case: QFN
• Interface Type: I2C, JTAG, PCI, SPI
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Inline Functions—82574 GbE Controller
7.1.4.8.1
Note:
CE (bit 4) - CRC error or alignment error - Same as legacy descriptor.
Reserved (bits 7, 3:0) - Reserved
RXE IPE TCPE CXE SEQ SE CE: Same as legacy descriptor.
Length (16-bit, offset 8.32): Same as the length field at offset 8.0 in the legacy
descriptor.
VLAN Tag (16-bit, offset 8.48): Same as legacy descriptor.
Receive UDP Fragmentation Checksum
The 82574L might provide receive fragmented UDP checksum offload. The following
setup should be made to enable this mode:
RXCSUM.PCSD bit should be cleared. The Packet Checksum and IP Identification fields
are mutually exclusive with the RSS hash. When the PCSD bit is cleared, Packet
Checksum and IP Identification are active.
RXCSUM.IPPCSE bit should be set. This field enables the IP payload checksum enable
that is designed for the fragmented UDP checksum.
RXCSUM.PCSS field must be zero. The packet checksum start should be zero to enable
auto start of the checksum calculation. See the following table for an exact description
of the checksum calculation.
The following table lists the outcome descriptor fields for the following incoming
packets types:
When the software device driver computes the 16-bit ones complement sum on the
incoming packets of the UDP fragments, it should expect a value of 0xFFFF. See
section 7.1.10
None IPv4
Packet
Fragment
IPv4 with TCP
header
Non-
fragmented
IPv4 packet
Fragmented
IPv4 without
transport
header
Fragmented
IPv4 with UDP
header
Packet Type
Incoming
Unadjusted 16-bit ones
complement checksum of the
entire packet (excluding VLAN
header)
Same as above
Same as above
The unadjusted 1’s complement
checksum of the IP payload
Same as above
for supported packet formats.
Packet Checksum
Reserved
Incoming IP
Identification
Reserved
Incoming IP
Identification
Incoming IP
Identification
Identification
IP
UDPV/IPIDV
0b/0b
0b/1b
0b/0b
0b/1b
1b if the UDP
header
checksum is
valid/1b
0b/0b
0b/0b
Depend on transport
header and TUOFL
field
1b/0b
1b/0b
UDPCS/TCPCS
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