WG82574L S LBA8 Intel, WG82574L S LBA8 Datasheet - Page 130

• 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

Note:
Note:
130
HLEN (bit 9:0): The HLEN field indicates the header length in byte count that was
analyzed by the 82574. The 82574 posts the first HLEN bytes of the incoming packet to
buffer zero of the Rx descriptor.
Packet types supported by the packet split: The 82574 provides header split for
the packet types listed in the following table. Other packet types are posted
sequentially in the buffers of the packet split receive buffers.
A header of a fragmented IPv6 packet is defined until the fragmented extension header.
If the device is not configured to provide any offload that requires packet parsing, the
packet type field is set to 0b regardless of the actual packet type. When packet split is
enabled, the packet type field is always valid.
0x0
0x1
0x2
0x3
0x4
0x5
0x6
0x7
0x8
0x9
0xA
0xB
0xC
0xD
0xE
Packet
Type
MAC, (VLAN/SNAP), payload
MAC, (VLAN/SNAP), IPv4, payload
MAC, (VLAN/SNAP), IPv4, TCP/UDP, payload
MAC (VLAN/SNAP), IPv4, IPv6, payload
MAC (VLAN/SNAP), IPv4, IPv6,TCP/UDP, payload
MAC (VLAN/SNAP), IPv6, payload
MAC (VLAN/SNAP), IPv6,TCP/UDP, payload
MAC, (VLAN/SNAP) IPv4, TCP, ISCSI, payload
MAC, (VLAN/SNAP) IPv4, TCP/UDP, NFS, payload
MAC (VLAN/SNAP), IPv4, IPv6, TCP, ISCSI, payload
MAC (VLAN/SNAP), IPv4, IPv6, TCP/UDP,NFS,
payload
MAC (VLAN/SNAP), IPv6, TCP, ISCSI, payload
MAC (VLAN/SNAP), IPv6, TCP/UDP, NFS, payload
Reserved
PTP packet (TimeSync according to Ethertype)
Description
No.
Split header after L3 if fragmented packets.
Split header after L4 if not fragmented,
otherwise treat as packet type 1.
Split header after L3 if either IPv4 or IPv6
indicates a fragmented packet.
Split header after L4 if IPv4 not fragmented
and if IPv6 does not include fragment
extension header, otherwise treat as packet
type 3.
Split header after L3 if fragmented packets.
Split header after L4 if IPv6 does not include
fragment extension header, otherwise treat
as packet type 5.
Split header after L5 if not fragmented,
otherwise treat as packet type 1.
Split header after L5 if not fragmented,
otherwise treat as packet type 1.
Split header after L5 if IPv4 not fragmented
and if IPv6 does not include fragment
extension header, otherwise treat as packet
type 3.
Split header after L5 if IPv4 not fragmented
and if IPv6 does not include fragment
extension header, otherwise treat as packet
type 3.
Split header after L5 if IPv6 does not include
fragment extension header, otherwise treat
as packet type 5.
Split header after L5 if IPv6 does not include
fragment extension header, otherwise treat
as packet type 5.
No.
82574 GbE Controller—Inline Functions
Header Split