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82575EB Gigabit Ethernet Controller — Advanced Transmit Data Descriptor
Intel
®
82575EB Gigabit Ethernet Controller 324632-003
Software Developer’s Manual and EEPROM Guide Revision: 2.1
142 January 2011
Table 42. Advanced Transmit Context Descriptor Required Valid Fields
5.6.8 Advanced Transmit Data Descriptor
Table 43 and Table 44 list the advanced transmit data descriptor read and write-back formats.
Table 43. Advanced Transmit Data Descriptor Read Format
Table 44. Advanced Transmit Data Descriptor Write-Back Format
5.6.8.1 Address
The physical address of a data buffer in host memory that contains a portion of a transmit packet.
5.6.8.2 DTALEN
The length (in bytes) of data buffer at the address pointed to by this specific descriptor.
5.6.8.3 DTYP
Always set to 0011b for this descriptor type.
Required Offload Valid Fields in Context
TSE TXSM IXSM VLAN L4LEN IPLEN MACLEN MSS MKRLOC
SN
MKRREQ
L4T IPV4
N/A 1b 1b VLE yes yes yes yes yes yes yes
1b 1b 1b VLE yes yes yes yes no yes yes
0b 1b X VLE no yes yes no no yes yes
0b 0b 1b VLE no yes yes no no no yes
0b 0b 0b VLE no no no no no no no
0 Address[63:0]
8 PAYLEN POPTS IDX STA DCMD DTYP RSV DTALEN
63 46 45 40 39 36 35 32 31 24 23
2
0
1
9
16 15 0
0 Reserved
8 Reserved STA NXTSEQ
63 36 35 32 31 0