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Transmit Descriptor Special Field Format — Intel
®
82575EB Gigabit Ethernet Controller
324632-003 Intel
®
82575EB Gigabit Ethernet Controller
Revision: 2.1 Software Developer’s Manual and EEPROM Guide
January 2011 139
5.6.5.4 Transmit Descriptor Status Field Format
Table 38. Transmit Status Layout
5.6.6 Transmit Descriptor Special Field Format
The Special field is used to provide the 802.1q/802.1ac tagging information and is qualified only on the
first descriptor of each packet when the VLE bit is set.
3 2 1 0
Reserved DD
TDESC.STATUS Description
RSV (bits 3:1) Reserved.
Should be programmed to 000b.
DD (bit 0) Descriptor Done
Indicates that the descriptor is finished and is written back either after the descriptor has been processed
(with RS set).