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Intel
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82575EB Gigabit Ethernet Controller — Header Splitting and Replication
Intel
®
82575EB Gigabit Ethernet Controller 324632-003
Software Developer’s Manual and EEPROM Guide Revision: 2.1
128 January 2011
The Header Buffer Address includes the address of the buffer that contains the header information. The
Receive DMA module stores the header portion of the received packets into this buffer.
The 82575 uses the Packet Replication or splitting feature when the SRRCTL[n].DESCTYPE is greater
than one. The software device driver must also program the buffer sizes in the SRRCTL[n] registers.
When Header split is selected, the packet is split only on selected types of packets. A bit exists for each
option in PSRTYPE[n] registers, so several options can be used in conjunction. If one or more bits are
set, the splitting is performed for the corresponding packet type.
Table 33 lists the behavior of the 82575 in the different modes.