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Intel
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82575EB Gigabit Ethernet Controller — PCIe* Message Format for DCA (MWr Mode)
Intel
®
82575EB Gigabit Ethernet Controller 324632-003
Software Developer’s Manual and EEPROM Guide Revision: 2.1
240 January 2011
Figure 25. PCIe* Message Format for DCA
The DCA preferences field has the following formats data movement engine 1 systems:
For data movement engine 2 systems:
Note: All functions within the 82575 have to adhere to the tag encoding rules for DCA writes.
Even if a given function is not capable of DCA, but other functions are capable of DCA,
memory writes from the non-DCA function must set the tag field to 00000b.
§ §
Bits Name Description
0 DCA Indication 0b = DCA disabled.
1b = DCA enabled.
1 DCA Target ID The DCA Target ID specifies the target cache for the data.
Bits Name Description
7:0 DCA Target ID 0000,0000b: DCA is disabled
Other: Target Core Id derived from APIC ID
Note: The 82575 supports programming of only five bits of the
eight possible. In the 82575 A0, the disable tag is 11111b.