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82575EB Gigabit Ethernet Controller — Tag IDs
Intel
®
82575EB Gigabit Ethernet Controller 324632-003
Software Developer’s Manual and EEPROM Guide Revision: 2.1
178 January 2011
Table 54 lists the tag IDs in read transactions.
Since DCA is implemented differently in data movement engine 1 and in data movement engine 2
platforms, the tag IDs are different as well.
DCA mode (data movement engine 1 and 2) is done by setting the DCA_Mode bit in the DCA Mode
register.
DCA itself is enabled or disabled by setting the DCA_Dis bit in the GCR register.
Table 55. Tag IDs in Write Transactions (Data Movement Engine 1)
Table 54. Assignment of Tag IDs
Tag ID Description
00h Reserved
01h Descriptor Rx
03h:02h Reserved
04h Descriptor Tx
07h:05h Reserved
08h Data Request 0
09h Data Request 1
0Ah Data Request 2
0Bh Data Request 3
10h Management
11h Message Unit
12h:1Fh Reserved
Tag ID Description DCA
00h Management Disabled
01h Descriptors, data, WB tail for CPU ID 0 Enabled
02h WB descriptor Tx / WB tail Disabled
03h Descriptors, data, WB tail for CPU ID 1 Enabled
04h WB descriptor Rx Disabled
05h Descriptors, data, WB tail for CPU ID 2 Enabled
06h Write data Disabled
07h Descriptors, data, WB tail for CPU ID 3 Enabled
08h Reserved -
09h Descriptors, data, WB tail for CPU ID 4 Enabled
0Ah Reserved Disabled
0Bh Descriptors, data, WB tail for CPU ID 5 Enabled
0Ch Reserved Disabled
0Dh Descriptors, data, WB tail for CPU ID 6 Enabled