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Common Firmware Pointer — Intel
®
82575EB Gigabit Ethernet Controller
324632-003 Intel
®
82575EB Gigabit Ethernet Controller
Revision: 2.1 Software Developer’s Manual and EEPROM Guide
January 2011 87
4.6.4.5 Tx Mode Control2 (RT_CTRL[31:16]) (Offset 04h)
4.6.4.6 MAC Tx Control Reg1 (TxCntrlReg1 (15:0]) (Offset
05h)
4.6.4.7 MAC Tx Control Reg2 (TxCntrlReg1 (31:16]) (Offset
06h)
4.6.5 Common Firmware Pointer
Word 54h is used to point to firmware structures common to pass through, and non-manageability
modes.
1 Clear Tx Error 0b Should be set when Tx path is stuck because of an
underflow condition Cleared by hardware when release
is done.
0 Enable Tx Pads 0b When set, the NC-SI Tx pads are driving, else they are
isolated.
Bit Name
HDW Default
00h
Description
15:0 Reserved 00h Should be 0b.
Bit Name
HDW Default
18h
Description
15:7 Reserved 0 Should be 0b.
6 NC-SI_en 0b Enable the MAC internal NC-SI mode of operation
(disables external NC-SI gasket).
5 Two_part_deferral 0b When set, perform the optional two part deferral.
4 Append_fcs 1b When set, compute and append FCS on TX frames.
3 Pad_enable 1b Pad the TX frames, which are less than the minimum
frame size.
2 Rtry_col 0b Retry frames on collision until the max retry limit is
reached. Note that this bit has no effect when working
in full duplex.
1 Half Duplex 1b Half-duplex mode of operation, when set. Else Full
duplex is assumed.
0 Reserved 0b Reserved
Bit Name
HDW Default
00h
Description
15:0 Reserved 00h Should be 0b.