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Intel
®
82575EB Gigabit Ethernet Controller — MAC/SerDes Link Setup (CTRL_EXT.LINK_MODE =
11b)
Intel
®
82575EB Gigabit Ethernet Controller 324632-003
Software Developer’s Manual and EEPROM Guide Revision: 2.1
34 January 2011
STATUS.FD - Reflects the MAC duplex setting written by software to CTRL.FD
STATUS.LU - Reflects 1b. (positive link indication LINK from PHY qualified with CTRL.SLU).
Note: Since both CTRL.SLU and the PHY link indication LINK are forced, this bit set does not
guarantee that operation of the link has been truly established.
STATUS.SPEED - Reflects MAC forced speed setting written in CTRL.SPEED.
3.7.3 MAC/SerDes Link Setup (CTRL_EXT.LINK_MODE
= 11b)
Link setup procedures using an external SerDes interface mode:
• Hardware Auto-Negotiation Enabled (PCS_LCTL.AN_ENABLE = 1b)
CTRL.FD - Ignored; duplex is set by priority resolution of PCS_ANDV and PCS_LPAB.
CTRL.SLU - Ignored; it is not possible to “force” link configuration (AN_ENABLE takes precedence)
CTRL.RFCE - Must be set by software after reading flow control resolution from PCS registers
CTRL.TFCE - Must be set by software after reading flow control resolution from PCS registers
CTRL.SPEED - Ignored; speed always 1000 Mb/s when using SGMII mode communications
STATUS.FD - Reflects hardware-negotiated priority resolution
STATUS.LU - Reflects PCS_LSTS.AN COMPLETE (Auto-Negotiation complete)
STATUS.SPEED - Reflects 1000 Mb/s speed, reporting fixed value of 10b
PCS_LCTL.FORCE_LINK - Ignored; it is not possible to "force" link configuration (AN_ENABLE takes
precedence)
PCS_LCTL.FSD - Ignored; it is not possible to "force" link configuration (AN_ENABLE takes precedence)
PCS_LCTL.FSV - Ignored; speed always 1000Mb/s when using SerDes mode communications
PCS_LCTL.FDV - Ignored; duplex is set by priority resolution of PCS_ANDV and PCS_LPAB
PCS_LCTL.FLV - Ignored; it is not possible to "force" link configuration (AN_ENABLE takes precedence)
• Software-Executed Auto-Negotiation Enabled (PCS_LCTL.AN_ENABLE = 0b)
CTRL.FD - Should be set by software to the duplex value established via software priority resolution
CTRL.SLU - Should be set by software to 1b when software Auto-Negotiation completes
CTRL.RFCE - Set by software as a result of software priority resolution
CTRL.TFCE - Set by software as a result of software priority resolution
CTRL.SPEED - Ignored; speed always 1000 Mb/s when using SerDes mode communications