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Intel
®
82575EB Gigabit Ethernet Controller — MAC/SGMII Link Setup (CTRL_EXT.LINK_MODE =
10b)
Intel
®
82575EB Gigabit Ethernet Controller 324632-003
Software Developer’s Manual and EEPROM Guide Revision: 2.1
36 January 2011
• Hardware Auto-Negotiation Enabled (PCS_LCTL. AN ENABLE = 1b,
CTRL.FRCDPLX = 0b, CTRL.FRCSPD = 0b)
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 - Don't care; speed setting is established from SGMII's internal indication to the MAC after
SGMII has auto-negotiated a successful link-up
STATUS.FD - Reflects hardware-negotiated priority resolution
STATUS.SPEED - Reflects actual speed setting negotiated by the SGMII and indicated to the MAC
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 is set by priority resolution of PCS_ANDV and PCS_LPAB
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.FRCDPLX = 1b,
CTRL.FRCSPD = 1b)
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 - Set by software to desired link speed (must match speed setting of external SGMII PHY)
STATUS.FD - Reflects MAC forced speed setting written in CTRL.SPEED
STATUS.LU - Reflects whether loss-of-signal (LOS) from SerDes is indicated, qualified with CTRL.SLU
(set to 1b)
STATUS.SPEED - Reflects MAC forced speed setting written in CTRL.SPEED
PCS_LCTL.FORCE_LINK - Must be set to 1b by software to enable communications to the SGMII PHY
PCS_LCTL.FSD - Must be set to 1b by software to enable communications to the SGMII PHY
PCS_LCTL.FSV - Set by software to desired link speed (must match speed setting of external SGMII
PHY)