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MAC/PHY Link Setup (CTRL_EXT.LINK_MODE = 00b) — Intel
®
82575EB Gigabit Ethernet
Controller
324632-003 Intel
®
82575EB Gigabit Ethernet Controller
Revision: 2.1 Software Developer’s Manual and EEPROM Guide
January 2011 33
CTRL.FD - Don't care; duplex setting is established from PHY's internal indication to the MAC (FDX)
after PHY has auto-negotiated a successful link-up
CTRL.SLU - Must be set to 1b by software to enable communications between MAC and PHY
CTRL.RFCE - Must be set by software after reading flow control resolution from PHY registers
CTRL.TFCE - Must be set by software after reading flow control resolution from PHY registers
CTRL.SPEED - Don't care; speed setting is established from PHY's internal indication to the MAC
(SPD_IND) after PHY has auto-negotiated a successful link-up
STATUS.FD - Reflects the actual duplex setting (FDX) negotiated by the PHY and indicated to MAC
STATUS.LU - Reflects link indication (LINK) from PHY qualified with CTRL.SLU (set to 1b)
STATUS.SPEED - Reflects actual speed setting negotiated by the PHY and indicated to the MAC
(SPD_IND)
• MAC duplex and speed settings forced by software based on resolution of PHY
(CTRL.FRCDPLX = 1b, CTRL.FRCSPD = 1b)
CTRL.FD - Set by software based on reading PHY status register after PHY has auto-negotiated a
successful link-up
CTRL.SLU - Must be set to 1b by software to enable communications between MAC and PHY
CTRL.RFCE - Must be set by software after reading flow control resolution from PHY registers
CTRL.TFCE - Must be set by software after reading flow control resolution from PHY registers
CTRL.SPEED - Set by software based on reading PHY status register after PHY has auto-negotiated a
successful link-up.
STATUS.FD - Reflects the MAC forced duplex setting written to CTRL.FD
STATUS.LU - Reflects link indication (LINK) from PHY qualified with CTRL.SLU (set to 1b)
STATUS.SPEED - Reflects MAC forced speed setting written in CTRL.SPEED
• MAC/PHY duplex and speed settings both forced by software (fully-forced link setup)
(CTRL.FRCDPLX = 1b, CTRL.FRCSPD = 1b, CTRL.SLU = 1b)
CTRL.FD - Set by software to desired full/half duplex operation (must match duplex setting of PHY)
CTRL.SLU - Must be set to 1b by software to enable communications between MAC and PHY. PHY must
also be forced/configured to indicate positive link indication (LINK) to the MAC
CTRL.RFCE - Must be set by software to desired flow-control operation (must match flow-control
settings of PHY)
CTRL.TFCE - Must be set by software to desired flow-control operation (must match flow-control
settings of PHY)
CTRL.SPEED - Set by software to desired link speed (must match speed setting of PHY)