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Intel PCI User Manual

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Software Developer’s Manual
Ethernet Interface
Table 8-7. GMII/MII Mode – Auto-Speed Detection
CTRL.FRCSPD = CTRL.FRCDPLX = 0b; CTRL.ASDE = 1b
Table 8-8. GMII/MII Mode – Force Speed
CTRL.FRCSPD = 1b; CTRL.FRCDPLX = 0b; CTRL.ASDE = X
Control Bit
Effect on Control Bits
CTRL.FD
Duplex is set per internal duplex indication after link up assertion by PHY.
CTRL.SLU
Software should set to allow PHY to control.
CTRL.RFCE
Must be set by software after reading flow control resolution from MII 
registers.
CTRL.TFCE
Must be set by software after reading flow control resolution from MII 
registers.
CTRL.SPEED
Ignored; no impact on speed.
STATUS.FD
Reflects the value of CTRL.FD as above.
STATUS.LU
Reflects internal link status
STATUS.SPEED
Speed status bits reflect speed resolved from ASD function.
Control Bit
Effect on Control Bits
CTRL.FD 
Duplex is set per internal duplex indicates input after link up assertion by PHY.
CTRL.SLU
Software should set to allow PHY to control.
CTRL.RFCE
Must be set by software after reading flow control resolution from MII 
registers.
CTRL.TFCE
Must be set by software after reading flow control resolution from MII 
registers.
CTRL.SPEED
Set by software to set speed of the MAC; must match PHY speed settings.
STATUS.FD
Reflects the value of CTRL.FD.
STATUS.LU
Reflects internal link status.
STATUS.SPEED
Speed status bits reflect speed forced by CTRL.SPEED.