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Software Developer’s Manual 379
General Initialization and Reset Operation
14.5.5 Link Setup
The following examples are provided as suggestions for configuring common settings between the
MAC and an Ethernet controller attached in the GMII/MII mode.
• MAC duplex and speed settings forced by software based on resolution of PHY
(CTRL.FRCDPLX = 1b, CTRL.FRCSPD = 1b, CTRL.ASDE = don’t care)
CTRL.FD Set by software based on reading PHY status register after
PHY has autonegotiated 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 S/W after reading flow control resolution from
PHY registers
CTRL.TFCE - Must be set by S/W after reading flow control resolution from PHY registers
CTRL.SPEED Set by software based on reading PHY status register after
PHY has autonegotiated 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 duplex setting forced by software based on resolution of PHY; speed auto-detected by
MAC
(CTRL.FRCDPLX = 1b, CTRL.FRCSPD = 0b, CTRL.ASDE = 1b)
CTRL.FD Set by software based on reading PHY status register after
PHY has autonegotiated 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 S/W after reading flow control resolution from
PHY registers
CTRL.TFCE .............. Must be set by S/W after reading flow control resolution from PHY
registers
CTRL.SPEED Don’t care; speed setting is calculated by the MAC based
on signals from the PHY after PHY has autonegotiated 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 actual speed setting calculated by MAC ASD
function