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MDIO Registers

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4.3PHY Acknowledge Status Register (ALIVE)

The PHY acknowledge status register (ALIVE) is shown in Figure 27 and described in Table 25.

ALIVE

R/W1C-0

LEGEND: R/W = Read/Write; W1C = Write 1 to clear (writing a 0 has no effect); -n= value after reset

Bit	Field	Value	Description

31-0	ALIVE		MDIO Alive bits. Each of the 32 bits of this register is set if the most recent access to the PHY with
			address corresponding to the register bit number was acknowledged by the PHY; the bit is reset if the
			PHY fails to acknowledge the access. Both the user and polling accesses to a PHY will cause the
			corresponding alive bit to be updated. The alive bits are only meant to be used to give an indication of the
			presence or not of a PHY with the corresponding address. Writing a 1 to any bit will clear it, writing a 0
			has no effect.
		0	The PHY fails to acknowledge the access.
		1	The most recent access to the PHY with an address corresponding to the register bit number was
			acknowledged by the PHY.

The PHY link status register (LINK) is shown in Figure 28 and described in Table 26.

LINK

R-0

LEGEND: R = Read only; -n= value after reset

			Table 26. PHY Link Status Register (LINK) Field Descriptions

Bit	Field	Value	Description

31-0	LINK		MDIO Link state bits. This register is updated after a read of the generic status register of a PHY. The bit
			is set if the PHY with the corresponding address has link and the PHY acknowledges the read
			transaction. The bit is reset if the PHY indicates it does not have link or fails to acknowledge the read
			transaction. Writes to the register have no effect.
		0	The PHY indicates it does not have a link or fails to acknowledge the read transaction
		1	The PHY with the corresponding address has a link and the PHY acknowledges the read transaction.

72	EMAC/MDIO Module	SPRUFL5B –April 2011
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