Texas Instruments TMS320C645x DSP manual PHY Acknowledge Status Register Alive

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MDIO Registers

4.4PHY Acknowledge Status Register (ALIVE)

The PHY acknowledge status register (ALIVE) is shown in Figure 18 and described in Table 17.

	Figure 18. PHY Acknowledge Status Register (ALIVE)
31	16
	ALIVE
	R/WC-0
15	0
	ALIVE

R/WC-0

LEGEND: R/W = Read/Write; R/WC = Read/Write 1 to clear; -n= value after reset

Table 17. PHY Acknowledge Status Register (ALIVE) Field Descriptions

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.

SPRU975B –August 2006	Ethernet Media Access Controller (EMAC)/Management Data Input/Output (MDIO)	69
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