Phy Acknowledge Status Register (Alive); Phy Link Status Register (Link); Phy Acknowledge Status Register (Alive) Field Descriptions; Phy Link Status Register (Link) Field Descriptions - Texas Instruments TMS320C674X User Manual

MDIO Registers
4.3

PHY Acknowledge Status Register (ALIVE)

The PHY acknowledge status register (ALIVE) is shown in
31
LEGEND: R/W = Read/Write; W1C = Write 1 to clear (writing a 0 has no effect); -n = value after reset
Table 25. PHY Acknowledge Status Register (ALIVE) Field Descriptions
Bit Field Value
31-0 ALIVE
0
1
4.4

PHY Link Status Register (LINK)

The PHY link status register (LINK) is shown in
31
LEGEND: R = Read only; -n = value after reset
Bit Field Value
31-0 LINK
0
1
72
EMAC/MDIO Module
Figure 27. PHY Acknowledge Status Register (ALIVE)
Description
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.
The PHY fails to acknowledge the access.
The most recent access to the PHY with an address corresponding to the register bit number was
acknowledged by the PHY.
Figure 28. PHY Link Status Register (LINK)
Table 26. PHY Link Status Register (LINK) Field Descriptions
Description
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.
The PHY indicates it does not have a link or fails to acknowledge the read transaction
The PHY with the corresponding address has a link and the PHY acknowledges the read transaction.
© 2011, Texas Instruments Incorporated
Figure 27 and described in
ALIVE
R/W1C-0
Figure 28 and described in
LINK
R-0
www.ti.com
Table 25.
Table 26.
SPRUFL5B – April 2011
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