![](/images/new-backgrounds/1169447/169447113x1.webp)
www.ti.com
MDIO Registers
4.3PHY Acknowledge Status Register (ALIVE)
The PHY acknowledge status register (ALIVE) is shown in Figure 15 and described in Table 13.
| Figure 15. PHY Acknowledge Status Register (ALIVE) |
31 | 16 |
| ALIVE |
| |
15 | 0 |
| ALIVE |
LEGEND: R/W = Read/Write; WC = Write 1 to clear;
Table 13. PHY Acknowledge Status Register (ALIVE) Field Descriptions
Bit | Field | Value | Description |
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. |
1The most recent access to the PHY with an address corresponding to the register bit number was acknowledged by the PHY.
4.4PHY Link Status Register (LINK)
The PHY link status register (LINK) is shown in Figure 16 and described in Table 14.
| Figure 16. PHY Link Status Register (LINK) |
31 | 16 |
| LINK |
| |
15 | 0 |
LINK
LEGEND: R = Read only;
|
|
| Table 14. PHY Link Status Register (LINK) Field Descriptions |
Bit | Field | Value | Description |
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. |
SPRU941A
Submit Documentation Feedback | Management Data Input/Output (MDIO) |
|