Figure 1. MDIO Register 5: SGMII Auto-Negotiation Link Partner Ability
The Auto-Negotiation Ability Base register (Register 5) contains information related to the status of the link between the PHY and its physical link partner across the Medium.
| Bits | Name | Description | Attributes | Default Value |
|---|---|---|---|---|
| 5.15 | PHY Link Status |
This refers to the link status of the PHY with its link partner across the Medium. 1 = Link Up 0 = Link Down |
read only | 1 |
| 5.14 | Acknowledge | Used by Auto-Negotiation function to indicate reception of a link partner base or next page | read only | 0 |
| 5.13 | Reserved | Always returns 0, writes ignored | returns 0 | 0 |
| 5.12 | Duplex Mode |
1= Full Duplex 0 = Half Duplex |
read only | 0 |
| 5.11:10 | Speed |
11 = Reserved 10 = 1 Gb/s 01 = 100 Mb/s 00 = 10 Mb/s |
read only | 00 |
| 5.9:1 | Reserved | Always return 0s | returns 0s | 000000000 |
| 5.0 | Reserved | Always returns 1 | returns 1 | 1 |