MAC Mode of Operation
Figure 1. MDIO Register 4: SGMII Auto-Negotiation Advertisement
| Bits | Name | Description | Attributes | Default Value |
|---|---|---|---|---|
| 4.15:0 | All bits |
SGMII defined value sent from the MAC to the PHY. |
read/write | 0100000000000001 |
Figure 2. MDIO Register 4: SGMII Auto-Negotiation Advertisement
| Bits | Name | Description | Attributes | Default Value |
|---|---|---|---|---|
| 4.15 | 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/write | 0 |
| 4.14 | Acknowledge | Used by Auto-Negotiation function to indicate reception of a link partner base or next page. | read/write | 0 |
| 4.13 | Reserved | Always returns 0, writes ignored | returns 0 | 0 |
| 4.12 | Duplex Mode |
1= Full Duplex 0 = Half Duplex |
read/write | 0 |
| 4.11:10 | Speed |
11 = Reserved 10 = 1 Gb/s 01 = 100 Mb/s 00 = 10 Mb/s |
read/write | 00 |
| 4.9:1 | Reserved | Always return 0s | returns 0s | 000000000 |
| 4.0 | Reserved | Always returns 1 | returns 1 | 1 |