Figure 1. MDIO Register 1: SGMII Status Register
| Bits | Name | Description | Attributes | Default Value |
|---|---|---|---|---|
| 1.15 | 100BASE-T4 | Always returns a 0 for this bit because 100BASE-T4 is not supported | returns 0 | 0 |
| 1.14 | 100BASE-X Full Duplex | Always returns a 0 for this bit because 100BASE-X Full Duplex is not supported | returns 0 | 0 |
| 1.13 | 100BASE-X Half Duplex | Always returns a 0 for this bit because 100BASE-X Half Duplex is not supported | returns 0 | 0 |
| 1.12 | 10 Mb/s Full Duplex | Always returns a 0 for this bit because 10 Mb/s Full Duplex is not supported | returns 0 | 0 |
| 1.11 | 10 Mb/s Half Duplex | Always returns a 0 for this bit because 10 Mb/s Half Duplex is not supported | returns 0 | 0 |
| 1.10 | 100BASE-T2 Full Duplex | Always returns a 0 for this bit because 100BASE-T2 Full Duplex is not supported | returns 0 | 0 |
| 1.9 | 100BASE-T2 Half Duplex | Always returns a 0 for this bit because 100BASE-T2 Half Duplex is not supported | returns 0 | 0 |
| 1.8 | Extended Status | Always returns a 1 for this bit to indicate the presence of the Extended register (Register 15) | returns 1 | 1 |
| 1.7 | Unidirectional Ability | Always returns 1, writes ignored | returns 1 | 1 |
| 1.6 | MF Preamble Suppression | Always returns a 1 for this bit to indicate that Management Frame Preamble Suppression is supported | returns 1 | 1 |
| 1.5 | Auto- Negotiation Complete |
1 = Auto-Negotiation process completed across SGMII link 0 = Auto-Negotiation process not completed across SGMII link |
read only | 0 |
| 1.4 | Remote Fault |
1 = A fault on the Medium has been detected 0 = No fault of the Medium has been detected |
read only self clearing on read |
0 |
| 1.3 | Auto- Negotiation Ability | Always returns a 1 for this bit to indicate that the SGMII core is capable of Auto-Negotiation | returns 1 | 1 |
| 1.2 | SGMII Link Status |
1 = SGMII Link is up 0 = SGMII Link is down Latches 0 if the SGMII Link Status goes down. Clears to current SGMII Link Status on read. See the following section for further details. |
read only self clearing on read |
0 |
| 1.1 | Jabber Detect | Always returns a 0 for this bit because Jabber Detect is not supported | returns 0 | 0 |
| 1.0 | Extended Capability | Always returns a 0 for this bit because no extended register set is supported | returns 0 | 0 |