Bits | Name | Description | Attributes | Default Value |
---|---|---|---|---|
1.15 | 100BASE-T4 | Always returns a 0 because 100BASE-T4 is not supported. | Returns 0 | 0 |
1.14 | 100BASE-X Full Duplex | Always returns because 0 as 100BASE-X full duplex is not supported. | Returns 0 | 0 |
1.13 | 100BASE-X Half Duplex | Always returns a 0 because 100BASE-X half duplex is not supported. | Returns 0 | 0 |
1.12 | 10 Mbps Full Duplex | Always returns a 0 because 10 Mbps full duplex is not supported. | Returns 0 | 0 |
1.11 | 10 Mbps Half Duplex | Always returns a 0 because 10 Mbps half duplex is not supported | Returns 0 | 0 |
1.10 | 100BASE-T2 Full Duplex | Always returns a 0 because 100BASE-T2 full duplex is not supported. | Returns 0 | 0 |
1.9 | 100BASE-T2 Half Duplex | Always returns a 0 because 100BASE-T2 Half Duplex is not supported. | Returns 0 | 0 |
1.8 | Extended Status | Always returns a 1 to indicate the presence of the Extended register (Register 15). | Returns 1 | 1 |
1.7 | Unidirectional Ability | Always returns a 1, writes ignored | Returns 1 | 1 |
1.6 | MF Preamble Suppression | Always returns a 1 to indicate that Management Frame Preamble Suppression is supported. | Returns 1 | 1 |
1.5 | Auto- Negotiation Complete |
Using optional auto-negotiation: 1 = Auto-Negotiation process completed 0 = Auto-Negotiation process not completed Without optional auto-negotiation: Ignore this bit. |
RO | 0 |
1.4 | Remote Fault |
Using optional auto-negotiation: 1 = Remote fault condition detected 0 = No remote fault condition detected Without optional auto-negotiation: Always returns a 0. |
RO Self clearing on read |
0 |
1.3 | Auto- Negotiation Ability |
Using optional auto-negotiation: Always returns a 1 for this bit to indicate that the PHY is capable of Auto-Negotiation. Without optional auto-negotiation: Ignore this bit. |
Returns 1 | 1 |
1.2 | Link Status |
1 = Link is up 0 = Link is down (or has been down) Latches 0 if Link Status goes down. Clears to current Link Status on read. See Link Status for further details. |
RO | 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 |
Figure 1. MDIO Register 1: Status Register