Figure 1. MDIO Register 4: Auto-Negotiation Advertisement
This register can also be programmed using the optional auto-negotiation configuration interface.
| Bits | Name | Description | Attributes | Default Value |
|---|---|---|---|---|
| 4.15 | Next Page | Core does not support Next Page. It can be enabled, if requested. Writes ignored. | R/W | 0 |
| 4.14 | Reserved | Always returns 0, writes ignored | Returns 0 | 0 |
| 4.13:12 | Remote Fault |
00 = No Error 01 = Offline 10 = Link Failure 11 = Auto-Negotiation Error |
R/W Self clearing to 00 after Auto-Negotiation |
00 |
| 4.11:9 | Reserved | Always return 0s, writes ignored | Returns 0 | 0 |
| 4.8:7 | Pause |
00 = No PAUSE 01 = Symmetric PAUSE 10 = Asymmetric PAUSE towards link partner 11 = Both Symmetric PAUSE and Asymmetric PAUSE towards link partner |
R/W | 11 |
| 4.6 | Half Duplex | Always returns a 0 for this bit because Half Duplex Mode is not supported | Returns 0 | 0 |
| 4.5 | Full Duplex |
1 = Full Duplex Mode is advertised 0 = Full Duplex Mode is not advertised 1 |
R/W | 1 |
| 4.4:0 | Reserved | Always return 0s, writes ignored | Returns 0s | 00000 |
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