Appendix B: Auto Negotiation
Summary of MII Registers and Bit Definitions
206 SmartBits System Reference
Table C-4. Bit Definitions for MII Register 1 (Status)
Bit Name Description
15 100BASE-T4 1 = PHY able to perform 100BASE-T4
0 = PHY not able to perform 100BASE-T4
14 100BASE-X Full Duplex 1 = PHY able to perform full duplex 100BASE-X
0 = PHY not able to perform full duplex 100BASE-X
13 100BASE-X Half Duplex 1 = PHY able to perform half duplex 100BASE-X
0 = PHY not able to perform half duplex 100BASE-X
12 10Mbps Full Duplex 1 = PHY able to perform full duplex 10 Mbps
0 = PHY not able to perform full duplex 10 Mbps
11 10Mbps Half Duplex 1 = PHY able to perform half duplex 10 Mbps
0 = PHY not able to perform half duplex 10 Mbps
10 100BASE-T2 Full
Duplex
1 = PHY able to perform full duplex 100BASE-T2
0 = PHY not able to perform full duplex 100BASE-T2
9100BASE-T2Half
Duplex
1 = PHY able to perform half duplex 100BASE-T2
0 = PHY not able to perform half duplex 100BASE-T2
8 Extended Status 1 = Extended status information in Register 15
0 = No extended status information in Register 15
7 Reserved Ignored when read.
6 MF Preamble
Suppression
1 = PHY will accept management frames with preamble
suppressed
0 = PHY will not accept management frames with
preamble suppressed
5 Auto Negotiation
Complete
1 = AN process completed
0 = AN process not completed
4 Remote Fault 1 = Remote fault condition detected
0 = No remote fault condition detected
3 Auto Negotiation Ability 1 = PHY is able to perform AN
0 = PHY is not able to perform AN
2 Link Status 2 = Will latch until register is read; records down
condition even if link comes back up until read.
1=Linkisup
0=Linkisdown
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