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
9
100BASE-T2 Half
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 = Link is up
0 = Link is down
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