Appendix B: Auto Negotiation
Summary of MII Registers and Bit Definitions
SmartBits System Reference
205
Table C-3. Bit Definitions for MII Register 0 (Control)
Bit
Name
Description
15
PHY Reset
1 = PHY reset
0 = Normal operation
14
Enable Loopback
1 = Enable loopback mode
0 = Disable loopback mode
13
Speed Selection
Bit 6
Bit 13
Meaning
1
1
Reserved
1
0
1000Mbps
0
1
100Mbps
0
0
10Mbps
12
Auto Negotiation Enable
1 = Enable AN
0 = Disable AN
11
Power Down
1 = Power down
0 = Normal operation
10
Isolate
1 = Electrically isolate PHY from MII or GMII
0 = Normal operation
9
Restart Auto Negotiation
1 = Restart AN
0 = Normal operation
8
Duplex mode
1 = Full duplex
0 = Half duplex
7
Collision Test
1 = Enable COL signal test
0 = Disable COL signal test
6
Speed selection
Bit 6
Bit 13
Meaning
1
1
Reserved
1
0
1000Mbps
0
1
100Mbps
0
0
10Mbps
5-0
Reserved
Write as 0, ignore on Read
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