Appendix B: Auto Negotiation
Summary of MII Registers and Bit Definitions
204 SmartBits System Reference
Summary of MII Registers and Bit Definitions
Table 2 lists all the MII registers and their functions. Table 3 through Table 7 provide the
bit definitions for registers 0, 1, 4, 5, 9, and 10. Refer to the IEEE 802.3 specification for
more detailed information.
Table C-2. MII Registers
Register Address Register Name
0Control
1 Status
2, 3 PHY Identifier
4 Auto Negotiation Advertisement
5 Auto Negotiation Link Partner Base Page Ability
6 Auto Negotiation Expansion
7 Auto Negotiation Next Page Transmit
8 Auto Negotiation Link Partner Received Next Page
9 1000BASE-T2 Control Register
10 1000BASE-T2 Status Register
11-14 Reserved
15 Extended Status
16 Vendor Specific
17-31 Reserved
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