High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX
Datasheet
5.5
PHY Registers
The PHY registers are not memory mapped. These registers are accessed indirectly through the MAC
via the MII_ACC and MII_DATA registers. An index must be used to access individual PHY registers.
PHY Register Indexes are shown in Table 5.8, "LAN9218 PHY Control and Status Register".
Note: The NASR (Not Affected by Software Reset) designation is only applicable when bit 15 of
the PHY Basic Control Register (Reset) is set.
Table 5.8 LAN9218 PHY Control and Status Register
PHY CONTROL AND STATUS REGISTERS
INDEX
(IN DECIMAL)
REGISTER NAME
0
1
Basic Control Register
Basic Status Register
2
PHY Identifier 1
3
PHY Identifier 2
4
Auto-Negotiation Advertisement Register
Auto-Negotiation Link Partner Ability Register
Auto-Negotiation Expansion Register
Mode Control/Status Register
Special Modes Register
5
6
17
18
27
29
30
31
Special Control/Status Indications
Interrupt Source Register
Interrupt Mask Register
PHY Special Control/Status Register
SMSC LAN9218
103
Revision 1.5 (07-18-06)
DATASHEET
SMSC [ SMSC CORPORATION ]
