SMSC LAN9312 - Manual (Page 306)

High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
Revision 1.4 (08-19-08) 306 SMSC LAN9312
DATASHEET
14.4.2.13 Port x PHY Special Control/Status Register (PHY_SPECIAL_CONTROL_STATUS_x)
This read/write register is used to control and monitor various options of the Port x PHY.
Index (decimal): 31 Size: 16 bits
BITS DESCRIPTION TYPE DEFAULT
15:13 RESERVED RO -
12 Autodone
This bit indicates the status of the Auto-Negotiation on the Port x PHY.
0: Auto-Negotiation is not completed, is disabled, or is not active
1: Auto-Negotiation is completed
RO 0b
11:5 RESERVED - Write as 0000010b, ignore on read R/W 0000010b
4:2 Speed Indication
This field indicates the current Port x PHY speed configuration. RO 000b
1:0 RESERVED R/W 0b
STATE DESCRIPTION
000 RESERVED
001 10BASE-T Half-duplex
010 100BASE-TX Half-duplex
011 RESERVED
100 RESERVED
101 10BASE-T Full-duplex
110 100BASE-TX Full-duplex
111 RESERVED