SMSC LAN9420i Manual De Usuario

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Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface
Datasheet
Revision 1.22 (09-25-08)
148
SMSC LAN9420/LAN9420i
DATASHEET
4.5.13
PHY Special Control/Status
Note 4.6
Bit 6 of this register must be set to ‘1’ for write operations. 
Index (In Decimal):
31
Size:
16 bits
BITS
DESCRIPTION
TYPE
DEFAULT
15:13
RESERVED
RO
-
12
Autodone
Auto-negotiation done indication:
0 = Auto-negotiation is not done or disabled (or not active)
1 = Auto-negotiation is done
RO
0
11:5
RESERVED 
Write as 0000010b, ignore on read.
-
4:2
Speed Indication
HCDSPEED value:
[001b] = 10Mbps half-duplex
[101b] = 10Mbps full-duplex
[010b] = 100BASE-TX half-duplex
[110b] = 100BASE-TX full-duplex
RO
000b
1:0
RESERVED
RO
-