LAN9420 Datasheet, PDF (137/171 Pages) SMSC Corporation – Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface

Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface
Datasheet
4.5.1 Basic Control Register
Index (In Decimal): 0
Size:
16 bits
BITS
15
14
13
12
11
10
9
8
7
6:0
DESCRIPTION
TYPE
PHY Soft Reset
1 = PHY software reset. Bit is self-clearing. When setting this bit do not set
other bits in this register.
Loopback
1 = loopback mode, 0 = normal operation
Speed Select
1 = 100Mbps, 0 = 10Mbps. Ignored if Auto Negotiation is enabled (0.12 =
1).
Auto-Negotiation Enable
1 = enable auto-negotiate process (overrides 0.13 and 0.8) 0 = disable
auto-negotiate process.
Power Down
1 = General Power-Down mode, 0 = normal operation
Note: For maximum power savings, auto-negotiation should be disabled
before enabling the General Power-Down mode.
RESERVED
Restart Auto-Negotiate
1 = restart auto-negotiate process 0 = normal operation. Bit is self-clearing.
Duplex Mode
1 = full duplex, 0 = half duplex. Ignored if Auto Negotiation is enabled (0.12
= 1).
Collision Test
1 = enable COL test, 0 = disable COL test
RESERVED
R/W/SC
R/W
R/W
R/W
R/W
RO
R/W/SC
R/W
R/W
RO
DEFAULT
0b
0b
1b
1b
0b
-
0b
0b
0b
-
SMSC LAN9420/LAN9420i
137
DATASHEET
Revision 1.6 (07-18-11)