SMSC LAN9312 - Manual (Page 387)

High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
SMSC LAN9312 387 Revision 1.4 (08-19-08)
DATASHEET
14.5.3.19 Switch Engine Port State Register (SWE_PORT_STATE)
This register is used to configure the per port spanning tree state.
Register #: 1843h Size: 32 bits
BITS DESCRIPTION TYPE DEFAULT
31:6 RESERVED RO -
5:4 Port State Port 2
These bits specify the spanning tree port states for Port 2.
00 = Forwarding
01 = Blocking
10 = Learning
11 = Listening
R/W 00b
3:2 Port State Port 1
These bits specify the spanning tree port states for Port 1.
00 = Forwarding
01 = Blocking
10 = Learning
11 = Listening
R/W 00b
1:0 Port State Port 0
These bits specify the spanning tree port states for Port 0(Host MAC).
00 = Forwarding
01 = Blocking
10 = Learning
11 = Listening
Note: Typically, the Host MAC is kept in the forwarding state, since it is
not a true network port.
R/W 00b