LAN9311 Datasheet, PDF (389/461 Pages) SMSC Corporation – Two Port 10/100 Managed Ethernet Switch with 16-Bit Non-PCI CPU Interface

Two Port 10/100 Managed Ethernet Switch with 16-Bit Non-PCI CPU Interface
Datasheet
14.5.3.19 Switch Engine Port State Register (SWE_PORT_STATE)
Register #:
1843h
Size:
32 bits
This register is used to configure the per port spanning tree state.
BITS
DESCRIPTION
31:6 RESERVED
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
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
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.
TYPE
RO
R/W
R/W
R/W
DEFAULT
-
00b
00b
00b
SMSC LAN9311/LAN9311i
389
DATASHEET
Revision 2.0 (02-14-13)