SMSC LAN9312 - Manual (Page 385)

High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
SMSC LAN9312 385 Revision 1.4 (08-19-08)
DATASHEET
14.5.3.17 Switch Engine Port Ingress Configuration Register (SWE_PORT_INGRSS_CFG)
This register is used to configure the per port ingress rules.
Register #: 1841h Size: 32 bits
BITS DESCRIPTION TYPE DEFAULT
31:6 RESERVED RO -
5:3 Enable Learning on Ingress
When set, source addresses are learned when a packet is received on the
corresponding port and the corresponding Port State in the
Switch Engine
Port State Register (SWE_PORT_STATE) is set to forwarding or learning.
There is one enable bit per ingress port. Bits 5,4,3 correspond to switch
ports 2,1,0 respectively.
R/W 111b
2:0 Enable Membership Checking
When set, VLAN membership is checked when a packet is received on the
corresponding port.
The packet will be filtered if the ingress port is not a member of the VLAN
(unless the Admit Non Member bit is set for the port in the
Switch Engine
Admit Non Member Register (SWE_ADMT_N_MEMBER) )
For destination addresses that are found in the ALR table, the packet will be
filtered if the egress port is not a member of the VLAN (for destination
addresses that are not found in the ALR table only the ingress port is
checked for membership).
The VLAN Enable bit in the Switch Engine Global Ingress Configuration
Register (SWE_GLOBAL_INGRSS_CFG) needs to be set for these bits to
have an affect.
There is one enable bit per ingress port. Bits 2,1,0 correspond to switch
ports 2,1,0 respectively.
R/W 000b