LAN9312 datasheet(386/458 Pages) SMSC

386 / 458 page

High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface

Datasheet

Revision 1.2 (04-08-08)

386

SMSC LAN9312

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.

1841h

Size:

32 bits

BITS

DESCRIPTION

TYPE

DEFAULT

31:6

RESERVED

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

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

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