LAN9312 datasheet(384/458 Pages) SMSC

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

Datasheet

Revision 1.2 (04-08-08)

384

SMSC LAN9312

DATASHEET

14.5.3.16

Switch Engine Global Ingress Configuration Register (SWE_GLOBAL_INGRSS_CFG)

This register is used to configure the global ingress rules.

1840h

Size:

32 bits

BITS

DESCRIPTION

TYPE

DEFAULT

31:14

RESERVED

Allow Snoop Echo

When set, snooped packets are allowed to be echoed back to the source

port. When cleared, snooped packets, like other packets, are never sent

back to the source port.

This bit is useful when the snoop port wishes to receive it’s own MLD/IGMP

packets.

R/W

12:10

MLD/IGMP Snoop Port

This field is the port bit map where IPv6 MLD packets and IPv4 IGMP

packets are sent.

R/W

Use IP

When set, the IPv4 TOS or IPv6 SC field is enabled as a transmit priority

queue choice.

R/W

Enable MLD Snooping

When set, IPv6 Multicast Listening Discovery packets are snooped and sent

to the MLD/IGMP snoop port.

R/W

Enable IGMP Snooping

When set, IPv4 IGMP packets are snooped and sent to the MLD/IGMP

snoop port.

R/W

SWE Counter Test

When this bit is set the Switch Engine counters that normally clear to 0 when

read will be set to 7FFF_FFFCh when read.

R/W

DA Highest Priority

When this bit is set and the Static bit in the ALR table for the destination

MAC address is set, the transmit priority queue that is selected is taken from

the ALR Priority bits (see the Switch Engine ALR Read Data 1 Register

(SWE_ALR_RD_DAT_1)).

R/W

Filter Multicast

When this bit is set, packets with a multicast destination address are filtered

if the address is not found in the ALR table. Broadcasts are not included in

this filter.

R/W

Drop Unknown

When this bit is set, packets with a unicast destination address are filtered

if the address is not found in the ALR table.

R/W

Use Precedence

When the priority is taken from an IPV4 packet (enabled via the Use IP bit),

this bit selects between precedence bits in the TOS octet or the DIFFSERV

table.

When set, IPv4 packets will use the precedence bits in the TOS octet to

select the transmit priority queue. When cleared, IPv4 packets will use the

DIFFSERV table to select the transmit priority queue.

R/W

LAN9312 Datasheet(PDF) 384 Page - SMSC Corporation

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