AR8327-AL1A-R datasheet(158/394 Pages) ETC2

158 / 394 page

158 • AR8327/AR8327N Seven-port Gigabit Ethernet Switch

Atheros Communications, Inc.

158 • June 2011

COMPANY CONFIDENTIAL

3.6.33

PORT4_LOOKUP_CTRL

Address 0x0690

SFT&HW RST

Table 3-139 summarizes the PORT4_LOOKUP_CTRL Register

Table 3-139.

Port 4 Lookup Control Register

R/W

SA_LEARN_LIMIT_DROP_EN_3

1'b1: if SA is not in ARL table or SA in

ARL but port member is not the source

port, packet should be dropped when

Learned MAC address counter is equal

to SA_LEARN_CNT_3

1'b0: if SA is not in ARL table or SA in

ARL but port member is not the source

port, packet should be redirect to cpu

when Learned MAC address counter

is equal to SA_LEARN_CNT_3

9:0

R/W

SA_LEARN_CNT_3

The MAC address can be learned and

written to the ARL table — only

dynamic entry is counted

0: indicates no MAC limit number is 1

1: indicates the MAC limit number is 2

2: indicates the MAC limit number is 3

... and so on ... until:

1023: indicates the MAC limit is 1024

Bit

R/W

Inital

Value

Mnemonic

Description

Bit

R/W

Inital

Value

Mnemonic

Description

R/W

MULTICAST_DROP

_EN_4

1'b1: Drop the multicast Packet from this port. Don't

drop IGMP/MLD join/leave and Special DIP

packet.

30:29

R/O

RESERVED

R/W

UNI_LEAKY_EN_4

unicast frame leaky VLAN enable.

Also use ARL_UNI_LEAKY_EN and LEAKY_EN

bit in ARL table to control unicast leaky VLAN.

When ARL_UNI_LEAKY_EN is set to zero, only

UNI_LEAKE_EN control unicast frame leaky

VLAN.

If ARL_UNI_LEAKY_EN is set to 1'b1, only frame

with DA in ARL table and LEAKY_EN bit is set to

1'b1 can be forward as leaky VLAN, ignore

UNI_LEAKY_EN.

if mac receive unicast frame from this port which

should forward as leaky VLAN, the frame could be

switched to destination port defined in ARL table

and cross all VLAN ( include port base and 802.1q ).

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