AR8327-AL1A-R datasheet(162/394 Pages) ETC2

162 / 394 page

162 • AR8327/AR8327N Seven-port Gigabit Ethernet Switch

Atheros Communications, Inc.

162 • June 2011

COMPANY CONFIDENTIAL

Table 3-141.

Port 4 Learn Limit Control Register

3.6.36

PORT5_LOOKUP_CTRL

Address 0x069C

SFT&HW RST

Table 3-142 summarizes the PORT5_LOOKUP_CTRL Register

Bit

R/W

Inital

Value

Mnemonic

Description

31:28

R/O

RESERVED

R/W

IGMP_LEARN_LIMIT_EN_4

1'b1: IGMP Learn Limit enable.

R/W

IGMP_LEARN_LIMIT_DROP_EN

1'b1: if IGMP GROUP ADDR is not in

ARL table or IGMP GROUP ADDR in

ARL but port member is not the source

port, packet should be dropped when

Learned MAC address counter is equal

to IGMP_JOIN_CNT_4

1'b0: if IGMP GROUP ADDR is not in

ARL table or IGMP GROUP ADDR in

ARL but port member is not the source

port, packet should be redirect to cpu

when Learned MAC address counter

is equal to IGMP_JOIN_CNT_4

25:16

R/W

IGMP_JOIN_CNT_4

Hardware join IGMP. When joiing new

entry or new port to IGMP +1, leave or

AGE -1.

15:12

R/W

SA_LEARN_STATUS_4

If less than 0x7, dynamic can be

refreshed to setting value and age

R/W

SA_LEARN_LIMIT_EN_4

1'b1: SA Learn Limit enable.

R/W

SA_LEARN_LIMIT_DROP_EN_4

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_4

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_4

9:0

R/W

SA_LEARN_CNT_4

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

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