IP1726LF-DS-R01 datasheet(22/33 Pages) ETC2

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IP1726 LF

Preliminary Data Sheet

22/33

Jun 15, 2005

IP1726 LF-DS-R06

Address

Attribute

Default

value

2FH

bit[0] : Hash algorithm selection

0 : CRC mapping

1 : Direct mapping

bit[1] : Address table aging function disable

0 : aging function enabled

1 : aging function disabled

bit[3:2] : Trunk ID hash algorithm selection

2'b00 : Port ID(the least significant 2 bits of the result of

port ID +1);

Note: The port ID is counted from 1 to 26.

2'b01 : SA(the least significant 2 bits of the source MAC

address)

2'b10 : DA(address bit 16 is mapped to trunk ID[1] and

address bit 0 is mapped to trunk ID[0] );

2'b11 : SA XOR DA(the result of the XOR operation

described above)

bit[4] : Broadcast Strom Control enable

0 : broadcast storm control disabled

1 : broadcast storm control enabled

bit[5] : Auto turn on/off flow control when priority queue enable

0 : normal flow control

1 : auto turn on/off flow control

bit[6] : Broadcast frames egress is blocked for port 25

0 : Broadcast frames send to p25

1 : Broadcast frames do not send to p25

bit[7] : Broadcast frames egress is blocked for port 26

R/W

8’h0

30H

bit[7:0] : Aging timer

The aging time is about : (aging_timer + 1) x 30.7 +-6.7% sec.

bit[14:8] : Broadcast storm control threshold

The broadcast frame number allow in one time unit

The time period is 1ms for 100M speed.

The time period is 10ms for 10M speed.

R/W

8’d9

8h’7f

31H

Enable Source MAC address learning function for port16~1

bit[15:0] : 0: disable learning

1: enable learning

R/W

16’hffff

32H

Enable Source MAC address learning function for port26~17

bit[8:0] : 0: disable learning

1: enable learning

R/W

10’h3ff

33H

Security configuration

bit[0] : Drop the unknown SA frame going to port 26 (CPU)

0 : forward

1 : Drop

bit[1] : forward unknown Source MAC address frame when the

address learning function is disabled

0 : drop the unknown SA frame

1 : forward the unknown SA frame

R/W

2’b10

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