IP1718 LF
Preliminary Data Sheet
24/33
January 27, 2005
Copyright © 2003, IC Plus Corp.
IP1718 LF-DS-R05
Register
Address
Register Description
Attribute
Default
value
68H
Trunk group 0 (p4, p3, p2, p1) setting
port 1 ~ port 4 are the same trunk group and can be any
combination to form a trunk. The trunk ID described below is derived
by the algorithm defined in register 2FH.
bit[3:0] : trunk configuration for port 01
4'b0000 : the trunk is disabled.
4'bxxx1 : pass the frame with trunk ID = 0
4'bxx1x : pass the frame with trunk ID = 1
4'bx1xx : pass the frame with trunk ID = 2
4'b1xxx : pass the frame with trunk ID = 3
bit[7:4] : trunk configuration for port 02
bit[11:8] : trunk configuration for port 03
bit[15:12] : trunk configuration for port 04
Note :
In a trunk group, the configuration should be ORed to 4'b1111
and no more than one port has the same configuration bit.
Example 1:
bit[3:0] = 4’b1100,
bit[7:4] = 4’b0010,
bit[11:8]=4’b0001,
bit[15:12]=4’b0000.
This configuration stands for the following forwarding rule.
Forwarding to port 1 of this group when the hash result defined in
register 21H is 3 or 2.
Forwarding to port 2 of this group when the hash result defined in
register 21H is 1.
Forwarding to port 3 of this group when the hash result defined in
register 21H is 0.
Port 4 is not allowed to forward the data since bit[15:12] is set to
4’b0000.
Example 2:
Bit[3:0]=4’b1100, bit[15:12]=4’b1000 is not allowed.
When the hash result is 3, the switch can not decide to forward the
packet through either port 1 or port 4.
R/W
16’h0000
69H
Trunk group 1 (p8, p7, p6, p5) setting
port 5 ~ port 8 are the same trunk group and can be any
combination to form a trunk
bit[3:0] :
trunk configuration for port 05
bit[7:4] :
trunk configuration for port 06
bit[11:8] :
trunk configuration for port 07
bit[15:12] :
trunk configuration for port 08
R/W
16’d0
6AH
Trunk group 2 (port 17, port 18) setting
port 17 ~port 18 are the same trunk group
bit[3:0] :
trunk configuration for port 17
bit[7:4] :
trunk configuration for port 18
R/W
8’h00
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