acd80900 ETC-unknow, acd80900 Datasheet - Page 20

• Manufacturer Part Number: acd80900
• Description: 24 Ports 10/100 Fast Ethernet Switch Controller
• Manufacturer: ETC-unknow

the control CPU can assign link status for each port.
Table-7.19 describes all the bit of this register.
nFWD register (register 20)
The nFWD register defines the forwarding mode of
each port. Under forwarding mode, a port can forward
Table-7.19: LINK Register
Bit
10
11
12
13
14
15
16
17
18
19
20
21
22
23
0
1
2
3
4
5
6
7
8
9
0 - Port 0 link not established
1 - Port 0 link established
0 - Port 1 link not established
1 - Port 1 link established
0 - Port 2 link not established
1 - Port 2 link established
0 - Port 3 link not established
1 - Port 3 link established
0 - Port 4 link not established
1 - Port 4 link established
0 - Port 5 link not established
1 - Port 5 link established
0 - Port 6 link not established
1 - Port 6 link established
0 - Port 7 link not established
1 - Port 7 link established
0 - Port 8 link not established
1 - Port 8 link established
0 - Port 9 link not established
1 - Port 9 link established
0 - Port 10 link not established
1 - Port 10 link established
0 - Port 11 link not established
1 - Port 11 link established
0 - Port 12 link not established
1 - Port 12 link established
0 - Port 13 link not established
1 - Port 13 link established
0 - Port 14 link not established
1 - Port 14 link established
0 - Port 15 link not established
1 - Port 15 link established
0 - Port 16 link not established
1 - Port 16 link established
0 - Port 17 link not established
1 - Port 17 link established
0 - Port 18 link not established
1 - Port 18 link established
0 - Port 19 link not established
1 - Port 19 link established
0 - Port 20 link not established
1 - Port 20 link established
0 - Port 21 link not established
1 - Port 21 link established
0 - Port 22 link not established
1 - Port 22 link established
0 - Port 23 link not established
1 - Port 23 link established
Description
Default
0
all frames. Under block-and-listen mode, a port will
not forward regular frames, except BPDU frames. If
the spanning tree algorithm discovers redundant links,
the control CPU will allow only one link remaining in
forwarding mode and force all other links into block-
and-listen mode. Setting the associated bit in this reg-
ister will put the port into block-and-listen mode. Table-
7.20 describes all the bit of this register.
Table-7.20: nFWD Register
Bit
10
11
12
13
14
15
16
17
18
19
20
21
22
23
0
1
2
3
4
5
6
7
8
9
0 - Port 0 in forwarding state
1 - Port 0 in block-and-listen state
0 - Port 1 in forwarding state
1 - Port 1 in block-and-listen state
0 - Port 2 in forwarding state
1 - Port 2 in block-and-listen state
0 - Port 3 in forwarding state
1 - Port 3 in block-and-listen state
0 - Port 4 in forwarding state
1 - Port 4 in block-and-listen state
0 - Port 5 in forwarding state
1 - Port 5 in block-and-listen state
0 - Port 6 in forwarding state
1 - Port 6 in block-and-listen state
0 - Port 7 in forwarding state
1 - Port 7 in block-and-listen state
0 - Port 8 in forwarding state
1 - Port 8 in block-and-listen state
0 - Port 9 in forwarding state
1 - Port 9 in block-and-listen state
0 - Port 10 in forwarding state
1 - Port 10 in block-and-listen state
0 - Port 11 in forwarding state
1 - Port 11 in block-and-listen state
0 - Port 12 in forwarding state
1 - Port 12 in block-and-listen state
0 - Port 13 in forwarding state
1 - Port 13 in block-and-listen state
0 - Port 14 in forwarding state
1 - Port 14 in block-and-listen state
0 - Port 15 in forwarding state
1 - Port 15 in block-and-listen state
0 - Port 16 in forwarding state
1 - Port 16 in block-and-listen state
0 - Port 17 in forwarding state
1 - Port 17 in block-and-listen state
0 - Port 18 in forwarding state
1 - Port 18 in block-and-listen state
0 - Port 19 in forwarding state
1 - Port 19 in block-and-listen state
0 - Port 20 in forwarding state
1 - Port 20 in block-and-listen state
0 - Port 21 in forwarding state
1 - Port 21 in block-and-listen state
0 - Port 22 in forwarding state
1 - Port 22 in block-and-listen state
0 - Port 23 in forwarding state
1 - Port 23 in block-and-listen state
Description
Default
20
0