參數(shù)資料
型號(hào)： ADM6926
廠商： Electronic Theatre Controls, Inc.
英文描述： 26 port 10/100 Mbps Ethernet Switch Controller
中文描述： 26端口10/100 Mbps以太網(wǎng)交換機(jī)控制器
文件頁(yè)數(shù)： 62/85頁(yè)
文件大小： 4222K
代理商： ADM6926
ADM6926
Function Description
Field Description in the Control Register
Field
Description
MAC Address[47:0] This field is 48-bit layer 2 address. The address could be the unicast address or the multicast
address.
Forwarding Group[4:0] This field describes the Learning Group the address belongs to.
Output Port[4:0]/
Multicast Index[4:0]
multicast index.
The Static Bit. When this bit is set to a one, then the address entry will not be aged forever. This bit
could be changed only through the CPU’s help.
Entry State[1]
This bit is used to distinguish the output port/ multicast index field.
When a match (the same MAC address and the same forwarding group in the address table) is
found, the value in the output port field is returned as the output port, and may be modified by the
forwarding group before the packet is transferred to the output queue.
When a match (the same MAC address and the same forwarding group in the address table) is
found, the multicast output port map entry addressed by the multicast index is returned as the output
port map, and may be modified by the forwarding group before the packet is transferred to the
output queue.
The command and control fields are combined to provide different operations. Before the operation
Command Field[2:0]/
Control Field[3:0]
is initiated, users should confirm if the search engine is available. See the busy bit in the status
This field has two means. One is described as the output port and the other is described as the
register.
Command Field Control Field
Operation
0111
1111
1111
0000
1001
Create a new address
Overwrite an existed address
Erase an existed address
Search an empty address
000
001
010
010
Search by the port in the Output Port field
Search by the forwarding group specified in the Forwarding
Group field
Search by the address specified in the MAC Address field.
Search by the address and forwarding group
Search by the address and output port
Search by the forwarding group and the output port
Search by the address, the forwarding group and the output port
Initial to location by the address field
Initial to the first address
010
1010
010
010
010
010
010
011
011
1100
1110
1101
1011
1111
0100
0000
Entry State[0]
000
Status Register Description
Command
Result
Status_2
[2:0]
Bad State Entry State Occupy
Output Port/
Multicast Index
Status_1
[25:21]
Forwarding
Group
Status_1
[20:16]
MAC Address
Status_2
[3]
Status_1
[29]
Status_1
[28:27]
Status_1
[26]
{Status_1[15:0], Status_0[31:0]}
Busy
ADMtek Inc.
3-46
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