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參數(shù)資料
| 型號： | 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)交換機控制器 |
| 文件頁數(shù)： | 63/85頁 |
| 文件大?。?/td> | 4222K |
| 代理商： | ADM6926 |
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ADM6926
Function Description
Field Description in the Status Register
Field
Description
MAC Address[47:0] After the search operation is successful, the switch will return the MAC address in this field. If the
search fails, this field doesn’t mean anything.
Forwarding Group[4:0] After the search operation is successful, the switch will return the Forwarding Group in this. If the
search fails, this field doesn’t mean anything.
Output Port[4:0]/
Multicast Index[4:0]
field. The users could use the entry_state[1] returned to distinguish if the entry should point to the
multicast output port map table.
Occupy
After the search is successful, the switch will return the value indicating if the entry existed.
1 = The searched entry exists.
0 = The searched entry doesn’t exist.
Entry State[0]
After the search is successful, the switch will return the value in this field indicating if value is
static.
1 = The searched entry is static.
0 = The searched entry is not static and will be aged.
Entry State[1]
After the search is successful, the switch will return the value in this field indicating if the entry
points to the multicast output port map table.
1 = The entry points to the multicast output port map table.
0 = The entry doesn’t point to the multicast output port map table.
Bad State
After the search is successful, the switch will return the value indicating if the entry is bad.
1 = The entry is bad and isn’t used for data storage.
0 = The entry is not bad and will be used for data storage.
Command Result[2:0] This field indicates the access result.
000 = Command OK
001 = All Entry Used. This result happens only for the create operation. ADM6926 uses the 4-way
address lookup engine so it allows 4 different addresses stored at each hash location. If
these 4 entries are all static, then CPU will not successfully create 5
th
different address
hashed to the same location and 001 will be returned. The only way to create 5
th
different address is
to remove one of early addresses.
010 = Entry Not Found.
011 = Try Next Entry.
101 = Command Error.
Busy
This bit indicates if the table engine for access is available.
1 = The engine is busy and it will not access the command from the CPU.
0 = The engine is available.
2. Rules to access the address table
2.1 Check the Busy Bit in the status register to see if the access engine is available. If the
engine is busy, wait until the
engine is free. If the engine is available, go to the following step.
2.2 Write the MAC address[31:0] into the control register 0.
2.3 Write the MAC address[47:32], Forwarding Group, Output Port/Multicast Index,
Control Field and the Entry State
into the control register 1.
2.4 Write the Command into the control register 2 to define the operation.
2.5 Wait for the engine to complete (Check the Busy Bit).
2.6 Read the desired result returned in the status register.
Note:
Before the “Search command”, the CPU should execute the “Initial command” to
initial the search pointer. The search engine could search the aim from the top to the
bottom. The search engine has an ability to automatically move the pointer to the
After the search operation is successful, the switch will return output port / multicast index in this
ADMtek Inc.
3-47
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