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| 型號： | MB86976PF-G |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 2 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP144 |
| 封裝： | PLASTIC, QFP-144 |
| 文件頁數(shù)： | 36/46頁 |
| 文件大?。?/td> | 212K |
| 代理商： | MB86976PF-G |
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MB86976
Fujitsu Microelectronics, Inc.
41
Advanced 11/5/98
Ethernet 2.0 Protocol Filtering Example
To forward frames to the WAN transmit port based on the Ethernet v2.0 protocol field for AppleTalk over Ethernet (809B hex), use
SNAP Encapsulated Filtering Example
to selectively forward frames to the processor based on SNAP encapsulated protocol field denoting AppleTalk over Ethernet (809B), the
following table entries may be used:
The filter string that is searched for is: 05 DD AA AA 03 08 00 07 80 9B h::
Note* : the incoming value 05DDh is matched using the ‘<‘ operator on data value 05DCh, to allow for a range of such values from
05DDh to FFFFh in the protocol field.
Multiple Filtering Examples
Through judicious partitioning of the 24 available table entries, up to 8 multiple filters can be constructed. For example, the look-up
table could be configured to search for both 6 source addresses and 2 Ethernet protocols: note that the addresses and the protocols must
be interleaved in offset order. This uses a total of 20 table entries, and all 8 filters.
Alternatively, 4 different SNAP protocols, 1 source address, and one Ethernet protocol could be filtered using 6 filters and 24 table
entries:
bit[15]
bit[14:10]
bit[9:8]
bit[7]
bit[6]
bit[5:3]
bit[2]
bit[1:0]
mask word
data word
enable
word offset
destination
start
stop
filter id
unused
operation
mask value
data value
1
00110
10
1
filter #
0
00
FFFFh
809Bh
bit[15]
bit[14:10]
bit[9:8]
bit[7]
bit[6]
bit[5:3]
bit[2]
bit[1:0]
mask word
data word
enable
word offset
destination
start
stop
filter id
unused
operation
mask value
data value
1
00110
10
1
0
filter #
0
01 *
FFFFh
05DCh *
1
00111
10
0
filter #
0
00
FFFFh
AAAAh
1
01000
10
0
filter #
0
00
FFFFh
0308h
1
01001
10
0
filter #
0
00
FFFFh
0007h
1
01010
10
0
1
filter #
0
00
FFFFh
809Bh
Type
# of bits
# of table entries
# of instances
total entries used
source address
48
3
6
18
Ethernet protocol
16
1
2
Type
# of bits
# of table entries
# of instances
total entries used
SNAP protocol
80
5
4
20
source address
48
3
1
3
Ethernet protocol
16
1
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