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參數(shù)資料
| 型號： | 82596SX |
| 廠商： | Intel Corp. |
| 英文描述： | HIGH-PERFORMANCE 32-BIT LOCAL AREA NETWORK COPROCESSOR |
| 中文描述： | 高性能的32位局域網(wǎng)協(xié)處理器 |
| 文件頁數(shù)： | 43/77頁 |
| 文件大小： | 787K |
| 代理商： | 82596SX |
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82596DX/SX
MULTICAST-SETUP
This command is used to load the 82596 with the Multicast-IDs that should be accepted. As noted previously,
the filtering done on the Multicast-IDs is not perfect and some unwanted frames may be accepted. This
command resets the current filter and reloads it with the specified Multicast-IDs. The format of the Multicast-
addresses setup command is:
31
16
ODD WORD
15
0
EVEN WORD
EL S
I
X
X
X
X
X
X
X
X
X
X
0
1
1
C
B OK A
0
0
0
0
0
0
0
0
0
0
0
0
X
X
MC COUNT
A15
A0
LINK OFFSET
4th byte
1st byte
MULTICAST ADDRESSES LIST
Nth byte
Figure 26. MC SetupD82586 and 32-Bit Segmented Modes
31
16
ODD WORD
15
0
EVEN WORD
EL S
I
0
0
0
0
0
0
0
0
0
0
0
1
1
C
B OK A
0
0
0
0
0
0
0
0
0
0
0
0
A31
A0
LINK ADDRESS
2nd byte
1st byte X
X
MC COUNT
MULTICAST ADDRESSES LIST
Nth byte
Figure 27. MC SetupDLinear Mode
where:
LINK ADDRESS,
EL, B, C, I, S
D As per standard Command Block (see the NOP command for details)
A
D Indicates that the command was abnormally terminated due to a CU Abort control
command. If one, then the command was aborted and if necessary it should be
repeated. If this bit is zero, the command was not aborted.
Bits 19–28
D Reserved (0 in both the 32-Bit Segmented and Linear Modes).
CMD (bits 16–18)
D The MC SETUP command value: 3h.
MC-CNT
This 14-bit field indicates the number of bytes in the MC LIST field. The MC CNT
must be a multiple of the ADDR LEN; otherwise, the 82596 reduces the MC CNT to
the nearest ADDR LEN multiple. MC CNT
e
0 implies resetting the Hash table
which is equivalent to disabling the Multicast filtering mechanism.
MC LIST
D A list of Multicast Addresses to be accepted by the 82596. The least significant bit
of each MC address must be 1.
NOTE:
The list is sequential; i.e., the most significant byte of an address is immediately followed by the least signifi-
cant byte of the next address.
D When the 82596 is configured to recognize multiple Individual Address (Multi-IA),
the MC-Setup command is also used to set up the Hash table for the individual
address.
The least significant bit in the first byte of each IA address must be 0.
43
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