參數(shù)資料
型號(hào): 9880
廠商: Intel Corp.
英文描述: Advanced 10/100 Repeater with Intergrated Management
中文描述: 高級(jí)10/100中繼器與綜合管理
文件頁數(shù): 55/118頁
文件大?。?/td> 1648K
代理商: 9880
Advanced 10/100 Repeater with Integrated Management
LXT9860/9880
Datasheet
Document #: 248987
Revision#: 003
Rev Date: 08/07/01
55
Table 21. SMI Message Fields
Message
Description
Start or Stop Flag
01111110
. Protocol requires zero insertion after any five consecutive
1
s in the data
stream.
Hub ID
Identifies board or sub-system. Assigned by one of two arbitration mechanisms at power-
up.
Chip ID
Identifies one of eight devices on a system. Assigned by 2 external pins on each device.
The Most Significant Bit (MSB) = 0; the value of the other two bits is set by pins.
Command
Identifies the particular operation being performed (see
Table 23
)
Length
Specifies number of registers to be transferred (1 to 127). Maximum is 2 per write, 127 per
read.
Address
Specifies address of register or register block to be transferred.
Figure 14. Serial Management Frame Format
Table 22. SMI Header Storage
MSB
LSB
Increasing
Address
Addr 11
Addr 10
Addr 9
Addr 8
Addr 7
Addr 6
Addr 5
Addr 4
Addr 3
Addr 2
Addr 1
Addr 0
Length 6
Length 5
Length 4
Length 3
Length 2
Length 1
Length 0
CMD 4
Cmd 3
Cmd 2
Cmd 1
Cmd 0
Chip
Address
Bit 2
(set to 0)
Chip
Address
Bit 1
Chip
Address
Bit 0
HubID 4
HubID 3
HubID 2
HubID 1
HubID 0
Hub ID
5 bits
Chip Add
3 bits
Cmd
5 bits
Length
7 bits
Address
12 bits
Data
(0-508 bytes)
Start
Flag
Header
CRC
(2 bytes)
Stop
Flag
Idle
Idle
Header Content:
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