參數(shù)資料
型號: 9880
廠商: Intel Corp.
英文描述: Advanced 10/100 Repeater with Intergrated Management
中文描述: 高級10/100中繼器與綜合管理
文件頁數(shù): 54/118頁
文件大?。?/td> 1648K
代理商: 9880
LXT9860/9880
Advanced 10/100 Repeater with Integrated Management
54
Datasheet
Document #: 248987
Revision#: 003
Rev Date: 08/07/01
3.10.2.3
SMI Frame Format
The SMI uses a simple frame format, shown in
Figure 14
.
Table 21
describes the individual fields.
Table 22
shows how the bits for the header field are stored in memory, assuming that they are
transmitted LSB to MSB, low address to high address.
Table 23
lists the command set and
Table 24
provides a variety of typical packets.
All frames begin and end with a simple flag consisting of
01111110
. Multiple flags cause the
LXT98x0 to ignore the packet. All fields are transmitted LSB first. Zero-bit stuffing is required if
more than five 1s in a row appear in the header, data or CRC fields. In addition, all operations
directed to the device must be followed by an idle (at least 12 ones in a row), and the first operation
must be preceded with an idle.
Note:
The LXT98x0 uses the CCITT method of CRC (X
16
+ X
12
+ X
5
+1).
Figure 12. SMI Collision Handling
Figure 13. SMI Address Match Indication
Pkt 1-Succeeds
Pkt 2-Ceases, due to collision
Pkt 3-Ceases, due to collision
Data
Data
Data
Clk
1. Simultaneous Transmissions, Pkt 1 completes
Transmit om falling CLK edge, sample on rising CLK edge.
HUB ID
CHIP ID, etc.
SRX/STX
SER_MATCH
SERCLK
1. SER_MATCH can also occur at the end of a packet if a Start Flag is not seen but a Stop Flag is.
This can occur only during unit installation or removal.
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