參數(shù)資料
型號： LXT9860AHC
英文描述： Controller Miscellaneous - Datasheet Reference
中文描述： 控制器雜項-數(shù)據(jù)表參考
文件頁數(shù)： 36/96頁
文件大小： 1309K
代理商： LXT9860AHC
LXT980/980A Dual-Speed, 5-Port Fast Ethernet Repeater
36
Datasheet
2.4.3
MMSTRIN, MMSTROUT
This daisy chain is provided for correct gathering of statistics in multiple-device configurations. In
multiple-board applications, this daisy chain must be maintained across boards. In stand-alone
applications, or for the first device in a chain, the MMSTRIN input must be pulled Low in order for
the management counters to work correctly.
Figure 7. IRB Block Diagram
Table 16. IRB Signal Types
Connection Type
Connections Between Devices
(same board)
Connections Between Boards
Full
Connect all.
Connect using buffers.
Local
Connect all.
Do not connect.
Stack
For devices with ChipID
≠
0, pull-up at each
device and
do not interconnect.
Connect devices with ChipID = 0 between boards.
Use one pull-up resistor per stack.
Special (xxISO)
For devices with ChipID
≠
0, leave open.
For device with ChipID
=
0, connect to buffer
enable.
Do not connect.
MMSTR OUT
MMSTR OUT
Digital IRB signals include IRnDAT, IRnENA and IRnCLK.
Local Analog IRB signals include IRnCOL and IRnCFS.
Inter-Board Analog IRB signals include IRnCOLBP and IRnCFSBP.
HOLDCOL is used on the 10Mbps IRB Only.
This diagram shows a single IRB. The LXT980 actually has two independent IRBs, one per speed/segment.
’245
980 ChipID = 0
980 ChipID = 1
980 ChipID = n
Hub Board 1
Digital IRB Signals
Analog IRB Signals
MMSTR
OUT / IN
MMSTR
OUT / IN
MMSTR
OUT
MMSTR
IN
ISOLATE
IRDEN
HOLDCOL
’245
980 ChipID = 0
980 ChipID = 1
980 ChipID = n
Hub Board 2
Digital IRB Signals
Analog IRB Signals
MMSTR
OUT / IN
MMSTR
OUT / IN
MMSTR
OUT
MMSTR IN
ISOLATE
IRDEN
HOLDCOL
’245
980 ChipID = 0
980 ChipID = 1
980 ChipID = n
Hub Board
n
Digital IRB Signals
Analog IRB Signals
MMSTR
OUT / IN
MMSTR
OUT / IN
MMSTR
OUT
MMSTR IN
ISOLATE
IRDEN
HOLDCOL
MMSTR OUT / IN
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