參數(shù)資料
型號(hào)： LXT980QC
英文描述： LAN HUB CONTROLLER
中文描述： 局域網(wǎng)集線器控制器
文件頁數(shù)： 31/96頁
文件大?。?/td> 1309K
代理商： LXT980QC
LXT980/980A Dual-Speed, 5-Port Fast Ethernet Repeater
Datasheet
31
Multiple devices on the same board can share a single common PROM. The LXT980 with ChipID
= 0 actively reads the PROM at power-up; all other LXT980s listen in. If PROM arbitration is not
used, the PROM data input signal must be tied either High or Low. Refer to
Table 10 on page 18
for PROM interface pin assignments and signal descriptions.
2.2.6
Chip ID
Each LXT980 on a board requires a unique 3-bit Chip ID value asserted on these pins in order for
the Serial Management Interface (SMI) to function correctly. One LXT980 on each board must be
assigned ChipID = 0.
2.2.6.1
When Substituting a LXT983 Device
The LXT983 can be substituted in LXT980 designs for a 10/100Mbps unmanaged solution without
changing the LXT980 Chip ID pin states. The LXT980 Chip ID 0, Chip ID 1, and Chip ID 2 pins
are renamed FPS, GND, and GND respectively for the LXT983. For cascading, the first LXT983
device is addressed 000 and all others 001 as indicated by the pin names. The LXT983 requires one
chip to have the LXT980-equivalent address 000 and all other LXT983s a non-000 address.
2.2.7
Management Master I/O Link
In multiple device applications, the Management Master daisy chain (MMSTRIN/MMSTROUT)
ensures that collisions are counted correctly. Connect the MMSTRIN input to the MMSTROUT
output of the previous device, even across board boundaries. Ground the MMSTRIN input of the
first or only device in the system. In hot-swap applications, resistive bypassing can be used with a
value between 1 and 3 k
.
2.2.8
IRB Bus Pull-ups
Even when the LXT980 is used in a stand-alone configuration, pull-up resistors are required on the
IRB signals listed below. See
Figure 22 on page 57
and
Figure 23 on page 57
for sample circuits.
2.3
LED Operation
The LXT980 provides three types of LED indicators: port, segment, and global (refer to
Table 8 on
page 16
). Three user-selectable LED modes determine pin conditions and how particular
conditions are indicated. The LED mode is selected via the LEDSEL<1:0> pins and reflected in an
100 Mbps IRB
10Mbps IRB
IR100CFS
IR10DAT
IR100CFSBP
IR10ENA
IR100DV
IR10COL
IR100CLK
IR10CFS
IR10COLBP
IR10CFSBP
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LXT9860 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Advanced 10/100 Repeater with Intergrated Management
LXT9860AHC 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Controller Miscellaneous - Datasheet Reference
LXT9860HC 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Controller Miscellaneous - Datasheet Reference
LXT9863 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Advanced 10/100 Umnmanaged Repeater
LXT9863HC 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LAN HUB CONTROLLER
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