參數(shù)資料
型號(hào)： LXT980AHC
英文描述： LAN HUB CONTROLLER
中文描述： 局域網(wǎng)集線器控制器
文件頁(yè)數(shù)： 35/96頁(yè)
文件大?。?/td> 1309K
代理商： LXT980AHC
LXT980/980A Dual-Speed, 5-Port Fast Ethernet Repeater
Datasheet
35
2.4
IRB Operation
The Inter Repeater Backplane (IRB) allows multiple devices to operate as a single logical repeater,
exchanging data collision status information. Each segment on the LXT980 has its own complete,
independent IRB. The backplanes use a combination of digital and analog signals as shown in
Figure 7
. IRB signals can be characterized by connection type as Local (connected between
devices on the same board), Stack (connected between boards) or Full (connected between devices
on the same board
and
between different boards). Refer to
Table 16
and
Table 17
for details on
buffering and pull-up requirements, and to
Figure 22 on page 57
and
Figure 23 on page 57
for
application circuitry.
2.4.1
MAC IRB Access
The MACACTIVE TTL-level pin allows an external MAC or other digital ASIC to interface
directly to the 10 Mbps IRB. When the MACACTIVE pin is asserted, the LXT980 will drive the
IR10CFS and IR10CFSBP signals on behalf of the external device, allowing it to participate in
collision detection functions.
2.4.2
IRB Isolation
The ISOLATE outputs (IR10ISO and IR100ISO) are provided to control the enable pins of external
bidirectional transceivers. In multi-board applications, they can be used to isolate one board from
the rest of the system. Only one device can control these signals. The output states of these pins are
controlled by the Isolate bits in the Master Configuration Register.
Note:
Inter-board analog signals will be isolated internally by the device.
Table 15. LED Mode 3 Indications
LED
Operating
Mode
Hardware Control
Software Control
On
Blink
Off
PORT
n
LED1
10 Mbps
operation
Link up, not partitioned
N/A
Any other state
Off via port LED
Control Register,
address 0B2
100 Mbps
operation
Link up, not partitioned,
not isolated
N/A
Any other state
PORT
n
LED2
10 or 100
Mbps ops
Receive activity
(20 ms pulse)
N/A
Any other state
PORT
n
LED3
Auto-neg
enabled
100 Mbps link up
No link
(fast blink)
1
10 Mbps link up
Auto-neg
disabled
100 Mbps link selected,
link may be up or down
N/A
10 Mbps link
selected, link may be
up or down
RPS
Any
Present, fault
N/A
Any other state
N/A
Global
FAULT
Any
Any port partitioned,
any port isolated or
RPS fault
N/A
Any other state
Off via global LED
Control Register,
address 0B1
1. Setting AUTO_BLINK (Pin 74) High disables blink (
LXT980A only
).
相關(guān)PDF資料
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LXT980QC 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:LAN HUB CONTROLLER
LXT9860 制造商:INTEL 制造商全稱(chēng):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(chēng):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(chēng):未知廠家 功能描述:Controller Miscellaneous - Datasheet Reference
LXT9863 制造商:INTEL 制造商全稱(chēng):Intel Corporation 功能描述:Advanced 10/100 Umnmanaged Repeater
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