參數(shù)資料
型號： L84225
英文描述： L84225 100BaseTX/FX/10BaseT Physical Layer Device technical manual 4/02
中文描述： L84225 100BaseTX/FX/10BaseT物理層設(shè)備的技術(shù)手冊，4月2日
文件頁數(shù)： 35/118頁
文件大?。?/td> 890K
代理商： L84225
Functional Description
Copyright 1999-2002 by LSI Logic Corporation. All rights reserved.
35 of 118
April, 2002
signal detect input is deasserted, the channel is placed in the Link Fail
state and the input data on FXIP/FXIN is determined to be invalid.
The SD_THR pin adjusts the ECL trip point of the SD/ FXEN input. When
the SD_THR pin is tied to a voltage between GND and GND+0.45V, the
trip point of the SD ECL input buffer is internally set to VCC-1.3V. When
SD_THR pin is set to a voltage greater than GND+0.85v, the trip point
of the SD SD/FXEN ECL input buffer is set to the voltage that is applied
to the SD_THR pin. The trip level for the SD/FXEN input buffer must be
set to VCC- 1.3V. Having external control of the SD/FXEN buffer trip level
with the SD_THR pin allows this trip level to be referenced to an external
supply which facilitates connection to both 3.3V and 5V external fiber
optic transceiver. If the device is to be connected to a 3.3V external fiber
optic transceiver, then SD_THR should be tied to GND. If the device is
to be connected to a 5V external fiber optic transceiver, then SD_THR
needs to be tied to VCC-1.3V, and this can be done so with an external
resistor divider. Refer to
Section 4, “Application Information,” page 70
, for
more details on connections to external fiber optic transceivers.
2.10.5 Fiber Interface Disable
The Fiber Interface will be disabled if the SD/FXEN pin is tied to GND.
Disabling the Fiber Interface automatically enables the TP interface.
2.10.6 Far End Fault
Each channel has the Far End Fault capability, referred to as FEF, and
defined in IEEE 802.3 specifications. FEF is a method by which the Fiber
Interface can signal a fault to a remote device by transmitting an idle
pattern consisting of 84 ‘1’s followed by a single ‘0’ repeatedly (idle
period normally has all 1’s). FEF was specified in IEEE 802.3 because
FX lacks the AutoNegotiation capability to signal a remote fault to
another station.
FEF can only be made operational only when the Fiber Interface is
enabled. In the device default state with the Fiber Interface enabled, FEF
is disabled, but it can be enabled by setting the FEF select bit in the MI
serial port Global Configuration register. When FEF is enabled, (1) a ‘0’
is transmitted after each group of 84 ‘1’s repeatedly during idle if the
SD/FXEN pin is deasserted, and (2) if an FEF stream is detected by the
receiver for 3 consecutive intervals, the remote fault bit is set in the MI
serial port Status register and the LED0 output pin is asserted.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L84225/B1 制造商:LSI Corporation 功能描述:
L8446-04 制造商:HAMAMATSU 制造商全稱:Hamamatsu Corporation 功能描述:CW LASER DIODES
L8446-06 制造商:HAMAMATSU 制造商全稱:Hamamatsu Corporation 功能描述:CW LASER DIODES
L8446-07 制造商:HAMAMATSU 制造商全稱:Hamamatsu Corporation 功能描述:CW LASER DIODES
L8446-41 制造商:HAMAMATSU 制造商全稱:Hamamatsu Corporation 功能描述:CW LASER DIODES
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