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參數(shù)資料
| 型號(hào)： | 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(cè)，4月2日 |
| 文件頁(yè)數(shù)： | 78/118頁(yè) |
| 文件大小： | 890K |
| 代理商： | L84225 |
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April, 2002
L84225 Quad 100BaseTX/FX/10BaseT Phys. Layer Device - Technical Manual
Copyright 1999-2002 by LSI Logic Corporation. All rights reserved.
fiber interface is disabled (and the TP interface enabled) by connecting
the SD_[3:0]/FXEN_[3:0] pins to GND for that channel.
AutoNegotiation and the scrambler/descrambler are disabled when the
fiber interface is enabled.
The voltage applied to the SD_THR pin sets the input reference level of
the fiber interface for the single ended Signal Detect inputs only. If a 3.3
V fiber transceiver is used with the L84225, this pin should be tied to
GND. If a 5 V fiber transceiver is used, this pin needs to be tied to
VCC(3.3V)-1.3 V (about 2V), but referenced to the 5V supply of the fiber
transceiver. An easy way to do this is with a 15K:10K voltage divider from
the 5 V supply to ground, with the center point of the divider connected
to SD_THR, as shown in
Figure 14
.
4.5.2 Operation with 3.3V Fiber Transceivers
Termination on the differential outputs of the fiber transceiver module
must be observed for proper impedance matching, which is normally the
equivalent of 50 Ohms single ended. The terminating resistor values are
shown in
Figure 13
for FXOP/FXON (outputs), FXIP/ FXIN (inputs) and
SD_[3:0]/FXEN_[3:0] (inputs) for use with 3.3V fiber modules. The
calculated termination resistors on FXOP/FXON are a pull-up of 69.8
Ohms to 3.3V and a pulldown of 174 Ohms to ground.
The termination network at the fiber inputs (FXIP/FXIN and
SD_[3:0]/FXEN_[3:0]) of the L84225 is specified by the fiber module
manufacturer and will normally be a pull-up of 127 Ohms to 3.3V and a
pulldown of 82.5 Ohms to GND, as shown in
Figure 13
. Note that the
Input and Output termination resistor values are different since the output
driver of the Fiber module and the L84225 have a different structure. The
interface network for 3.3V fiber transceiver modules is shown in
Figure 13
.
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