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LXT974BHC Datasheet(PDF) 11 Page - Intel Corporation

Part # LXT974BHC
Description  Fast Ethernet 10/100 Quad Transceivers
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Manufacturer  INTEL [Intel Corporation]
Direct Link  http://www.intel.com
Logo INTEL - Intel Corporation

LXT974BHC Datasheet(HTML) 11 Page - Intel Corporation

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Fast Ethernet 10/100 Quad Transceivers — LXT974/LXT975
Datasheet
11
Table 1.
LXT974 Signal Detect/TP Select Signal Descriptions
Pin#2
Symbol
Type1
Signal Description
158
149
139
130
SD0/TP0
SD1/TP1
SD2/TP2
SD3/TP3
I
Signal Detect - Ports 0 - 3. When SD/TPn pins are tied High or to a 5V PECL input, bit
19.2 = 1 and the operating mode of each respective port is forced to FX mode. In this
mode, full-duplex is set via pin 117 (FDE_FX). When not using FX mode, SD/TPn pins
should be tied to GNDT.
TP Select - Ports 0 - 3. When SD/TPn pins are tied Low, bit 19.2 = 0. The operating mode
of each port can be set to 10BASE-T, 100BASE-TX, or 100BASE-FX via the hardware
control interface pins as shown in Table 8 on page 16.
Note: Hardware control interface pins (CFG_0, CFG_1, CFG_2, FDE, BYPSCR, and
AUTOENA) are global and set all ports simultaneously.
In TP mode, network pins operate as described in Table 2.
In FX mode, network pins are re-mapped and operate as described in Table 3.
1. Type Column Coding: I = Input, O = Output.
2. When not using fiber mode, SD/TPn pins should be tied to GNDT.
Table 2.
LXT974 Twisted-Pair Interface Signal Descriptions
Pin#
Symbol
Type1
Signal Description
154, 157
145, 148
135, 138
126, 129
TPOP0, TPON0
TPOP1, TPON1
TPOP2, TPON2
TPOP3, TPON3
O
Twisted-Pair Outputs, Positive & Negative - Ports 0-3.
During 100BASE-TX or 10BASE-T operation, TPO pins drive 802.3 compliant
pulses onto the line.
151, 152
142, 143
132, 133
123, 124
TPIP0, TPIN0
TPIP1, TPIN1
TPIP2, TPIN2
TPIP3, TPIN3
I
Twisted-Pair Inputs, Positive & Negative - Ports 0-3.
During 100BASE-TX or 10BASE-T operation, TPI pins receive differential
100BASE-TX or 10BASE-T signals from the line.
1. Type Column Coding: I = Input, O = Output.
Table 3.
LXT974 Fiber Interface Signal Descriptions
Pin#
Symbol
Type1
Signal Description
154, 157
145, 148
135, 138
126, 129
FIBIN0, FIBIP0
FIBIN1, FIBIP1
FIBIN2, FIBIP2
FIBIN3, FIBIP3
I
Fiber Inputs, Positive & Negative - Ports 0-3.
During 100BASE-FX operation, FIBI pins receive differential PECL inputs
from fiber transceivers.
151, 152
142, 143
132, 133
123, 124
FIBOP0, FIBON0
FIBOP1, FIBON1
FIBOP2, FIBON2
FIBOP3, FIBON3
O
Fiber Outputs, Positive & Negative - Ports 0-3.
During 100BASE-FX operation, FIBO pins produce differential PECL
outputs for fiber transceivers.
1. Type Column Coding: I = Input, O = Output.


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