參數(shù)資料
型號(hào)： LU3X31T-T64
廠商： Lineage Power
英文描述： Single-Port 3 V 10/100 Ethernet Transceiver TX/FX(單端口 3 V 10M位和100M位以太網(wǎng)收發(fā)器)
中文描述： 單端口3伏10/100以太網(wǎng)收發(fā)器德克薩斯州/外匯（單端口3伏1000萬(wàn)位和100米位以太網(wǎng)收發(fā)器）
文件頁(yè)數(shù)： 12/44頁(yè)
文件大?。?/td> 580K
代理商： LU3X31T-T64
12
Lucent Technologies Inc.
LU3X31T-T64 Single-Port 3 V
10/100 Ethernet Transceiver TX
Preliminary Data Sheet
July 2000
Functional Description
(continued)
5-6781(F).ar.2
Figure 3. 100Base-X Data Path
EQUALIZER
CLOCK
RECOVERY
SERIAL
TO
PARALLEL
DE-
SCRAMBLER
5B/4B
DECODE
RECEIVE
STATE
MACHINE
TRANSMIT
STATE
MACHINE
4B/5B
ENCODE
SCRAMBLER
PARALLEL
TO
SERIAL
MLT-3
STATE
MACHINE
10/100
TRANSMIT
DRIVER
TPRX
±
TPTX
±
100 Mbit PHY
LOOPBACK PATH
BYP-SCR
BYP-4B5B
BYP-ALIGN
RXCLK
RXD[3:0]
CRS
RXDV
RXER
100BASE-X RECEIVER
100BASE-X TRANSMITTER
COL
TXCLK
TXEN
TXER
TXD[3:0]
BYP-4B5B
BYP-SCR
BYP-ALIGN
100Base-X Transmitter
The 100Base-X transmitter consists of functional
blocks which convert synchronous 4-bit nibble data, as
provided by the MII, to a 125 Mbits/s serial data
stream. The LU3X31T-T64 implements the 100Base-X
transmit state machine as specified in the IEEE 802.3u
Standard, Clause 24 and comprises the following func-
tional blocks in its data path:
I
Symbol encoder
I
Scrambler block
I
Parallel/serial converter and NRZ/NRZI encoder
block
Symbol Encoder.
The symbol encoder converts 4-bit
(4B) nibble data generated by the MAC into 5-bit (5B)
symbols for transmission. This conversion is required
to allow control symbols to be combined with DATA
symbols. Refer to the table below for 4B to 5B symbol
mapping.
Following onset of the TXEN signal, the 4B/5B symbol
encoder replaces the first two nibbles of the preamble
from the MAC frame with a /J/K code-group pair (11000
10001) start-of-stream delimiter (SSD). The symbol
encoder then replaces subsequent 4B codes with cor-
responding 5B symbols. Following negation of the
TXEN signal, the encoder substitutes the first two IDLE
symbols with a /T/R code-group pair (01101 00111)
end-of-stream delimiter (ESD) and then continuously
injects IDLE symbols into the transmit data stream until
the next transmit packet is detected.
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