參數(shù)資料
型號: L80227
廠商: LSI CORP
元件分類: 網(wǎng)絡接口
英文描述: 10BASE-T/100BASE-TX Ethernet Physical Layer Device (PHY)(10BASE-T/100BASE-TX 以太網(wǎng)物理層處理器)
中文描述: DATACOM, ETHERNET TRANSCEIVER, PQFP64
封裝: LQFP-64
文件頁數(shù): 27/158頁
文件大?。?/td> 1084K
代理商: L80227
Draft 6/5/00
Overview
2-7
Copyright 1999 by LSI Logic Corporation. All rights reserved.
In 100BASE-TX receive operation, the TP receiver takes incoming
encoded and scrambled MLT3 data from the twisted-pair cable, removes
any high-frequency noise from the input, equalizes the input signal to
compensate for the effects of the cable, performs baseline wander
correction, qualifies the data with a squelch algorithm, and converts the
data from MLT3-encoded levels to internal digital levels. The output of the
receiver then goes to a clock and data recovery block that recovers a
clock from the incoming data, uses the clock to latch valid data into the
device, and converts the data back to NRZ format. The 4B5B decoder
and descrambler then decodes and descrambles the NRZ data,
respectively, and sends it out of the Controller Interface to an external
Ethernet controller. The format of the received data at the Controller
interface is as shown in
Table 2.3
.
2.2.3.2 10BASE-T
10BASE-T operation is similar to the 100BASE-TX operation except:
There is no scrambler/descrambler
The encoder/decoder is Manchester instead of 4B5B
The data rate is 10 Mbits/s instead of 100 Mbits/s,
The twisted-pair symbol data is two-level Manchester instead of
ternary MLT-3.
The transmitter generates link pulses during the idle period
The transmitter detects the jabber condition
The receiver detects link pulses and implements the AutoNegotiation
algorithm
Table 2.3
Receive Preamble and SFD Bits at MAC Nibble Interface
Signals
Bit Value
RXDO
X
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
D0
3
D4
4
RXD1
X
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
D1
D5
RXD2
X
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
D2
D6
RXD3
X
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
D3
D7
RX_DV
1. First preamble nibble received. Depending on the mode, the device may eliminate either all or some
of the preamble nibbles, up to the first SFD nibble.
2. First SFD nibble received.
3. First data nibble received.
4. D0 through D7 are the first 8 bits of the data field.
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
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