參數(shù)資料
型號(hào): L80227
廠商: LSI CORP
元件分類: 網(wǎng)絡(luò)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): 41/158頁
文件大?。?/td> 1084K
代理商: L80227
Draft 6/5/00
Block Diagram Description
2-21
Copyright 1999 by LSI Logic Corporation. All rights reserved.
Figure 2.5
TP Input Voltage Template (10 Mbits/s)
2.3.8.3 Squelch (100 Mbits/s)
The Squelch block determines if the TP input contains valid data. The
100 Mbits/s TP squelch is one of the criteria used to determine link
integrity. The squelch comparators compare the TP inputs against fixed
positive and negative thresholds, called squelch levels. The output from
the squelch comparator goes to a digital squelch circuit, which
determines whether the receive input data on that port is valid. If the data
is invalid, the receiver is in the squelched state. If the input voltage
exceeds the squelch levels at least four times with alternating polarity
within a 10
μ
s interval, the squelch circuit determines that the data is
valid and the receiver enters into the unsquelch state.
In the unsquelch state, the receive threshold level is reduced by
approximately 30% for noise immunity reasons and is called the
unsquelch level. When the receiver is in the unsquelch state, the input
signal is considered valid.
The device stays in the unsquelch state until loss of data is detected.
Loss of data is detected if no alternating polarity unsquelch transitions
Short Bit
585 mV sin (
π
t/PW)
0
PW
585 mV
3.1 V
Slope 0.5 V/ns
585 mV
3.1 V
Long Bit
585 mV sin[2
π
(t
PW2)/PW)]
585 mV sin (
π
t/PW)
Slope 0.5 V/ns
0
PW/4
3PW/4
PW
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L80227/B 制造商:LSI Corporation 功能描述: 制造商:LSI Corporation 功能描述:L80227/B
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L80227-I-LEADFREE 制造商:LSI Corporation 功能描述:796000124413