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| 型号： | WJLXT972ALC.A4 |
| 厂商： | INTEL CORP |
| 元件分类： | 网络接口 |
| 英文描述： | DATACOM, ETHERNET TRANSCEIVER, PQFP64 |
| 封装： | ROHS COMPLIANT, LQFP-64 |
| 文件页数： | 47/97页 |
| 文件大小： | 1281K |
| 代理商： | WJLXT972ALC.A4 |
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Intel
LXT972A Single-Port 10/100 Mbps PHY Transceiver
Datasheet
51
Document Number: 249186-004
Revision Date: 25-Oct-2005
5.7.3.3
Twisted-Pair Physical Medium Dependent Sublayer
The twisted-pair Physical Medium Dependent (PMD) layer provides signal scrambling and de-
scrambling functions, line coding and decoding functions (MLT-3 for 100BASE-TX, Manchester
for 10BASE-T), as well as receiving, polarity correction, and baseline wander correction functions.
5.7.3.3.1
Scrambler/Descrambler
The purpose of the scrambler/descrambler is to spread the signal power spectrum and further
reduce EMI using an 11-bit, data-independent polynomial. The receiver automatically decodes the
polynomial whenever IDLE symbols are received.
Scrambler Seeding. Once the transmit data (or Idle symbols) are properly encoded, they are
scrambled to further reduce EMI and to spread the power spectrum using an 11-bit scrambler seed.
Five seed bits are determined by the PHY address, and the remaining bits are hard coded in the
design.
Scrambler Bypass. The scrambler/de-scrambler can be bypassed by setting Register bit 16.12 = 1.
Scrambler bypass is provided for diagnostic and test support.
5.7.3.3.2
Polarity Correction
The 100 Mbps twisted pair signaling is not polarity sensitive. As a result, the polarity status is not a
valid status indicator.
5.7.3.3.3
Baseline Wander Correction
The LXT972A Transceiver provides a baseline wander correction function for when the LXT972A
Transceiver is under network operating conditions. The MLT3 coding scheme used in 100BASE-
TX is by definition “unbalanced”. As a result, the average value of the signal voltage can “wander”
significantly over short time intervals (tenths of seconds). This wander can cause receiver errors at
long-line lengths (100 meters) in less robust designs. Exact characteristics of the wander are
completely data dependent.
The LXT972A Transceiver baseline wander correction characteristics allow the device to recover
error-free data while receiving worst-case packets over all cable lengths.
5.7.3.3.4
Programmable Slew Rate Control
The LXT972A Transceiver device supports a programmable slew-rate mechanism whereby one of
four pre-selected slew rates can be used. (For details, see Table 56, “Transmit Control Register -
Address 30, Hex 1E” on page 93.) The slew-rate mechanism allows the designer to optimize the
output waveform to match the characteristics of the magnetics.
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| WJLXT972ALC.A4 | DATACOM, ETHERNET TRANSCEIVER, PQFP64 |
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相关代理商/技术参数 |
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| WJLXT972MLC.A4 | 功能描述:IC TRANS 3.3V ETHERNET 48-LQFP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:25 系列:- 类型:收发器 驱动器/接收器数:2/2 规程:RS232 电源电压:4.5 V ~ 5.5 V 安装类型:通孔 封装/外壳:16-DIP（0.300"，7.62mm） 供应商设备封装:16-PDIP 包装:管件 |
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| WJLXT972MLC.A4-864115 | 功能描述:TXRX ETH 10/100 SGL PORT 48-LQFP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:收发器 驱动器/接收器数:1/1 规程:RS422，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 产品目录页面:1402 (CN2011-ZH PDF) |
| WJLXT972MLCA4 | 制造商:Cortina Systems Inc 功能描述: |
| WJM1000 | 功能描述:射频模块 902-928 MHz US ISM EPC Class 1 Gen 2 RoHS:否 制造商:Linx Technologies 产品:Transceiver Modules 频带:902 MHz to 928 MHz 输出功率:- 15.5 dBm to + 12.5 dBm 接口类型:UART 工作电源电压:- 0.3 VDC to + 5.5 VDC 传输供电电流:38.1 mA 接收供电电流:22.7 mA 天线连接器类型:U.FL 最大工作温度:+ 85 C 尺寸:1.15 mm x 0.63 mm x 0.131 mm |
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