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LAN8700IC-AEZG 参数 Datasheet PDF下载

LAN8700IC-AEZG图片预览
型号: LAN8700IC-AEZG
PDF下载: 下载PDF文件 查看货源
内容描述: [LAN Controller, 4 Channel(s), 12.5MBps, CMOS, 6 X 6 MM, 0.90 MM HEIGHT, ROHS COMPLIANT, QFN-36]
分类和应用: 通信时钟局域网数据传输外围集成电路
文件页数/大小: 83 页 / 687 K
品牌: SMSC [ SMSC CORPORATION ]
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±15kV ESD Protected MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support and flexPWR® Technology in a Small Footprint  
Datasheet  
Table 4.1 4B/5B Code Table (continued)  
CODE  
GROUP  
RECEIVER  
INTERPRETATION  
TRANSMITTER  
INTERPRETATION  
SYM  
11001  
00000  
00001  
00010  
00011  
00101  
01000  
01100  
10000  
V
V
V
V
V
V
V
V
V
INVALID, RX_ER if during RX_DV  
INVALID, RX_ER if during RX_DV  
INVALID, RX_ER if during RX_DV  
INVALID, RX_ER if during RX_DV  
INVALID, RX_ER if during RX_DV  
INVALID, RX_ER if during RX_DV  
INVALID, RX_ER if during RX_DV  
INVALID, RX_ER if during RX_DV  
INVALID, RX_ER if during RX_DV  
INVALID  
INVALID  
INVALID  
INVALID  
INVALID  
INVALID  
INVALID  
INVALID  
INVALID  
4.2.3  
Scrambling  
Repeated data patterns (especially the IDLE code-group) can have power spectral densities with large  
narrow-band peaks. Scrambling the data helps eliminate these peaks and spread the signal power  
more uniformly over the entire channel bandwidth. This uniform spectral density is required by FCC  
regulations to prevent excessive EMI from being radiated by the physical wiring.  
The seed for the scrambler is generated from the PHY address, PHYAD[4:0], ensuring that in multiple-  
PHY applications, such as repeaters or switches, each PHY will have its own scrambler sequence.  
The scrambler also performs the Parallel In Serial Out conversion (PISO) of the data.  
4.2.4  
4.2.5  
NRZI and MLT3 Encoding  
The scrambler block passes the 5-bit wide parallel data to the NRZI converter where it becomes a  
serial 125MHz NRZI data stream. The NRZI is encoded to MLT-3. MLT3 is a tri-level code where a  
change in the logic level represents a code bit “1” and the logic output remaining at the same level  
represents a code bit “0”.  
100M Transmit Driver  
The MLT3 data is then passed to the analog transmitter, which drives the differential MLT-3 signal, on  
outputs TXP and TXN, to the twisted pair media across a 1:1 ratio isolation transformer. The 10Base-  
T and 100Base-TX signals pass through the same transformer so that common “magnetics” can be  
used for both. The transmitter drives into the 100Ω impedance of the CAT-5 cable. Cable termination  
and impedance matching require external components.  
SMSC LAN8700/LAN8700i  
Revision 2.3 (04-12-11)  
DATA2S1HEET