参数资料
型号: WBLXT975BHCA8
厂商: CORTINA SYSTEMS INC
元件分类: 网络接口
英文描述: DATACOM, ETHERNET TRANSCEIVER, PQFP160
封装: ROHS COMPLIANT, PLASTIC, MS-002DD-1, HQFP-160
文件页数: 24/76页
文件大小: 1004K
代理商: WBLXT975BHCA8
LXT974/LXT975 — Fast Ethernet 10/100 Quad Transceivers
30
Datasheet
2.5
100 Mbps Operation
2.5.1
100BASE-X MII Operations
The LXT974/975 encodes and scrambles the data sent by the MAC, and then transmits it using
MLT3 signaling. The LXT974/975 descrambles and decodes MLT3 data received from the
network.
When the MAC is not actively transmitting data, the LXT974/975 sends out Idle symbols.
The 100BASE-X protocol specifies the use of a 5-bit symbol code on the network media.
However, data is normally transmitted across the MII interface in 4-bit nibbles. The LXT974/975
incorporates a 4B/5B encoder/decoder circuit that translates 4-bit nibbles from the MII into 5-bit
symbols for the 100BASE-X connection, and translates 5-bit symbols from the 100BASE-X
connection into 4-bit nibbles for the MII. Table 12 shows the data conversion flow from nibbles to
symbols. Table 19 on page 32 shows 4B/5B symbol coding (not all symbols are valid).
2.5.2
100BASE-X Network Operations
During 100BASE-X operation, the LXT974/975 transmits and receives 5-bit symbols across the
network link. Figure 14 shows the structure of a standard frame packet. When the MAC is not
actively transmitting data, the LXT974/975 sends out Idle symbols on the line.
In 100TX mode, the LXT974/975 scrambles the data and transmits it to the network using MLT-3
line code. The MLT-3 signals received from the network are descrambled and decoded and sent
across the MII to the MAC.
Figure 12. LXT974/975 Auto-Negotiation Operation
Check Value
0.12
Start
Done
Enable
Auto-Neg/Parallel Detection
Go To Forced
Settings
Attempt Auto-
Negotiation
Listen for 10T
Link Pulses
Listen for 100TX
Idle Symbols
Link Set
NO
YES
Power-Up, Reset,
Link Failure
Disable
Auto-Negotiation
0.12 = 0
0.12 = 1
相关PDF资料
PDF描述
WBLXT974BHCA8 DATACOM, ETHERNET TRANSCEIVER, PQFP160
WBLXT974BHCA8 DATACOM, ETHERNET TRANSCEIVER, PQFP160
WBLXT9785EHC.C2V DATACOM, INTERFACE CIRCUIT, PQFP208
WBLXT9785EHC.D0-865110 DATACOM, INTERFACE CIRCUIT, PQFP208
WBLXT9785EHC.D0-865111 DATACOM, INTERFACE CIRCUIT, PQFP208
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WBLXT9785EHC.D0865110 功能描述:IC TXRX 8PORT ETHERNET 208-HQFP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器,接收器,收发器 系列:- 标准包装:1,000 系列:- 类型:收发器 驱动器/接收器数:2/2 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-SOIC(0.295",7.50mm 宽) 供应商设备封装:16-SOIC 包装:带卷 (TR)
WBLXT9785EHC.D0-865110 制造商:Cortina Systems Inc 功能描述:PHY 8-CH 10Mbps/100Mbps 208-Pin PQFP
WBLXT9785EHC.D0-865111 制造商:Cortina Systems Inc 功能描述:PHY 8-CH 10Mbps/100Mbps 208-Pin PQFP
WBLXT9785HC.D0 功能描述:IC TXRX 8PORT ETHERNET 208-HQFP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器,接收器,收发器 系列:- 标准包装:1,000 系列:- 类型:收发器 驱动器/接收器数:2/2 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-SOIC(0.295",7.50mm 宽) 供应商设备封装:16-SOIC 包装:带卷 (TR)
WBLXT9785HC.D0-865112 功能描述:TXRX ETH OCT LP COMM 208-HQFP 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)