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: 27/76页
文件大小: 1004K
代理商: WBLXT975BHCA8
Fast Ethernet 10/100 Quad Transceivers — LXT974/LXT975
Datasheet
33
2.5.3
100BASE-X Protocol Sublayer Operations
With respect to the 7-layer communications model, the LXT974/975 is a Physical Layer 1 (PHY)
device. The LXT974/975 implements the Physical Coding Sublayer (PCS), Physical Medium
Attachment (PMA), and Physical Medium Dependent (PMD) sublayers of the reference model
defined by the IEEE 802.3u specification. The following paragraphs discuss LXT974/975
operation from the reference model point of view.
2.5.4
PCS Sublayer
The Physical Coding Sublayer (PCS) provides the MII interface, as well as the 4B/5B encoding/
decoding function.
For 100TX and 100FX operation, the PCS layer provides IDLE symbols to the PMD-layer line
driver as long as TX_EN is de-asserted.
For 10T operation, the PCS layer merely provides a bus interface and serialization/de-serialization
function. 10T operation does not use the 4B/5B encoder.
2.5.4.1
Preamble Handling
When the MAC asserts TX_EN, the PCS substitutes a /J/K symbol pair, also known as the Start of
Stream Delimiter (SSD), for the first two nibbles received across the MII. The PCS layer continues
to encode the remaining MII data, following Table 19 on page 32, until TX_EN is de-asserted. It
then returns to supplying IDLE symbols to the line driver.
In the receive direction, the PCS layer performs the opposite function, substituting two preamble
nibbles for the SSD.
Figure 15. LXT974/975 Protocol Sublayers
Encoder/Decoder
Serializer/De-serializer
Link/Carrier Detect
PCS
Sublayer
PMA
Sublayer
MII Interface
PECL Interface
Fiber Transceiver
LXT974
100BASE-TX
100BASE-FX
Scrambler/
De-scrambler
PMD
Sublayer
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
相关代理商/技术参数
参数描述
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)