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KS8721BT

更新时间: 2024-11-14 03:48:43
品牌 Logo 应用领域
麦瑞 - MICREL 电信集成电路局域网(LAN)标准以太网:16GBASE-T
页数 文件大小 规格书
32页 201K
描述
2.5V 10/100BasTX/FX MII Physical Layer Transceiver

KS8721BT 数据手册

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KS8721B/BT  
2.5V 10/100BasTX/FX MII Physical Layer Transceiver  
Rev. 2.2  
General Description  
Features  
Operating at 2.5 volts to meet low voltage and low power  
requirements, the KS8721B/BT is a 10BaseT/100BaseTX/  
FX Physical Layer Transceiver, which provides an MII to  
transmit and receive data. It contains the 10BaseT Physical  
Medium Attachment (PMA), Physical Medium Dependent  
(PMD), and Physical Coding Sub-layer (PCS) functions.  
Moreover, the KS8721B/BT has on-chip 10BaseT output  
filtering, which eliminates the need for external filters and  
allows a single set of line magnetics to be used to meet  
requirements for both 100BaseTX and 10BaseT.  
• Single chip 100BaseTX/100BaseFX/10BaseT physical  
layer solution  
• 2.5V CMOS design, power consumption <200mW  
(excluding output driver current )  
• Fully compliant to IEEE 802.3u standard  
• Supports Media Independent Interface (MII) and  
Reduced MII (RMII)  
• Supports 10BaseT, 100BaseTX and 100BaseFX with  
Far_End_Fault Detection  
• Supports power down mode and power saving mode  
• Configurable through MII serial management ports or via  
external control pins  
• Supports auto-negotiation and manual selection for  
10/100Mbps speed and full/half-duplex mode  
• On-chip built-in analog front end filtering for both  
100BaseTX and 10BaseT  
TheKS8721B/BTcanautomaticallyconfigureitselffor100or  
10Mbpsandfullorhalfduplexoperation, usingon-chipAuto-  
Negotiation algorithm. It is an ideal choice of physical layer  
transceiver for 100BaseTX/10BaseT applications.  
Data sheets and support documentation can be found on  
Micrel’s web site at www.micrel.com.  
Functional Diagram  
4B/5B Encoder  
NRZ/NRZI  
MLT3 Encoder  
TXD3  
TXD2  
TXD1  
TXD0  
TXER  
TXC  
Scrambler  
10/100  
Pulse  
Shaper  
TX+  
TX-  
Parallel/Serial  
Transmitter  
Parallel/Serial  
Manchester Encoder  
TXEN  
CRS  
COL  
MII/RMII  
Registers  
and  
Controller  
Interface  
Adaptive EQ  
RX+  
RX-  
Base Line  
Wander Correction  
MLT3 Decoder  
NRZI/NRZ  
4B/5B Decoder  
Descrambler  
Clock  
Recovery  
MDIO  
MDC  
RXD3  
RXD2  
RXD1  
RXD0  
RXER  
RXDV  
RXC  
Serial/Parallel  
Auto  
Negotiation  
10BaseT  
Receiver  
Manchester Decoder  
Serial/Parallel  
Power  
Down or  
Saving  
LINK  
COL  
FDX  
SPD  
LED  
Driver  
XI  
PLL  
XO  
PWRDWN  
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com  
August 2003  
1
KS8721B/BT  

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