KS8721B(2003) データシートの表示（PDF） - Micrel
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KS8721B Datasheet PDF : 32 Pages
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KS8721B/BT
Micrel
KS8721B/BT
2.5V 10/100BasTX/FX MII Physical Layer Transceiver
Rev. 2.2
General Description
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.
The KS8721B/BT can automatically configure itself for 100 or
10 Mbps and full or half duplex operation, using on-chip Auto-
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.
Features
• 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
Functional Diagram
TX+
Transmitter
TX-
10/100
Pulse
Shaper
RX+
RX-
Adaptive EQ
Base Line
Wander Correction
MLT3 Decoder
NRZI/NRZ
10BaseT
Receiver
XI
PLL
XO
NRZ/NRZI
MLT3 Encoder
Clock
Recovery
Auto
Negotiation
Power
Down or
Saving
PWRDWN
4B/5B Encoder
Scrambler
Parallel/Serial
Parallel/Serial
Manchester Encoder
4B/5B Decoder
Descrambler
Serial/Parallel
Manchester Decoder
Serial/Parallel
MII/RMII
Registers
and
Controller
Interface
LED
Driver
TXD3
TXD2
TXD1
TXD0
TXER
TXC
TXEN
CRS
COL
MDIO
MDC
RXD3
RXD2
RXD1
RXD0
RXER
RXDV
RXC
LINK
COL
FDX
SPD
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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