KS8721CL 查看數據表（PDF） - Micrel
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KS8721CL Datasheet PDF : 33 Pages
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KS8721CL
KS8721CL
Micrel, Inc.
3.3V Single Power Supply 10/100BASE-TX/FX MII Physical Layer Transceiver
Rev. 1.2
General Description
The KS8721CL is a 10BASE-T, 100BASE-TX, and 100BASE-
FX physical layer transceiver providing MII/RMII interfaces to
MACs and switches. Using a unique mixed-signal design that
extends signaling distance while reducing power consump-
tion, the KS8721CL represents Micrel’s fourth generation
single-port Fast Ethernet PHY.
The KS8721CL contains 10BASE-T physical medium attach-
ment (PMA), physical medium dependent (PMD), and physi-
cal coding sub-layer (PCS) functions. It also has on-chip
10BASE-T output filtering. This eliminates the need for
external filters and allows a single set of line magnetics to be
used to meet requirements for both 100BASE-TX and
10BASE-T.
The KS8721CL automatically configures itself for 100Mbps
or 10Mbps and full- or half-duplex operation, using an on-chip
auto-negotiation algorithm. It is the ideal physical layer
transceiver for 100BASE-TX/10BASE-T applications.
Features
• Single chip 100BASE-TX/100BASE-FX/10BASE-T
physical layer solution
• 2.5V CMOS design; 2.5/3.3V tolerance on I/O
• 3.3V single power supply with built-in voltage regulator;
Power consumption <340mW (including output driver
current)
• Fully compliant to IEEE 802.3u standard
• Supports MII and Reduced MII (RMII)
• Supports 10BASE-T, 100BASE-TX, and 100BASE-FX
with far-end-fault (FEF) detection
• Supports power-down and power-saving modes
• 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 modes
• On-chip, built-in, analog front-end filtering for both
100BASE-TX and 10BASE-T
• Available in Lead-free and Industrial Temperature
packages.
Functional Diagram
TX+
Transmitter
TX-
10/100
Pulse
Shaper
Adaptive EQ
RX+
Base Line
Wander Correction
RX-
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
TXD3
TXD2
TXD1
TXD0
TXER
TXC
TXEN
CRS
COL
MDIO
MDC
RXD3
RXD2
RXD1
RXD0
RXER
RXDV
RXC
LED
Driver
LINK
ACTIVITY
FDX
SPD
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
April 2005
1
M9999-041405
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