KSZ8721SL-TR Datasheet, PDF (1/33 Pages) Micrel Semiconductor – 3.3V Single Power Supply 10/100BASE-TX/FX MII Physical Layer Transceiver

KS8721BL/SL
Micrel
KS8721BL/SL
3.3V Single Power Supply 10/100BASE-TX/FX MII Physical Layer Transceiver
Rev. 1.1
General Description
Operating with a 2.5V core to meet low-voltage and low-
power requirements, the KS8721BL and KS8721SL are
10BASE-T/100BASE-TX/FX Physical Layer Transceivers
that use MII and RMII interfaces to transmit and receive data.
They contain 10BASE-T Physical Medium Attachment (PMA),
Physical Medium Dependent (PMD), and Physical Coding
Sub-layer (PCS) functions. The KS8721BL/SL also have 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 KS8721BL/SL automatically configures itself for 100 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 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
Functional Diagram
TX+
Transmitter
TX-
10/100
Pulse
Shaper
Adaptive EQ
RX+
Base Line
Wander Correction
RX-
MLT3 Decoder
NRZI/NRZ
10BASE-T
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
COL
FDX
SPD
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
May 2004
1
M9999-051704