August 2003 1 KS8737
KS8737 Micrel
KS8737
3.3V 10/100BaseTX/FX MII Physical Layer Transceiver
Rev 3.11
General Description
Operating at 3.3 Volts to meet low voltage and low power
requirement, the KS8737 is a 10/100BaseTX/FX Physical
Layer Transceiver which provides MII interface to transmit
and receive data. It contains the 100BaseTX/FX Physical
Medium Attachment (PMA), Physical Medium Dependent
(PMD), and Physical Coding Sub-layer (PCS) functions.
Moreover, the KS8737 has on-chip 10BaseT encoder/de-
coder and output filtering, which eliminates the need for
external filters and makes possible a single set of line
magnetics to be used to meet requirement for both 100BaseTX/
FX and 10BaseT.
The KS8737 can automatically configure itself for 100 or 10
Mbps and full or half duplex operation, using on-chip Auto-
Negotiation algorithm. It’s an ideal choice of physical layer
transceiver for 100BaseTX/100BaseFX/10BaseT applica-
tions.
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
• 3.3V CMOS design, 70mA operating current (excluding
transmit output driver current)
• Fully compliant to IEEE 802.3u standard
• Support Media Independent Interface (MII) mode
• Support 10BaseT, 100BaseTX and 100BaseFX Fiber
Channel with Far_End_Fault Detection
• Support power down mode and power saving mode
• Configurable through MII serial management ports or via
external control pins
• Support auto-negotiation and manual selection for
10Mbps or 100Mbps speed
• Support auto-negotiation and manual selection for full-
and half-duplex mode
• Standard CSMA/CD or full-duplex operation at 10Mbps
or 100Mbps
• On-chip built-in filtering for both 100BaseTX and
10BaseT
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
Functional Diagram
10/100
Pulse
Shaper
NRZ/NRZI
MLT3 Encoder
Parallel/Serial
Manchester Encoder
4B/5B Encoder
Scrambler
Parallel/Serial
Transmitter
TXP
TXM
Adaptive EQ
Base Line
Wander Correction
MLT3 Decoder
NRZI/NRZ
Clock
Recovery
4B/5B Decoder
Descrambler
Serial/Parallel
Auto
Negotiation
10BaseT
Receiver
Manchester Decoder
Serial/Parallel
PLL
LED
Driver
MII
Registers
and
Controller
Interface
RXM
RXP
X1
X2
SPD
FDX
COL
ACT
LINK
Power
Down or
Saving
PWRDWN
RXC
TXD3
TXD0
TXD1
TXD2
RXD3
TXEN
TXC
TXER
MDC
MDIO
COL
CRS
RXER
RXD0
RXD1
RXD2
RXDV
PWRSAVE
FIBIP
FIBIM
FXMODEB
