DM9301F Datasheet, PDF (1/2 Pages) Davicom Semiconductor, Inc. – 100Mbps Ethernet Fiber/Twisted Pair Single Chip Media Converter

DM9301F Product Brief
100Mbps Ethernet Fiber/Twisted Pair Single Chip Media Converter
June 2008 Rev.1.0
The DM9301 is a physical-layer, single-chip, low-power media converter for
100BASE-TX/FX full duplex repeater applications. On the TX media side, it provides
a direct interface to Unshielded Twisted Pair Cable 5 (UTP5) for 100BASE-TX Fast
Ethernet. On the FX media side, it provides a direct interface to a Pseudo Emitter
Coupled Logic level interface (PECL).
The DM9301 uses a low power and high performance CMOS process. It contains the
entire physical layer functions of 100BASE-TX as defined by IEEE802.3u, including
the Physical Coding Sublayer (PCS), Physical Medium Attachment (PMA), Twisted
Pair Physical Medium Dependent Sublayer (TP-PMD) and a PECL compliant
interface for a fiber optic module, compliant with ANSI X3.166. The DM9301
provides two independent clock recovery circuits to minimize bit delay through the
converter (no FIFO are used to buffer data between the FX and TX interfaces).
Furthermore, due to the excellent rise/fall time control by a built-in wave-shaping
filter, the DM9301 needs no external filter to transport signals to the media on the
100Base-TX interface.
Patent-Pending Circuits: Smart adaptive receiver equalizer
‧ Digital algorithm for high frequency clock/data recovery circuit
‧ High speed wave-shaping circuit
Block Diagram
PECLSD
FXSD
RCVR
Link Status
Monitor &
LED Driver
25M FXRXCLK
125M FXRXCLK
Rise/Fall
Time
CTL
PECLRXI +/-
PECL
RCVR
25M
OSC/XTAL
RX
CRM
NRZI
to
NRZ
CGM
Serial to
Parallel
TX Code-
group
Alignment
Monitor
Scrambler
FX Code-
group
Alignment
Monitor
Parallel
to Serial
NRZ
to
NRZI
NRZI to
MLT-3
MLT-3
Driver
25M TPRXCLK
125M TPRXCLK
PECLTXO +/-
PECL
TXMT
NRZ
to
NRZI
Parallel
to Serial
Descrambler
Serial to
Parallel
NRZI
to
NRZ
RX
CRM
MLT-3 to
NRZI
Adaptive
EQ
TPTXO+/-
TPRXI+/-