DM9301FP
100Mbps Ethernet Fiber/Twisted Pair Single Chip Media Converter
General Description
The DM9301FP 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 DM9301FP 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 DM9301FP provides two independent clock
recovery circuits to minimize bit delay through the
converter (no FIFO is 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 DM9301FP 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
25M FXRXCLK
125M FXRXCLK
Link Status
Monitor &
LED Driver
Rise/Fall
Time
CTL
PECLRXI +/-
PECL
RCVR
RX
CRM
NRZI
to
NRZ
Serial to
Parallel
Scrambler
Parallel
to Serial
NRZ
to
NRZI
NRZI to
MLT-3
MLT-3
Driver
TPTXO+/-
TX Code-
group
Alignment
Monitor
25M
OSC/XTAL
CGM
FX Code-
group
Alignment
Monitor
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
TPRXI+/-
Final
Version: DM9301FP-DS-F03
June 06, 2007
1
DAVICOM [ DAVICOM SEMICONDUCTOR, INC. ]
