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78Q2120-64CGT Datasheet

  • 78Q2120-64CGT

  • 10/100BASE-TX Ethernet Transceiver

  • 33頁

  • ETC

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78Q2120
10/100BASE-TX
Ethernet Transceiver
April 2000
DESCRIPTION
The 78Q2120 is a 10BASE-T/100BASE-TX Fast
Ethernet transceiver. It includes integrated MII,
ENDECs, scrambler/descrambler, dual-speed clock
recovery,
and
full-featured
auto-negotiation
functions. The transmitter includes an on-chip pulse-
shaper and a low-power line driver. The receiver has
an adaptive equalizer and a baseline restoration
circuit required for accurate clock and data recovery.
The transceiver interfaces to Category-5 unshielded
twisted pair (Cat-5 UTP) cabling, and is connected to
the line media via 1:1 isolation transformers. No
external filter is required. Interface to the MAC is
accomplished through an IEEE-802.3 compliant
media independent interface (MII). The product is
fabricated in a BiCMOS process for high
performance and low power operation, and can
operate from a single 3.3 V or 5 V supply.
FEATURES
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10BASE-T/100BASE-TX IEEE-802.3 compliant TX
and RX functions requiring a dual 1:1 isolation
transformer interface to the line
Integrated MII, 10BASE-T/100BASE-TX ENDEC,
100BASE-TX scrambler/descrambler, and full-
featured auto-negotiation function
Full duplex operation capable
PCS Bypass supports 5-bit symbol interface
Dual speed clock recovery
Automatic polarity correction during auto-
negotiation and 10BASE-T signal reception
Power-saving and power-down modes including
transmitter disable
BiCMOS technology, operates with a single 3.3V or
5V supply
LED indicators: LINK,TX,RX,COL,100,10,FDX
User programmable Interrupt pin
General Purpose I/O Interface (80-pin package
only)
64 and 80-Lead TQFP (JEDEC LQFP),
64-Pin QFP packages
BLOCK DIAGRAM
100M
4B/5B Encoder,
Scrambler,
Parallel/Serial
NRZ/NRZI,
MTL3 Encoder
Pulse Shaper
& Filter
TX Clock
Generator
UTP
Drivers
TXOP
TXON
Transmit
MII
Registers
&
MII Serial
Management
& Control
Interface
Logic
10M
Parallel/Serial,
Manchester Encoder
Carrier Sense,
Collision Detect
Auto
Negotiation
Manchester Decoder,
Serial/Parallel
Clock
Recovery
10M
Adaptive EQ,
Baseline Wander Corrector,
MLT3 Decoder,
NRZI/NRZ
UTP
Receiver
100M
LEDs
LINK
TX
RX
COL
100BT
10BT
FDX
RXIP
RXIN
Receive
Serial/Parallel,
Descrambler,
5B/4B Decoder
Clock
Reference
CKIN
Vcc
Ground

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