DS33Z44 Datasheet, PDF (1/181 Pages) Maxim Integrated Products – Quad Ethernet Mapper

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GENERAL DESCRIPTION
The DS33Z44 extends four 10/100 Ethernet LAN
segments by encapsulating MAC frames in HDLC or
X.86 (LAPS) for transmission over four PDH/TDM
data streams. The serial links support bidirectional
synchronous interconnect up to 52Mbps over xDSL,
T1/E1/J1, T3/E3, V.35/Optical, OC-1/EC-1, or
SONET/SDH Tributary.
The device performs store-and-forward of packets
with full wire-speed transport capability. The built-in
Committed Information Rate (CIR) controllers
provide fractional bandwidth allocation up to the line
rate in increments of 512kbps. The DS33Z44 can
operate with an inexpensive external processor,
EEPROM or in a stand-alone hardware mode.
APPLICATIONS
Transparent LAN Service
LAN Extension
Ethernet Delivery Over T1/E1/J1, T3/E3,
OC-1/EC-1, G.SHDSL, or HDSL2/4
FUNCTIONAL DIAGRAM
4 SERIAL
PORTS
DS33Z44
TRANSCEIVERS/
SERIAL DRIVERS
BERT
HDLC/X.86
MAPPER
CONFIG.
LOADER
PROM
OR mC
SDRAM
DS33Z44
Quad Ethernet Mapper
FEATURES
§ Four 10/100 IEEE 802.3 Ethernet MACs (MII and
RMII) Half/Full Duplex with Automatic Flow
Control
§ Four 52Mbps Synchronous TDM Serial Ports
with independent transmit and receive timing.
§ HDLC/LAPS Encapsulation with Programmable
FCS and Interframe Fill
§ Committed Information Rate Controllers Provide
Fractional Allocations in 512kbps Increments
§ Programmable BERT for Serial (TDM) Interfaces
§ External 16MB, 100MHz SDRAM Buffering
§ Parallel Microprocessor Interface
§ SPI Interface and Hardware Mode for Operation
Without a Host Processor
§ 1.8V Operation with 3.3V Tolerant I/O
§ IEEE 1149.1 JTAG Support
Features Continued on Page 10.
ORDERING INFORMATION
PART
TEMP RANGE PIN-PACKAGE
DS33Z44
-40°C to +85°C 256 CSBGA
Go to www.maxim-ic.com/telecom for a complete list of
Telecommunications data sheets, evaluation kits, application
notes, and software downloads.
4 10/100
MACs
4 MII/RMII
4 10/100
ETHERNET
PHYs
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
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