描述 Description

The MT90221 device is targeted to systems implementing the ATM FORUM UNI specifications for T1/E1 rates or Inverse Multiplexing for ATM (IMA). In the MT90221 architecture, up to 4 physical and independent T1/E1 streams can be terminated through the utilization of off-the-shelf, traditional T1/E1 framers and LIUs. This allows ATM designers to leverage previous T1/E1 design experience, hardware and software implementation, and to select the best T1/E1 framer for the required application.

特性 Features

? Cost effective, single chip, 4-port ATM IMA and UNI processor

? Up to 4 IMA groups over 4 T1/E1 links can be implemented

? Supports MIXED mode; links not assigned to an IMA group can be used in UNI mode

? Versatile PCM Interface to most popular T1 or E1 framers, reducing development time

? Supports Symmetrical and Asymmetrical Operation

? Supports both Common Transmit Clock (CTC) and Independent Transmit Clock (ITC) clocking modes

? Supports T1 ISDN lines

? Provides UTOPIA Level 2 MPHY Interface (MT90221 device slaved to ATM device)

? Complies with ITU G.804 recommendations for performing cell mapping into T1 and E1 transmission systems

? Provides ATM framing using cell delineation according to the ITU I.432 cell delineation process

? Provides Header Error Control (HEC) verification and generation, error detection, Filler cell filtering (IMA mode) and Idle/ Unassigned cell filtering (UNI mode)

? Provides statistics to support MIB

? Connects to popular asychronous SRAM

? Provides statistics on the number of HEC errors

? 8 bit Microprocessor Interface, compatible with Intel and Motorola

? 3.3V operation / 5V tolerant inputs

? MQFP-208 pin

? JTAG Test support

Applications

? Cost effective single chip solution to implement IMA and UNI links over T1 or E1 in all public or private UNI, NNI and B-ICI applications

? ATM Edge switch IMA and UNI Line Card Design

? Can be used for cost reduction in current applications based on FPGA implementation