MT90870 データシートの表示（PDF） - Zarlink Semiconductor Inc

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MT90870

Flexible 12 k Digital Switch (F12kDX)

Zarlink Semiconductor Inc 

MT90870

Data Sheet

• Constant throughput delay for frame integrity

• Per-channel high impedance output control for Local and Backplane streams

• Per-channel driven-high output control for Local and Backplane streams

• High impedance-control outputs for external drivers on Backplane and Local port

• Per-channel message mode for Local and Backplane output streams

• Connection memory block programming for fast device initialization

• Automatic selection between ST-BUS and GCI-BUS operation

• Non-multiplexed Motorola microprocessor interface

• BER testing for Local and Backplane ports

• Conforms to the mandatory requirements of the IEEE-1149.1 (JTAG) standard

• Memory Built-In-Self-Test (BIST), controlled via microprocessor registers

• 1.8 V core supply voltage

• 3.3 V I/O supply voltage

• 5 V tolerant inputs, outputs and I/Os

• Per streams subrate switching at 4 bit, 2 bit and 1 bit depending on stream data rate

Applications

• Central Office Switches (Class 5)

• Mediation Switches

• Class-independent switches

• Access Concentrators

• Scalable TDM-Based Architectures

• Digital Loop Carriers

Device Overview

The MT90870 has two data ports, the Backplane and the Local port. The Backplane port has two modes of

operation, either 32 input and 32 output streams operated at 2.048 Mb/s, 4.096 Mb/s, 8.192 Mb/s or 16.384 Mb/s,

in any combination, or 16 input and 16 output streams operated at 32.768 Mb/s. The Local port has 16 input and 16

output streams operated at 2.048 Mb/s, 4.096 Mb/s, 8.192 Mb/s or 16.384 Mb/s, in any combination.

The MT90870 contains two data memory blocks (Backplane and Local) to provide the following switching path

configurations:

• Backplane-to-Local, supporting 8 K x 4 K data switching,

• Local-to-Backplane, supporting 4 K x 8 K data switching,

• Backplane-to-Backplane, supporting 8 K x 8 K data switching.

• Local-to-Local, supporting 4 K x 4 K data switching.

The device contains two connection memory blocks, one for the Backplane output and one for the Local output.

Data to be output on the serial streams may come from either of the data memories (Connection Mode) or directly

from the connection memory contents (Message Mode).

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