PEB2447 データシートの表示（PDF） - Infineon Technologies

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PEB2447

Memory Time Switch Extended Large MTSXL

Infineon Technologies 

PEB 2447

Functional Description

2

Functional Description

The MTSXL is a memory time switch device. Operating with a device clock of

16.384 MHz it can connect any of 2048 PCM input channels to any of 2048 output

channels.

A general block diagram of the MTSXL is shown in figure 3.

2.1 General Operation

The input information of a complete frame is stored twice in the two on-chip 16-kbit data

memories DM 0 and DM 1 (Data Memory 0 and Data Memory 1). The incoming

2048 channels of 8 bits each are written in sequence into fixed positions of DM 0 and

DM 1. This is controlled by the input counter in the timing control block with a 8 kHz

repetition rate.

For outputting, two connection memories (CM 0 and CM 1) are read in sequence

synchronously. Each entry in the connection memory CM 0 / CM 1 points to a location

in data memory DM 0 / DM 1. The byte in this data memory location is transferred into

the current output time slot. The read access to the CM’s is controlled by an output

counter. CM 0 supplies the PCM data for outputs OUT0 to OUT15, CM 1 supplies the

PCM data for outputs OUT16 to OUT31.

Semiconductor Group

11

03.97

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