SA9401 Ver la hoja de datos (PDF) - South African Micro Electronic Systems

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componentes Descripción

Fabricante

SA9401

UNIVERSAL PABX TONE GENERATOR

South African Micro Electronic Systems 

SA9401

The EPROM contents can be divided into two distinct sections. The smaller section

contains eight Programs, each of which would typically describe all the tones required

by a PABX used in a single country. Thus a single EPROM can be programmed to

cover up to eight different countries requirements.

The larger part of the EPROM is occupied by the sets of PCM samples which make up

the basic waveforms to be used by the SA9401 in creating the familiar supervisory

tones. Each of 16 waveforms can contain up to 511 samples of A or µ law samples.

WD_EN

WD_INT

WD_RST

DR-01119

2000ms

5ms

2000ms

5ms

2000ms

2000ms

244ms

Program

A single Program comprises one set of Initialisation Data, 8 PCM Tone Streams with

the associated Cadence, Timeslot and Waveform and one Intrude Tone with its asso-

ciated Cadence. Each individual variable is described below.

Initialisation

The Initialisation data describes parameters common to all the tones in a given plan.

Variable

CYCLE

SILENCE

INTR

bits Composition Description

9

CYCLE_HI Identifies the number of samples in the

CYCLE_LO Tone Block. (from 1 to 511)

8

The Silence sample to be used during

cadence period 1 and 3.

16

INTR_HI The divisor used to generate the

INTR_LO Intrude Tone Frequency.

PCM Tone Stream

The Tone Stream Data describes the characteristics of a specific PCM Tone. Note that

the length of the Cadence periods are defined in multiples of 5ms.

sames

9

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