sames

SA9401

9

5ms

2000ms

WD_EN

WD_INT

WD_RST

244ms

2000ms

5ms

2000ms

2000ms

DR-01119

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.

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

bits

Composition

Description

CYCLE

9

CYCLE_HI

Identifies the number of samples in the

CYCLE_LO

Tone Block. (from 1 to 511)

SILENCE

8

The Silence sample to be used during

cadence period 1 and 3.

INTR

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.