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.
W
D _ E N
2
0 0 0 m s
W D _ I N T
5
m
s
5 m s
2
4 4 m s
2
0 0 0 m s
2
0
0
0
m
s
2 0 0 0 m s
W
D _ R S T
D R - 0 1 1 1 9
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
CYCLE_LO Tone Block. (from 1 to 511)
The Silence sample to be used during
Identifies the number of samples in the
SILENCE
INTR
8
cadence period 1 and 3.
16
INTR_HI
INTR_LO
The divisor used to generate the
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.
9
sa me s
SAMES [ SAMES ]
