M34116

PCM CONFERENCE CALL

AND TONE GENERATION CIRCUIT

PRELIMINARY DATA

HW AND SW COMPATIBLE WITH M116

1 TO 64 SERIAL CHANNELS PER FRAME

(CONTROLLED BY SYNC SIGNAL PERIOD)

29 MAXIMUM CONFERENCES

1 TO 64 SERIAL CHANNELS PER CONFER-

ENCES

3

SIMULTANEOUS OPERATION MODES

AVAILABLE:

CONFERENCE, TRANSPARENT AND TONE

GENERATION

TYPICAL BIT RATES:

1536/1544/2048/4096Kbits/s

COMPATIBLE WITH ALL KINDS OF PCM

FORMAT

µ AND A LAW (PIN PROGRAMMABLE)

EQUAL PRIORITY TO EVERY CHANNEL

ONE FRAME AND ONE CHANNEL DELAY

FROM SENDING TO RECEIVING

OVERFLOW INFORMATION FOR EACH CON-

FERENCE BY PIN OS (OVERFLOW SIGNAL-

LING) AND ON DATA BUS ON MPU RE-

QUEST

INSTRUCTION SET COMPATIBLE WITH M3488

PROGRAMMABLE INPUT AND OUTPUT AT-

TENUATION OR GAIN FROM 0 TO 15dB

WITH STEP OF 1dB FOR EACH CHANNEL

TONE

GENERATION

FROM

3.9Hz

TO

3938Hz WITH MIN. STEP OF 3.9Hz

TOTAL OF 7 DIFFERENT TONE OUTPUTS

IN PARALLEL PROGRAMMABLE VIA MPU

(MAXIMUM 4 DIFFERENT FREQUENCIES

AND DURATIONS)

1 MELODY OF MAXIMUM 32 PROGRAMMA-

BLE FREQUENCIES AND DURATIONS

5V POWER SUPPLY

TTL

COMPATIBLE

INPUT

LEVELS,

CMOS/TTL COMPATIBLE OUTPUT LEVELS

MAIN INSTRUCTIONS CONTROLLED BY MI-

CROPROCESSOR INTERFACE:

– Channel connection to a conference

– Channel attenuation or gain

– Channel disconnection from both conference

and transparent modes

– Tone and melody generation

– Overflow status

– Operating mode

– Channel status

DESCRIPTION

The M34116 is a product specifically designed for

applications in PCM digital exchanges. It is able

to handle up to 64 channels in any conferences

combination from 1 to 29 conferences in parallel

and to generate seven different tones and one

melody.

The parties in a conference must previously be al-

located through the Digital Switching Matrix

(M3488) in a single serial wire at M34116 PCM

input (IN PCM pin).

The M34116 is full pin and function compatible

with the M116. In addition, it has the capability to

generate tone directly coded in PCM.

For the conference function, each channel is con-

verted inside the chip from PCM law to linear law

(14 bits). Then it is added to its conference, and

the sample of the previous frame is subtracted

from the conference.

In this way a new conference sum signal is gener-

ated.

The channel output signal will contain the infor-

mation of all the other channels in its conference

except its own.

After the PCM encoding, the data is serialized by

the M34116 in the same sequence as the PCM

input frame, with one frame (plus one channel)

delay and will be reallocated by the DSM (M3488)

at the final channel and bus position.

A programmable attenuation or gain can be set

on each channel and for every function: confer-

ence, tone generation and transparent mode.

This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

January 1995

DIP24

ORDERING NUMBER: M34116B1

PLCC28

ORDERING NUMBER: M34116C1

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