Preliminary Information

MT8924

8-9

S:

Conference Start Bit

T1-T0:

Channel Noise Suppression

P3-P0:

Conference Number (1-10)

T1/T0

A-Law

µ-Law

IT:

Insertion Tone Function Enable (IT=1)

00

no noise suppression

C4-C0:

Channel Number (0-31)

01

9/4096

9/8159

A1-A0:

Channel Attenuation

10

16/4096

16/8159

00 = -0dB

11

32/4096

32/8159

01 = -3dB

10 = -6dB

T1-T0: see noise suppression description given for Instruction 1

CF10 - CF1 : Conference is in overflow when bit is HIGH

Note : as long as RD remains LOW, the overflow status of the conference selected by C/D can be monitored in real time

Instruction 1 : Channel Connection in Conference Mode

Control Signals

Data Bus

Comments

CS

RD

C/D

WR

D7

D6

D5

D4

D3

D2

D1

D0

0100

XXXS

P3

P2

P1

P0

Conference Number

0100

X

X

IT

C4

C3

C2

C1

C0

PCM Channel Number and

Insertion Tone control

0110

A1

A0

T1

T0

0111

Opcode, Attenuation, and

Noise Suppression control

Instruction 2 : Channel Connection in Transparent Mode

Control Signals

Data Bus

Comments

CS

RD

C/D

WR

D7

D6

D5

D4

D3

D2

D1

D0

0100

X

X

X

C4

C3

C2

C1

C0

PCM Channel Number

0110

A1

A0

T1

T0

0011

Opcode and Attenuation

Instruction 3 : Channel Disconnection

Control Signals

Data Bus

Comments

CS

RD

C/D

WR

D7

D6

D5

D4

D3

D2

D1

D0

0100

X

X

X

C4

C3

C2

C1

C0

PCM Channel Number

0110

XXXX

1111

Opcode

Instruction 4: Overflow Status Monitoring

Control Signals

Data Bus

Comments

CS

RD

C/D

WR

D7

D6

D5

D4

D3

D2

D1

D0

0001

CF

8

CF

7

CF

6

CF

5

CF

4

CF

3

CF

2

CF

1

Conferences 1 to 8

0011

XXXXXX

CF

10

CF

9

Conferences 9 to 10