m34116 STMicroelectronics, m34116 Datasheet - Page 9

• Manufacturer Part Number: m34116
• Description: Pcm Conference Call And Tone Generation Circuit
• Manufacturer: STMicroelectronics

INSTRUCTION SET
OPERATING MODES
Two different operating mode istructions are available:
M116 Operating Mode:
Sending this operating mode instruction, the device functionality is the same as M116 and M116 instruc-
tion set is selected (refer to the following M116 instruction set for further details).
M34116 Operating Mode:
Sending this operating mode instruction, the M34116 instruction set and functionality are selected
M34116 INSTRUCTION SET.
INSTRUCTION 1: M34116 CHANNEL CONNECTION IN CONFERENCE MODE
Five bytes are needed:
CS
CS
F1– F0 =
CS
E = 1 extra bit
Al3–Al0
AO3–AO0
E = 1 extra bit
F1– F0 = 00 no bit inverted
S: Start bit
Al4–Al0:
Al4 = 1
Al4 = 0
Ol4–AO0:
AO4 = 1
AO4 = 0
0
0
0
0
0
0
0
Control Signal
Control Signal
Control Signal
RD
RD
RD
1
1
1
1
1
1
1
01 even bit inverted
10 odd bit inverted
11 all bit inverted
00 no bit inverted
01 even bit inverted
10 odd bit inverted
11 all bit inverted
Input attenuationor gain ( 15dB)
gain
attenuation
value in dB (0–15)
output attenuation or gain ( 15dB)
gain
attenuation
value in dB (0–15)
C/D
C/D
C/D
1
1
0
0
0
0
1
WR
WR
WR
0
0
0
0
0
0
0
D7
D7
D7
X
X
X
X
X
X
X
D6
D6
D6
PT
E
E
X
X
X
X
Default values after reset:
When S = 1 the conference register is cleared.
S = 1 can be used only when connecting the first
channel to a new conference.
When PT = 1 the sign of the PCM samples is
changed before they are put in conference. This
corresponds to a phase shift of 180 and may be
used to reduce the electrical echo.
Note: Unspecified Data Bus can be either 0’s or 1’s
Note:
Upon reset M116 instruction set is automatically
selected. To switch from the M116 instruction set
the above M34116 operating mode instruction is
necessary. The operating mode instruction, when
necessary, must be sent just after reset.
D5
D5
D5
C5
F1
F1
E = 0
S
X
X
X
PT: Phase toggle conference
P4–P0: Conference number (1–29)
C5–C0: Channel number (0–63)
AO4
Al4
D4
F1– F0 = 11 if MU Law
F1– F0 = 01 if A Law
D4
D4
P4
C4
F0
F0
X
Data Bus
Data Bus
Data Bus
AO3
Al3
D3
D3
D3
P3
C3
0
1
0
AO2
Al2
D2
D2
D2
C2
P2
1
0
1
AO1
Al1
D1
D1
D1
C1
P1
0
0
1
M34116
AO0
D0
D0
D0
Al0
C0
P0
1
1
1
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