m34116 STMicroelectronics, m34116 Datasheet - Page 14

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

M34116
M116 INSTRUCTION SET (continued)
INSTRUCTION 4: OVERFLOW INFORMATION
Two bytes are needed to know the status of all 10 conferences: C/D = 0 reads the first byte (first 8 con-
ferences) and C/D = 1 reads the second byte (the last 2 conferences). A conference is in overflow when
the corresponding bit is high.
Instruction 4 Format
CF10 – CF1: Conference in overflow when high.
nb: as long as RD remains low, the overflow status of the conference selected by C/D can be monitored
INSTRUCTION 5: OPERATING MODE
The single byte needed contains the Extra bit (D6), the format bits F1–F0 (D5–D4) and the opcode
(0101).
The E bit must be E = 1 when the PCM frame contains a number of bit multiple of eight plus on bit (ex.
PCM frame at 1544Kbit/s). Normally E = 0. The bits F1–F0 select the kinds of PCM format byte accord-
ing table 1. After Reset the default values corresponds to F1 = 0, F0 = 1 if A–law is selected and F1 = 1,
F0 = 1 if Mu–law is selected. All channels must be disconnected when the Operating Mode Instruction is
sent. They must remain disconnected for at least two time frames after the instruction was sent.
We recommende to use this instruction right after the RESET (see pin RESET decription).
Instruction 5 Format
E: Extra bit insertion (active when E = 1)
F1 – F0: PCM byte Format selection (see also table 1)
INSTRUCTION 6: STATUS
Three bytes are needed:
1) The first byte contains the number of the channel;
2) The second byte contains the opcode (0110);
3) By a reding cycle you extract from the third byte the information about the operating mode of the
channel (no connection or transparent mode or number of the conference, bits D4–D7); the attenuation
(D2–D3) and noise suppression values (D0–D1) eventually inserted.
This reading cycle must be executed at least one frame after the end of the opcode writing cycle.
Instruction 6 Format
P3–P0: channel mode operation information
14/23
00 = no bit inverted
01 = even bit (B0–B2–B4–B6) inverted
10 = odd bit (B1–B3–B5) inverted
11 = all bit (B0–B1–B2–B3–B4–B5–B6)inverted
0000 = no connection
1111 = transparent mode
1010 – 0001 = conference mode
CS
CS
CS
in real time.
0
0
0
0
0
0
Control Signal
Control Signal
Control Signal
RD
RD
RD
0
0
1
1
1
0
C/D
C/D
C/D
0
1
1
0
1
1
WR
WR
WR
1
1
0
0
0
1
CF8
D7
D7
D7
P3
X
X
X
X
CF7
D6
D6
D6
P2
X
E
X
X
nb: the instruction 6 enables the dat bus to read
the status until reset by C/D = 0 and WR = 1.
CF6
D5
D5
D5
P1
F1
X
X
X
P3–P0 give the number of the conferenc
CF5
D4
D4
D4
C4
P0
F0
X
X
Data Bus
Data Bus
Data Bus
CF4
D3
D3
D3
C3
A1
X
0
0
CF3
D2
D2
D2
C2
A0
X
1
1
CF10
CF2
D1
D1
D1
C1
T1
0
1
CF1
CF9
D0
D0
D0
C0
T0
1
0