MT9122 Zarlink Semiconductor, MT9122 Datasheet - Page 14

• Manufacturer Part Number: MT9122
• Description: Dual Voice Echo CANceller (ITU-T G165 Compliant) With Disable Tone Detection
• Manufacturer: Zarlink Semiconductor

MT9122
14
ST-BUS Mode 3 supports connection to 2B+D devices where timeslots 0 and 1 transport D and C channels and both
echo canceller I/O channels are assigned to ST-BUS timeslots 2 and 3. Both PORT1 and PORT2 must be configured in
ST-BUS Mode 3.
ST-BUS Mode 4 allows 16 bits 2’s complement linear data to be transferred using ST-BUS I/O timing. Note that PORT1
and PORT2 need not necessarily both be in mode 4.
PORT2
C4i
F0i
F0od
Rin
PORT1
Sout
Sin
PORT2
Rout
F0i
F0od
Sin
Rout
C4i
Rin
Sout
PORT1
outputs=High impedance
outputs=High impedance
indicates that an input channel is bypassed to an output channel
inputs = don’t care
inputs = don’t care
Figure 7 - ST-BUS 8 Bit Companded PCM I/O with D and C channels (Mode 3)
S S S 12 11 10 9 8
S S S 12 11 10 9 8
S S S 12 11 10 9 8
S S S 12 11 10 9 8
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
Figure 8 - ST-BUS 16 Bit 2’s complement linear PCM I/O (Mode 4)
0
ECA
ECA
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
1
S S S 12 11 10 9 8
S S S 12 11 10 9 8
S S S 12 11 10 9 8
S S S 12 11 10 9 8
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
ECA
ECA
2
ECB
ECB
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
ECB
ECB
3
Data Sheet
4