MT9161 Zarlink Semiconductor, MT9161 Datasheet - Page 14

• Manufacturer Part Number: MT9161
• Description: 5 V Multi-featured Phone Codec With Programmable U/a Law Companding
• Manufacturer: Zarlink Semiconductor

Advance Information
Note: Bits marked "-" are reser v ed bits and should be written with logic "0"
Dout
D-Channel Register
Loopback Register
C-Channel Register
PCM/ANALOG This control bit functions only when loopen is set high. It is ignored when loopen is low.
loopen
D7-D0
Micro-port access to the ST-BUS C-Channel information read and write
PCM/ANALOG = 0
Data written to this register will be transmitted every frame, in channel 0, if the DEn control bit is set (address 04h).
Din is looped back to Dout without conversion to the analog domain. However, the receive D/A path (from Din to
HSPKR ) still functions. When low, the device is configured for analog-to-analog operation. An analog input signal at
M is looped back to the SPKR outputs through the A/D and D/A circuits as well as through the normal transmit A/D
path (from M to Dout).
When low, loopbacks are disabled, the device operates normally and the PCM/ANALOG bit is ignored.
Received D-Channel data is valid, regardless of the state of DEn. These bits are valid for ST-BUS mode only and are
accessible only when IRQ indicates valid access.
For loopback operation when this bit is high, the device is configured for digital-to-digital loopback operation. Data on
When high, loopback operation is enabled and the loopback type is governed by the state of the PCM/ANALOG bit.
-
C7
D7
Analog Loopback
7
7
7
C6
-
D6
6
6
6
loopen = 1
D5
C5
5
5
-
5
D4
Figure 8 - Loopback Signal Flows
C4
-
4
4
4
M +/-
HSPKR +/-
ANALOG
PCM/
C3
3
D3
3
3
loopen
D2
C2
2
2
2
Dout
Din
D1
-
C1
1
1
1
PCM/ANALOG = 1
ADDRESS = 07h WRITE/READ VERIFY
D0
C0
-
0
0
0
Digital Loopback
ADDRESS = 05h WRITE/READ
ADDRESS = 06h WRITE/READ
loopen = 1
MT9160B/61B
Power Reset Value
Power Reset Value
1111 1111- write
Power Reset Value
XXXX XXXX - read
1111 1111- write
XXXX XXXX - read
XXXX 0000
HSPKR +/-
92