mt91l61asr1 Zarlink Semiconductor, mt91l61asr1 Datasheet - Page 19

• Manufacturer Part Number: mt91l61asr1
• Description: 3 V Multi-featured Phone Codec With Programmable U/a Law Companding
• Manufacturer: Zarlink Semiconductor

Note: Bits marked "-" are reserved bits and should be written with logic "0"
D-Channel Register
Loopback Register
C-Channel Register
Dout
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). Received D-
looped back to Dout without conversion to the analog domain. However, the receive D/A path (from Din to HSPKR
functions. When low, the device is configured for analog-to-analog operation. An analog input signal at M
SPKR
loopbacks are disabled, the device operates normally and the PCM/ANALOG bit is ignored.
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 Din is
When high, loopback operation is enabled and the loopback type is governed by the state of the PCM/ANALOG bit. When low,
C7
-
D7
7
7
7
Analog Loopback
±
outputs through the A/D and D/A circuits as well as through the normal transmit A/D path (from M
-
C6
6
D6
6
6
loopen = 1
D5
C5
5
5
-
5
D4
Figure 10 - Loopback Signal Flow
C4
-
4
4
4
M +/-
HSPKR +/-
ANALOG
Zarlink Semiconductor Inc.
PCM/
MT91L60/61
C3
D3
3
3
3
loopen
19
C2
D2
2
2
2
Dout
Din
D1
-
C1
1
1
1
PCM/ANALOG = 1 loopen = 1
ADDRESS = 07h WRITE/READ VERIFY
D0
C0
0
0
-
0
Digital Loopback
ADDRESS = 05h WRITE/READ
ADDRESS = 06h WRITE/READ
Power Reset Value
Power Reset Value
1111 1111- write
XXXX XXXX - read
Power Reset Value
1111 1111- write
±
XXXX XXXX - read
±
XXXX 0000
is looped back to the
to Dout).
Data Sheet
HSPKR +/-
±
) still