msm7719-01 Oki Semiconductor, msm7719-01 Datasheet - Page 26

• Manufacturer Part Number: msm7719-01
• Description: Echo Canceler With Adpcm Transcoder
• Manufacturer: Oki Semiconductor

¡ Semiconductor
(2) CR1 (Setting of ADPCM operating mode and PCM I/O signals)
B7 … Control of through mode for the ADPCM CODEC
B6 … Transmitter/receiver ADPCM resetting (conforming to G.721)
B5 … Control of through mode for transmit/receive signal (4-bit) through the entire circuit
B4 … Muting of transmitter ADPCM data 1: Mute
B3 … Muting of receiver ADPCM data
B2, B1, B0… Setting of a receiver voice path mute level
CR1
Initial value
0: Normal mode 1: Through mode
This bit is valid when the CONTA pin is set to “0”.
0: Normal mode 1: Through mode
When set to “1”, the device enters the through mode for 4-bit transmit/receive signal through
the entire circuit, and the PCM input and output pins are configured to be 4-bit serial input and
output. All the functions of the echo canceler, ADPCM transcoder, MUTE, and VOX become
invalid. Use this bit when making 32-kbps data communication. Note that 64-kbps data
communication is not supported in this device.
This bit is valid when the MUTE pin is set to “0”.
(MLV2, MLV1, MLV0) =
CONTA
B7
0
ADPCM
RESET
B6
0
DTHR
(0, 0, 0) :
(0, 0, 1) :
(0, 1, 0) :
(0, 1, 1) :
(1, 0, 0) :
(1, 0, 1) :
(1, 1, 0) :
(1, 1, 1) :
B5
0
1: Muting specified by bits B2, B1, and B0 is enabled.
MUTE
B4
TX
0
Through
– 6 dB
–12 dB
–18 dB
–24 dB
–30 dB
–36 dB
MUTE
MUTE
B3
RX
0
MLV2
B2
RX
0
1: Reset
MLV1
B1
RX
0
MSM7719-01
MLV0
B0
RX
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0