msm7719-01 Oki Semiconductor, msm7719-01 Datasheet - Page 8

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

¡ Semiconductor
CONTA
ADPCM transcoder setting pin. When this pin is set to logic “1”, the transcoder-through mode is
set. In this mode, the IS and IR pins become 8-bit PCM serial input and output pins. Since this pin
is ORed with the control register bit CR1-B7, set CR1-B7 to logic “0” to use this pin.
When this pin control is not used (i.e., when controlling by the control register), set this pin to logic
“0”.
Refer to Figs. 1-5.
DTHR
Through mode setting pin. When this pin is set to logic “1”, the entire circuit is put in the through
mode. In this mode, the PCM input and output pins become 4-bit serial input and output pins and
all functions of the echo canceler, ADPCM transcoder, and MUTEVOX are disabled. Use this pin
when making 32-kbps data communication.
Since this pin is ORed with the control register bit CR1-B5, set CR1-B5 to logic “0” to use this pin.
When this pin control is not used (i.e., when controlling by the control register), set this pin to logic
“0”.
Note that 64-kbps data communication is not supported in this device.
Refer to Figs. 1-5.
SYNCP
BCLKP
CR2-B3, B2
(c)
Output Control
PCMLNO
(a)
(c)
(c)
Input Control
PCMLNI
Line
Echo
Canceler
(27ms)
Echo
Canceler
(54ms)
Acoustic
Echo
Canceler
(27ms)
Figure 1 Signal I/O Control 1
Input Control
PCMACI
Output Control
PCMACO
(a)
Output Control
PCMADO
(b)
IOSL1="0", IOSL0="0"
Control (a): ECMODE, CR0-B0
Control (b): CONTA, CR1-B7
Control (c): DTHR, CR1-B5
Input Control
PCMADI
ADPCM
Transcoder
(b)
Input Control
IR
MSM7719-01
(b)
(c)
Output Control
(b)
IS SYNCA
BCLKA
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