MSM7617 データシートの表示（PDF） - Oki Electric Industry
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MSM7617 Datasheet PDF : 29 Pages
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¡ Semiconductor
MSM7617
PIN DESCRIPTIONS
Pin
Symbol Type
Description
1
RST2
I Reset signal input pin for channel 2.
"L": Reset
"H": Normal operation
Input signals are invalid for 100 ms after reset (after RST returns to "H"
from "L") for setting initial values.
Input the basic clock during reset. Output pins will be placed in the
following states during reset.
Hi-Z: ROUT2, SOUT2
No effect: SYNCO, SCKO, ROUT1, SOUT1, DF1, WDT1
Previous state: DF2, WDT2
2
ADP2
I AFF coefficient control pin for channel 2.
This pin stops coefficient variation of the adaptive FIR filter (AFF), fixing the
coefficients. It allows once acquired AFF coefficients to be saved.
"H": Fixed coefficient mode
"L": Normal mode (variable coefficients)
3
HCL2
I Echo canceler disable pin for channel 2.
This pin disables the echo canceler and enables data from SIN to SOUT to be output
in "through mode". The input and output levels of SIN and SOUT are changed by the
setting of the SG and SA pins; therefore, to output data from SIN to SOUT in
"through mode", set the SA and SG pins to "0 dB".
It simultaneously clears the adaptive FIR filter coefficients.
"H": Disable mode
"L": Normal mode (echo canceller enabled)
4
SYNC2
I Sync signal input pin for channel 2 transmit/receive PCM data while in
parallel I/O mode.
Input the transmit/receive sync signal (8 kHz) of the PCM CODEC connected
to channel 2. Input "L" if not in parallel I/O mode.
6
NLP2
I NLP control pin for channel 2.
This pin controls center clipping, forcing SOUT2 output to the minimum
positive value when it is below –54 dBm0. It is effective for reducing
uncanceled echoes and low-level noise.
"H": Center clipping on
"L": Center clipping off
7
IOM0
I Sets I/O mode of PCM data.
8
IOM1
IOM1 IOM0 Mode Setting
0
0 2-channel parallel I/O mode
0
1 2-channel serial I/O mode
1
0 1-channel cross-connected mode
1
1 Inhibited
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