MSM7617 データシートの表示（PDF） - Oki Electric Industry

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MSM7617

2-Channel Echo Canceler

Oki Electric Industry 

¡ Semiconductor

MSM7617

PIN DESCRIPTIONS (Continued)

Pin

Symbol Type

Description

9

SCK

I Common pin for channel 1 and channel 2. Clock input pin for PCM data

transmission.

Input the same clock as the transmit/receive clock of the PCM CODEC.

Frequencies below 128 kHz cannot be used in serial mode.

10

ECM

I Not used. Fix input to "H".

11

NLP1

I NLP control pin for channel 1.

This pin controls center clipping, forcing SOUT1 output to the minimum

positive value when it is below –54 dBm0. It is effective for reducing

uncancelled echoes and low-level noise.

"H": Center clipping on

"L": Center clipping off

13

SYNC1

I Sync signal input pin for channel 1 transmit/receive PCM data while in 2-

channel parallel I/O mode, 2-channel serial I/O mode, or 1-channel cross-

connected mode.

Input the transmit/receive sync signal (8 kHz) of the PCM CODEC.

14

HCL1

I Echo canceler disable control pin for channel 1.

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 canceler enabled)

15

ADP1

I AFF coefficient control pin for channel 1.

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)

16

RST1

I Reset signal input pin for channel 1.

"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 base clock during reset. Output pins will be placed in the following

states during reset.

Hi-Z: ROUT1, SOUT1

No effect: SYNCO, SCKO, ROUT2, SOUT2, DF2, WDT2

Previous state: DF1, WDT1

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