MSM7620 データシートの表示（PDF） - Oki Electric Industry

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MSM7620

Echo Canceler

Oki Electric Industry 

¡ Semiconductor

MSM7620

PIN DESCRIPTIONS (1/5)

Pin

32-pin 64-pin

SSOP QFP

2

1

3

2

4

3

—

4

Symbol

NLP

HCL

ADP

MS

Type

Description

I The control pin for the center clipping function. This forces the SOUT

output to a minimum value (FF) when the SOUT signal is below -54

dBm0. Effective for reducing low-level noise.

• Single Chip or Master Chip in a Cascade Connection

"H": Center clip ON

"L": Center clip OFF

• Slave Chip in a Cascade Connection

Fixed at "L"

This input signal is loaded in synchronization with the falling edge of

the INT signal or the rising edge of the RST signal.

I The through mode control.

When this pin is in the through mode, RIN and SIN data are output to

ROUT and SOUT. At the same time, the coefficient of the adaptive FIR

filter is cleared.

• Single Chip or Master Chip in a Cascade Connection

"H": Through mode

"L": Normal mode (echo canceler operates)

• Slave Chip in a Cascade Connection

Same as master

This input signal is loaded in synchronization with the falling edge of

the INT signal or the rising edge of the RST signal.

I AFF coefficient control pin. This pin stops updating of the adaptive FIR

filter (AFF) coefficient and sets the coefficient to a fixed value, when this

pin is configured to be the coefficient fix mode.

This pin is used when holding the AFF coefficient which has been once

converged.

• Single Chip or Master Chip in a Cascade Connection

"H": Coefficient fix mode

"L": Normal mode (coefficient update)

• Slave Chip in a Cascade Connection

Fixed at "L"

This input signal is loaded in synchronization with the falling edge of

the INT signal or the rising edge of the RST signal.

I Selection of the Master Chip and slave chip when used in a cascade

connection.

"L": Single chip or master chip

"H": Slave chip

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