MSM7617 查看數據表（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

31

DF1

O Tone disabler flag output pin for channel 1.

This pin outputs a disable flag when the ECDM pins are used for tone disabler

mode.

"H": Echo canceler disabled

"L": Echo canceler enabled

32

WDT1

O Not used. Leave this pin open.

38

SYNCO

O Output pin for internal SYNC signal (8 kHz).

This pin is used as the transmit/receive synchronization signal for PCM signals.

Connect it to the SYNC pin and PCM CODEC’s synchronization signal pin. Leave

this pin open if using an external SYNC.

39

SCKO

O Output pin for internal SCK signal (256 kHz).

This pin is used for the transfer clock of PCM signals. Connect it to the PCM

CODEC’s synchronization signal pin. Leave open if using an external SYNC.

40

ECDM0

I Tone disabler control pin common to channel 1 and channel 2.

41

ECDM1

These pins detect answer tones generated by modems (2100 Hz), and then

disable the echo canceler.

ECDM1 ECDM0 Tone Disabler Mode

0

0 Off

0

1 2100 Hz tone detection: On

1

0 2100 Hz and phase reversal detection: On

1

1 Inhibited

42

PWDWN

I Common pin for channel 1 and channel 2.

This pin controls the power-down mode to reduce current consumption

when the device is not being used.

"L": Power down

"H": Normal operation

During power-down mode all input pins are invalid, and output pins will enter

the following states.

Hi-Z: SOUT1, SOUT2, ROUT1, ROUT2

"L": SYNCO, SCKO

Previous state: DF1, WDT1, DF2, WDT2

Reset the device after power-down mode is released.

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