MSM7718-01 データシートの表示（PDF） - Oki Electric Industry

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MSM7718-01

Echo Canceler with ADPCM CODEC

Oki Electric Industry 

¡ Semiconductor

MSM7718-01

D7 to D0 (reserved for external memory I/F)

Output of write data, and input-output of read data.

A20 to A0 (reserved for external memory I/F)

External memory address output.

WE (reserved for external memory I/F)

Output for write control .

OE (reserved for external memory I/F)

Output for read control.

CS1, CS2 (reserved for external memory I/F)

Chip select output.

RP (reserved for external memory I/F)

Reset/power-down control output for external memory.

TSTI1, TSTI2, TSTI3, TSTI4

Input for test.

Normally fix these pins to logic “0”.

TSTI4

Input for mode select.

Fix this pin to logic “0” for normal speech mode.

Fix this pin to logic “1” for line echo canceler expansion mode. Refer to the explanation of CR0

for the operation mode.

TSTO

Output for test.

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