MSM7581 Ver la hoja de datos (PDF) - Oki Electric Industry

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MSM7581

ITU-T G.721 4ch ADPCM TRANSCODER

Oki Electric Industry 

¡ Semiconductor

MSM7581

(3) PCMÆADPCM, ADPCMÆPCM during Transcode

(a) CODER Timing Diagram

t0

SYXA

SYXP

BCKP

SIP

Internal (1)

Timing (2)

Timing (3)

SOA

1234

MSB

LSB

(b) DECODER Timing Diagram

5678

LSB

PCM Input Data

Tsip

t4

A

104.2ms

119.8ms

MSB

LSB

Tsoa

t1

t2

MSB

t5

SYRA

BCKA

SIA

MSB

LSB

Internal (6)

SYRP

Timing (4)

Timing (5)

SOP

1234

MSB

LSB

MSB

ADPCM Input Data

t6

Tsia

Tsop

t7

B

65.2ms t3

119.8ms

t2

PCM Output Data

* t4 is the falling edge of the 8th BCLK

counted from the rising edge of SYXP.

* t5 is the rising edge of SYXA.

* t6 is the falling edge of the 4th BCLK

counted from the rising edge of SYRA.

* t7 is the rising edge of SYRP.

(c) Internal Circuit Configuration

SIP

SYXP

BCKP

SYRP

SOP

(1)

S

/

8bit Latch To CODER

From CODER Latch 8bit

P

/

P

S

(2)

(3)

(5)

PLL

(4)

P

/

8bit Latch

S

From

DECODER

(6)

To

Latch 8bit

S

/

DECODER

P

SYXA

SOA

SYXA

BCKA

SYRA

SIA

16/18

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