MSM7580 データシートの表示（PDF） - Oki Electric Industry

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MSM7580

ITU-T G.721 ADPCM TRANSCODER

Oki Electric Industry 

¡ Semiconductor

MSM7580

(3) PCMÆADPCM, ADPCMÆPCM during Transcode

(a) CODER Timing Diagram

t0

SYNCA

SYNCP

BLCKP

12345678

SIP

MSB

LSB

Internal (1)

Timing (2)

Timing (3)

SOA

LSB

Tsip

MSB

(b) DECODER Timing Diagram

PCM Input Data

t4

A

104.2ms

119.8ms

t1

t2

LSB

MSB

Tsoa

t5

SYNCA

BCLKA

SIA

MSB

LSB

Internal (6)

SYNCP

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 SYNCP.

* t5 is the rising edge of SYNCA.

* t6 is the falling edge of the 4th BCLK

counted from the rising edge of SYNCA.

* t7 is the rising edge of SYNCP.

(c) Internal Circuit Configuration

SIP

SYNCP

BCLKP

SOP

(1)

S

/

8bit Latch To CODER

From CODER Latch 8bit

P

/

P

S

(2)

(3)

(5)

PLL

(4)

P

/

S

8bit Latch

From

DECODER

(6)

Latch 8bit

To

DECODER

S

/

P

SYNCA

SOA

SYNCA

BCLKA

SIA

15/17

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