msm7580 Oki Semiconductor, msm7580 Datasheet - Page 15

• Manufacturer Part Number: msm7580
• Description: Itu-t G.721 Adpcm Transcoder
• Manufacturer: Oki Semiconductor

1Semiconductor
(3) PCMÆADPCM, ADPCMÆPCM during Transcode
(a) CODER Timing Diagram
(b) DECODER Timing Diagram
SYNCA
SYNCP
BCLKP
SIP
Internal (1)
Timing (2)
Timing (3)
SOA
SYNCA
BCLKA
SIA
Internal (6)
SYNCP
Timing (4)
Timing (5)
SOP
(c) Internal Circuit Configuration
SIP
SYNCP
BCLKP
SOP
LSB
LSB
1
MSB
S
P
P
S
/
/
2
8bit
8bit
(1)
3
Latch
Latch
4
To CODER
From
DECODER
(2)
(5)
ADPCM Input Data
MSB
MSB
t0
5
1
6
2
65.2 s
t
t
sip
sia
PLL
t
sop
From CODER
7
3
To
DECODER
104.2 s
SYNCA
119.8 s
119.8 s
8
LSB
LSB
4
LSB
t
t4
t6
(3)
(4)
soa
t7
t3
Latch
Latch
B
8bit
8bit
PCM Input Data
(6)
t1
PCM Output Data
A
P
S
S
P
/
/
t2
t2
MSB
t5
MSB
SOA
SYNCA
BCLKA
SIA
LSB
LSB
* t4 is the falling edge of the 8th BCLK
* t4 is the falling edge of the 8th BCLK
* t5 is the rising edge of SYNCA.
* t7 is the rising edge of SYNCP.
counted from the rising edge of SYNCP.
counted from the rising edge of SYNCP.
MSM7580
15