參數(shù)資料
型號(hào): MSM7581
廠商: OKI SEMICONDUCTOR CO., LTD.
英文描述: ITU-T G.721 4ch ADPCM TRANSCODER
中文描述: ITU - T的G.721 4路差分PcM碼器
文件頁(yè)數(shù): 16/18頁(yè)
文件大?。?/td> 165K
代理商: MSM7581
16/18
Semiconductor
MSM7581
(3) PCM
ADPCM, ADPCM
PCM during Transcode
(a) CODER Timing Diagram
1
2
3
4
5
6
1
2
3
4
7
8
MSB
LSB
MSB
LSB
T
sip
t4
A
PCM Input Data
PCM Output Data
104.2
m
s
119.8
m
s
t1
t2
MSB
LSB
LSB
MSB
t5
T
soa
MSB
LSB
MSB
ADPCM Input Data
T
sia
t6
t7
t3
T
sop
B
65.2
m
s
119.8
m
s
t2
t0
*
*
t5 is the rising edge of SYXA.
*
t7 is the rising edge of SYRP.
SYXA
SYXP
BCKP
SIP
Internal (1)
Timing (2)
Timing (3)
SOA
SYRA
BCKA
SIA
Internal (6)
SYRP
Timing (4)
Timing (5)
SOP
t4 is the falling edge of the 8th BCLK
counted from the rising edge of SYXP.
*
t6 is the falling edge of the 4th BCLK
counted from the rising edge of SYRA.
(b) DECODER Timing Diagram
(c) Internal Circuit Configuration
SIP
SYXP
BCKP
SOP
SOA
SYXA
BCKA
SIA
(1)
8bit
8bit
8bit
To CODER
From
DECODER
To
DECODER
SYXA
From CODER
(2)
(5)
(3)
(4)
(6)
8bit
S
/
P
Latch
P
/
S
Latch
PLL
Latch
S
/
P
P
/
S
Latch
SYRA
SYRP
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