參數(shù)資料
型號(hào)： AK4545
廠商： Asahi Kasei Microsystems Co.,Ltd
元件分類： Codec
英文描述： AC97 AUDIO CODEC WITH SRC AND DIT
中文描述： AC97聲音解碼器與SRC和DIT
文件頁(yè)數(shù)： 19/33頁(yè)
文件大?。?/td> 363K
代理商： AK4545
[ASAHI KASEI] [AK4545]
MS0058-E-00
2000/11
- 19 -
c) The Detail of S/PDIF specification
The AK4545 uses two times of bit rate clock, and use bi-phase method except of preamble.
[Architecture of S/PDIF]
Frame formant of S/PDIF is the follwoing.
- One frame consists of two sub-frames.
- One block consists of 192 frames.
- Preamble(B, M, W) for synchronization is added. (see the following figure.)
M
Channel 1
W
Channel2
B
Channel 1
sub-frame
W
Channel 2
sub-frame
M
Channel 1
Channel Coding
Preamble
B
M
W
Preceding symbol : 0
1
1
1
1
1
1
1
1
1
Preceding symbol : 1
0
0
1
0
0
1
0
0
1
0
0
0
1
0
0
0
0
1
0
1
0
0
0
0
0
0
0
0
1
1
1
1
0
1
0
1
1
1
1
Definition of sub-frame( note that audio data format is LSB first)
bit
0
3
7
8 27
L
S
B
28
29
30
31
Contents
Preamble
0
0
0
0
M
S
B
V
U
C
P
V: Valid bit : outputs D15 bit of 70h register
U: User bit : always outputs 0
C: Channel Status bit (refer to 72h, 74h registers. The AK4545 outputs the contents of 72h and 74h registers one
bit per frame. The AK4545 outputs 0 from 33 frame to 191 frame.)
P: Parity bit
note that VUC bits of channel 2 are the same as the ones of Channel 1
Channel Status bits
items
Bits
0
1
2
3
4-5
6-7
8-14
15
16-19
20-23
24-27
28-29
30-191
PRO/consumer
AUDIO#
Copy/Copyright
Pre-emphasis
fixed
Register
Register
Register
fixed
fixed
Register
Register
fixed
fixed
Register
fixed
fixed
“ 0” (consumer mode only )
72h D1
72h D2
72h D3
00
00
72h D8-D14
72h D15
0000
0000
74h D8-D11
00
All 0
Mode
Category CODE
L:Generation Status
Source Num.
Channel Num
Sample Frequency
Clock Accuracy
Reserved
Validity Bit : can be set by D15 bit in 70h register
User Data : all 0
Frame 191
Frame 0
Frame 1
相關(guān)PDF資料
PDF描述
AK4545VQ AC97 AUDIO CODEC WITH SRC AND DIT
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相關(guān)代理商/技術(shù)參數(shù)
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AK4545VQ 制造商:AKM 制造商全稱:AKM 功能描述:AC97 AUDIO CODEC WITH SRC AND DIT
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AK4550VT 制造商:AKM 制造商全稱:AKM 功能描述:LOW POWER & SMALL PACKAGE 16BIT CODEC
AK4550VT-E2 制造商:Asahi Kasei Microsystems Co Ltd 功能描述:
AK4550VTP-E2 制造商:Asahi Kasei Microsystems Co Ltd 功能描述:16BIT 3V
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