ASAHI KASEI [AK4114]
MS0098-E-04 2004/03
- 43 -
Burst Preambles in non-PCM Bitstreams
0
16 bits of bitstream
34 781112 27 28 29 30 31
preamble Aux. LSB MSB V U C P
sub-frame of IEC958
015
Pa Pb Pc Pd Burst_payload stuffing
repetition time of the burst
Figure 44. Data structure in IEC60958
Preamble word Length of field Contents Value
Pa 16 bits sync word 1 0xF872
Pb 16 bits sync word 2 0x4E1F
Pc 16 bits Burst info See Table 16
Pd 16 bits Length code Numbers of bits
Table 15. Burst preamble words
ASAHI KASEI [AK4114]
MS0098-E-04 2004/03
- 44 -
Bits of Pc Value Contents Repetition time of burst
in IEC60958 frames
0-4
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16-31
data type
NULL data
Dolby AC-3 data
reserved
PAUSE
MPEG-1 Layer1 data
MPEG-1 Layer2 or 3 data or MPEG-2 without extension
MPEG-2 data with extension
MPEG-2 AAC ADTS
MPEG-2, Layer1 Low sample rate
MPEG-2, Layer2 or 3 Low sample rate
reserved
DTS type I
DTS type II
DTS type III
ATRA C
ATRA C 2/ 3
reserved
4096
1536
384
1152
1152
1024
384
1152
512
1024
2048
512
1024
5, 6 0 reserved, shall be set to “0”
7 0
1
error-flag indicating a valid burst_payload
error-flag indicating that the burst_payload may contain
errors
8-12 data type dependent info
13-15 0 bit stream number, shall be set to “0”
Table 16. Fields of burst info Pc
ASAHI KASEI [AK4114]
MS0098-E-04 2004/03
- 45 -
Non-PCM Bitstream timing
1) When Non-PCM preamble is not coming within 4096 frames,
Pa Pc
1
Pd
1
Pb Pa Pc
2
Pd
2
Pb Pa Pc
3
Pd
3
Pb
“0 Pc
1
Pc
2
“0 Pd
1
Pd
2
Pd
3
Pc
3
PDN pin
Bit stream
AUTO bit
Pc Register
Pd Register
Re
p
etition time >4096 frames
Figure 45. Timing example 1
2) When Non-PCM bitstream stops (when MULK0=0),
Pa Pc
1
Pd
1
Pb Stop Pa Pc
n
Pd
n
Pb
Pc
0
Pc
1
Pd
0
Pd
1
Pd
n
Pc
n
INT0 pin
Bit stream
AUTO bit
Pc Register
Pd Register
INT0 hold time
2~3 Syncs (B,M or W)
<20mS (Lock time)
<Repetition time
Figure 46. Timing example 2

AK4114VQ

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Description:
IC AUDIO DECODER 24BIT 48LQFP
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