ASAHI KASEI
[AK4112A]
n Burst preambles in non-PCM bitstreams
sub-frame of IEC958
0
3
4
7
8
11 12
LSB
27 28 29 30 31
MSB
preamble
Aux.
V U C P
16 bits of bitstream
0
15
Pa Pb Pc Pd
Burst_payload
stuffing
repetition time of the burst
Preamble word
Length of field
16 bits
16 bits
16 bits
16 bits
Contents
value
0xF872
0x4E1F
see Table 15.
numbers of bits
Pa
Pb
Pc
Pd
sync word 1
sync word 2
Burst info
Length code
Table 14. Burst preamble words
Bits of Pc value contents
repetition time of burst
in IEC958 frames
0-4
data type
0
1
2
NULL data
Dolby AC-3 data
reserved
£4096
1536
3
PAUSE
4
MPEG-1 Layer1 data
384
5
6
7
MPEG-1 Layer2 or 3 data or MPEG-2 without extension
MPEG-2 data with extension
reserved
1152
1152
8
9
10
11
12
13
MPEG-2, Layer1 Low sample rate
MPEG-2, Layer2 or 3 Low sample rate
reserved
DTS type I
DTS type II
384
1152
512
1024
2048
DTS type III
14-26 reserved
27
28
(reserved for MPEG-4 AAC data)
MPEG-2 AAC data
512
1024
29-31 reserved
5, 6
7
0
0
1
reserved, shall be set to “0”
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 15. Fields of burst info Pc
MS0020-E-00
2000/3
- 27 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
