AK4112B_12 Datasheet, PDF (26/31 Pages) Asahi Kasei Microsystems – High Feature 96kHz 24bit DIR

„ Burst preambles in non-PCM bitstreams
sub-frame of IEC958
0
34
78
preamble
Aux.
11 12
LSB
0
16 bits of bitstream
27 28 29 30 31
MSB V U C P
15
[AK4112B]
Pa Pb Pc Pd
Burst_payload
repetition time of the burst
stuffing
Preamble word
Pa
Pb
Pc
Pd
Length of field
16 bits
16 bits
16 bits
16 bits
Contents
sync word 1
sync word 2
Burst info
Length code
value
0xF872
0x4E1F
see Table 15.
numbers of bits
Table 14. Burst preamble words
Bits of Pc value
0-4
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16-31
5, 6
0
7
0
1
8-12
13-15
0
contents
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
ATRAC
ATRAC2/3
reserved
reserved, shall be set to “0”
error-flag indicating a valid burst_payload
error-flag indicating that the burst_payload may contain
errors
data type dependent info
bit stream number, shall be set to “0”
repetition time of burst
in IEC958 frames
≤4096
1536
384
1152
1152
1024
384
1152
512
1024
2048
512
1024
Table 15. Fields of burst info Pc
MS0078-E-03
- 26 -
2012/01