AK4115 Datasheet, PDF (59/64 Pages) Asahi Kasei Microsystems – High Feature 192kHz 24bit Digital Audio Interface Transceiver

ASAHI KASEI
„ 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
[AK4115]
Pa Pb Pc Pd
Burst_payload
stuffing
repetition time of the burst
Figure 50. Data structure in IEC60958
Preamble word
Pa
Pb
Pc
Pd
Length of field
Contents
16 bits
sync word 1
16 bits
sync word 2
16 bits
Burst info
16 bits
Length code
Table 32. Burst preamble words
Value
0xF872
0x4E1F
see Table 33
numbers of bits
Bits of Pc
0-4
5, 6
7
8-12
13-15
Value
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16-31
0
0
1
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”
Table 33. Fields of burst info Pc
Repetition time of burst
in IEC60958 frames
≤4096
1536
384
1152
1152
1024
384
1152
512
1024
2048
512
1024
MS0573-E-00
- 59 -
2006/12