VS1001K Datasheet, PDF (27/40 Pages) List of Unclassifed Manufacturers – MPEG AUDIO CODEC

VLSI
Solution ^y
DATASHEET
VS1001K
6. FUNCTIONAL DESCRIPTION
6.5.9 HDAT0 and HDAT1 (R)
Bit
HDAT1[15:5]
HDAT1[4:3]
HDAT1[2:1]
HDAT1[0]
HDAT0[15:12]
HDAT0[11:10]
HDAT0[9]
HDAT0[8]
HDAT0[7:6]
HDAT0[5:4]
HDAT0[3]
HDAT0[2]
HDAT0[1:0]
Function
syncword
ID
layer
protect bit
bitrate
sample rate
pad bit
private bit
mode
extension
copyright
original
emphasis
Value
2047
3
2
1
0
3
2
1
0
1
0
3
2
1
0
1
0
3
2
1
0
1
0
1
0
3
2
1
0
Explanation
stream valid
ISO 11172-3 1.0
MPG 2.0 (1/2-rate)
MPG 2.5 (1/4-rate)
MPG 2.5 (1/4-rate)
I
II
III
reserved
No CRC
CRC protected
ISO 11172-3
reserved
32/16/8 kHz
48/24/12 kHz
44/22/11 kHz
additional slot
normal frame
not defined
mono
dual channel
joint stereo
stereo
ISO 11172-3
copyrighted
free
original
copy
CCITT J.17
reserved
50/15 microsec
none
When read, HDAT0 and HDAT1 contain header information that is extracted from MPEG stream being
currently being decoded. Right after resetting VS1001k, 0 is automatically written to both registers,
indicating no data has been found yet.
The “sample rate” field in HDAT0 is interpreted as follows: if the “ID” field in HDAT1 is ’1’, the highest
sample rate is used. If “ID” is ’0’, half sample rate is used. For ’2’ and ’3’, the lowest sample rate is
used.
Note: The sample rate, stereo/mono and bitrate information can more easily be read from register AU-
DATA.
Version 4.14, 2004-02-10
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