VS1002D Datasheet, PDF (31/54 Pages) List of Unclassifed Manufacturers – MP3 AUDIO CODEC

VLSI
Solution ^y
VS1002d
VS1002D
8. FUNCTIONAL DESCRIPTION
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, SCI HDAT0 and SCI HDAT1 contain header information that is extracted from MP3 stream
being currently being decoded. Right after resetting VS1002d, 0 is automatically written to both registers,
indicating no data has been found yet.
The “sample rate” field in SCI HDAT0 is interpreted according to the following table:
“sample rate”
3
2
1
0
ID=3 / Hz
-
32000
48000
44100
ID=2 / Hz
-
16000
24000
22050
ID=0,1 / Hz
-
8000
12000
11025
The “bitrate” field in HDAT0 is read according to the following table:
Version 1.0, 2005-04-27
31