Datasheet

VS1053b Datasheet
9 FUNCTIONAL DESCRIPTION
For MP3 files, SCI_HDAT1 is between 0xFFE0 and 0xFFFF. SCI_HDAT1 / 0 contain the follow-
ing:
Bit Function Value Explanation
HDAT1[15:5] syncword 2047 stream valid
HDAT1[4:3] ID 3 ISO 11172-3 MPG 1.0
2 ISO 13818-3 MPG 2.0 (1/2-rate)
1 MPG 2.5 (1/4-rate)
0 MPG 2.5 (1/4-rate)
HDAT1[2:1] layer 3 I
2 II
1 III
0 reserved
HDAT1[0] protect bit 1 No CRC
0 CRC protected
HDAT0[15:12] bitrate see bitrate table
HDAT0[11:10] samplerate 3 reserved
2 32/16/ 8 kHz
1 48/24/12 kHz
0 44/22/11 kHz
HDAT0[9] pad bit 1 additional slot
0 normal frame
HDAT0[8] private bit not defined
HDAT0[7:6] mode 3 mono
2 dual channel
1 joint stereo
0 stereo
HDAT0[5:4] extension see ISO 11172-3
HDAT0[3] copyright 1 copyrighted
0 free
HDAT0[2] original 1 original
0 copy
HDAT0[1:0] emphasis 3 CCITT J.17
2 reserved
1 50/15 microsec
0 none
When read, SCI_HDAT0 and SCI_HDAT1 contain header information that is extracted from
MP3 stream currently being decoded. After reset both registers are cleared, indicating no data
has been found yet.
The “samplerate” field in SCI_HDAT0 is interpreted according to the following table:
“samplerate” ID=3 ID=2 ID=0,1
3 - - -
2 32000 16000 8000
1 48000 24000 12000
0 44100 22050 11025
Version: 1.22, 2014-12-19 45