sta015t-013tr STMicroelectronics, sta015t-013tr Datasheet - Page 24

• Manufacturer Part Number: sta015t-013tr
• Description: Mpeg 2.5 Layer Iii Audio Decoder With Adpcm Capability
• Manufacturer: STMicroelectronics

STA015 STA015B STA015T
HEAD_M[15:8]
HEAD_L[7:0]
Address: 0x43, 0x44, 0x45 (67, 68, 69)
Type: RO
Software Reset: 0x00
Hardware Reset: 0x00
Head[1:0] emphasis
Head[2] original/copy
Head[3] copyrightHead
[5:4] mode extension
Head[7:6] mode
Head[8] private bit
Head[9] padding bit
Head[11:10] sampling frequency index
Head[15:12] bitrate index
Head[16] protection bit
Head[18:17] layer
Head[19] ID
Head[20] ID_ex
The HEAD registers can be viewed as logically concatenated to store the MPEG Layer III Header content.
The set of three registers is updated every time the synchronisation to the new MPEG frame is achieved
The meaning of the flags are shown in the following tables:
MPEG IDs
Layer
in Layer III these two flags must be set always to "01".
Protection_bit
It equals "1" if no redundancy has been added and "0" if redundancy has been added.
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MSB
MSB
H15
H7
b7
b7
IDex
0
0
1
1
H14
b6
b6
H6
H13
H5
b5
b5
H12
H4
b4
b4
ID
0
1
0
1
H11
H3
b3
b3
H10
H2
b2
b2
MPEG 2.5
reserved
MPEG 2
MPEG 1
H9
H1
b1
b1
LSB
LSB
H8
H0
b0
b0