Datasheet

SRC4392
www.ti.com SBFS029D –DECEMBER 2005–REVISED DECEMBER 2012
Registers 29 through 2C: IEC61937 PC/PD Burst Preamble
The PC and PD burst preambles are part of the IEC61937 standard for transmission of data reduced, non-PCM
audio over a standard two-channel interface (IEC60958). Examples of data-reduced formats include Dolby AC-
3, DTS, various flavors of MPEG audio (including AAC), and Sony ATRAC. The PA and PB preambles provide
synchronization data, and are fixed values of 0xF872 and 0x4E1F, respectively. The PC preamble indicates the
type of data being carried by the interface and the PD preamble indicates the length of the burst, given as
number of bits.
Registers 0x29 through 0x2C contain the PC and PD preambles as decoded by the DIR block.
Register 29: Burst Preamble PC High-Byte Status Register (Read-Only)
Bit 7 (MSB) Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 (LSB)
PC15 PC14 PC13 PC12 PC11 PC10 PC09 PC08
Register 2A: Burst Preamble PC Low-Byte Status Register (Read-Only)
Bit 7 (MSB) Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 (LSB)
PC07 PC06 PC05 PC04 PC03 PC02 PC01 PC00
PC[4:0], Hex Data Type
00 Null
01 Dolby AC-3
02 Reserved
03 Pause
04 MPEG-1 Layer 1
05 MPEG-1 Layer 2 or 3, or MPEG-2 Without Extension
06 MPEG-2 Data With Extension
07 MPEG-2 AAC ADTS
08 MPEG-2 Layer 1 Low Sample Rate
09 MPEG-2 Layer 2 or 3 Low Sample Rate
0A Reserved
0B DTS Type 1
0C DTS Type 2
0D DTS Type 3
0E ATRAC
0F ATRAC2/3
10-1F Reserved
Bits PC[6:5] are both set to 0.
Bit PC[7] is an Error Flag, where: 0 = A valid burst-payload; 1 = Burst-payload may contain errors.
Bits PC[12:8] are data-type dependent.
Bits PC[15:13] indicate the stream number, which is set to 0.
Register 2B: Burst Preamble PD High-Byte Status Register (Read-Only)
Bit 7 (MSB) Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 (LSB)
PD15 PD14 PD13 PD12 PD11 PD10 PD09 PD08
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