DIX4192 datasheet(45/71 Pages) TI2

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DIX4192

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SBFS031F – FEBRUARY 2006 – REVISED SEPTEMBER 2016

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9.5.2.2 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.

Figure 64. Register 29: Burst Preamble PC High-Byte Status Register (Read-Only)

7 (MSB)

0 (LSB)

PC15

PC14

PC13

PC12

PC11

PC10

PC09

PC08

Figure 65. Register 2A: Burst Preamble PC Low-Byte Status Register (Read-Only)

7 (MSB)

0 (LSB)

PC07

PC06

PC05

PC04

PC03

PC02

PC01

PC00

Table 33. Register 2A: Burst Preamble PC Low-Byte Status Register (Read-Only) Field Descriptions

PC[4:0], Hex

Data Type

Null

Dolby AC-3

Reserved

Pause

MPEG-1 layer 1

MPEG-1 layer 2 or 3, or MPEG-2 without extension

MPEG-2 Data with extension

MPEG-2 AAC ADTS

MPEG-2 layer 1 low sample rate

MPEG-2 layer 2 or 3 low sample rate

Reserved

DTS type 1

DTS type 2

DTS type 3

ATRAC

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.

Figure 66. Register 2B: Burst Preamble PD High-Byte Status Register (Read-Only)

7 (MSB)

0 (LSB)

PD15

PD14

PD13

PD12

PD11

PD10

PD09

PD08

Figure 67. Register 2C: Burst Preamble PD Low-Byte Status Register (Read-Only)

7 (MSB)

0 (LSB)

PD07

PD06

PD05

PD04

PD03

PD02

PD01

PD00

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