CP3SP33SMSSLASHNOPB datasheet(233/407 Pages) TI1

233 / 407 page

SCK

STD

DS161

SFS

ACD0

13-bit PCM Data Word

Audio

Control

Bits

16-bit Slot

ACD1

ACD2

D10

D11

D12

CP3SP33

www.ti.com

SNOSCW5 – MAY 2013

24.6.3 Audio Control Data

The audio interface provides the option to fill a 16-bit slot with up to three data bits if only 13, 14, or 15

PCM data bits are transmitted. These additional bits are called audio control data and are appended to the

PCM data stream. The AAI can be configured to append either 1, 2, or 3 audio control bits to the PCM

data stream. The number of audio data bits to be used is specified by the 2-bit Audio Control On (ACO)

field. If the ACO field is not equal to 0, the specified number of bits are taken from the Audio Control Data

field (ACD) and appended to the data stream during every transmit operation. The ADC0 bit is the first bit

added to the transmit data stream after the last PCM data bit. Typically, these bits are used for gain

control, if this feature is supported by the external PCM codec. Figure 24-8 shows a 16-bit slot comprising

a 13-bit PCM data word plus three audio control bits.

Figure 24-8. Audio Slot with Audio Control Data

24.6.4 IOM-2 Mode

The AAI can operate in a special IOM-2 compatible mode to allow to connect to an external ISDN

controller device. In this IOM-2 mode, the AAI can only operate as a slave, i.e., the bit clock and frame

sync signal is provided by the ISDN controller. The AAI only supports the B1 and B2 data of the IOM-2

channel 0, but ignores the other two IOM-2 channels. The AAI handles the B1 and B2 data as one 16-bit

data word.

The IOM-2 interface has the following properties:

•

Bit clock of 1536 kHz (output from the ISDN controller)

•

Frame repetition rate of 8 ksps (output from the ISDN controller)

•

Double-speed bit clock (one data bit is two bit clocks wide)

•

B1 and B2 data use 8-bit log PCM format

•

Long frame sync pulse

Advanced Audio Interface

233

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