CP3BT23_14 Datasheet, PDF (179/324 Pages) Texas Instruments – CP3BT23 Reprogrammable Connectivity Processor with Bluetooth and Dual CAN Interfaces

CP3BT23
www.ti.com
SNOSCX3A – JULY 2013 – REVISED JANUARY 2014
19.6.3 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 19-8 shows a 16-bit slot comprising
a 13-bit PCM data word plus three audio control bits.
Bit Shift Clock
(SCK/SRCLK)
Shift Data
(STD/SRD)
D0 D1 D2 D3 D4 D5 D6 D7
Short Frame
Sync Pulse
Long Frame
Sync Pulse
DS156
Figure 19-7. Short and Long Frame Sync Pulses
SCK
SFS
STD D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 ACD2 ACD1 ACD0
13-bit PCM Data Word
Audio
Control
Bits
16-bit Slot
Figure 19-8. Audio Slot with Audio Control Data
DS161
Copyright © 2013–2014, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Links: CP3BT23
Advanced Audio Interface 179