CC256X Datasheet, PDF (26/51 Pages) Texas Instruments – Bluetooth® Smart Ready Controller

CC256x
SWRS121C – JULY 2012 – REVISED OCTOBER 2013
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Item
L2CAP mode
L2CAP flush
Table 3-14. Miscellaneous Parameters (continued)
Value
Basic mode
Nonflushable
Status
Supported
Supported
For detailed information on the A2DP profile, see the A2DP Profile Specification (www.bluetooth.org/enus/
specification/adopted-specifications).
3.5.4.2.1 Assisted A2DP Sink
The A2DP sink role is the receiver of the audio stream in an A2DP Bluetooth connection. In this role, the
A2DP layer and its underlying layers are responsible for link management and data decoding. To handle
these tasks, two logic transports are defined:
• Control and signaling logic transport
• Data packet logic transport
The assisted A2DP takes advantage of this modularity to handle the data packet logic transport in the
CC256x device by implementing a light L2CAP layer (L-L2CAP) and light AVDTP layer (L-AVDTP) to
defragment the packets. Then the assisted A2DP performs the SBC decoding on-chip to deliver raw audio
data through the CC256x PCM–I2S interface. Figure 3-17 shows the comparison between a common
A2DP sink architecture and the assisted A2DP sink architecture.
A2DP Sink Architecture
Assisted A2DP Sink Architecture
Host Processor
Bluetooth Stack
A2DP
Profile
SBC
PCM
/
I2S
44.1 KHz
48 KHz
16 bits
Audio
CODEC
Host Processor
Bluetooth Stack
A2DP
Profile
Control
AVDTP
L2CAP
Data
Control
AVDTP
L2CAP
HCI
Control Data
HCI
CC256x
Bluetooth Controller
HCI
Control
Data
HCI
PCM
/
I2S
CC256x
Bluetooth Controller ^SBC
L-AVDTP
L-L2CAP
44.1 KHz
48 KHz
16 bits
Audio
CODEC
Figure 3-17. A2DP Sink Architecture Versus Assisted A2DP Sink Architecture
For more information on the A2DP sink role, see the A2DP Profile Specification (www.bluetooth.org/enus/
specification/adopted-specifications).
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