CC2564C Datasheet, PDF (34/52 Pages) Texas Instruments – CC2564C Dual-Mode Bluetooth Controller

CC2564C
SWRS199A – APRIL 2016 – REVISED NOVEMBER 2016
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The assisted HFP 1.6 mode of operation implements this WBS feature on the embedded CC2564C
coprocessor. That is, the mSBC voice coding scheme and the PLC algorithm are executed in the
CC2564C coprocessor rather than in the host, thus minimizing host processing and power. One WBS
connection at a time is supported, and WBS and NBS connections cannot be used simultaneously in this
mode of operation. Figure 6-15 shows the architecture comparison between the common implementation
of the HFP 1.6 profile and the assisted HFP 1.6 solution.
HFP 1.6 Architecture
Host Processor
HFP1.6
Profile
mSBC
+ PLC
Control
Data
Bluetooth Stack
L2CAP
SCO
PCM
/
I2S
16 kHz
16 bits
Audio
codec
Assisted HFP 1.6 Architecture
Host Processor
HFP1.6
Profile
Control
Bluetooth Stack
L2CAP
HCI
Control Data
HCI
CC256x
Bluetooth Controller
HCI
Control
HCI
CC256x
Bluetooth Controller
mSBC
+ PLC
PCM
/
I2S
16 kHz
16 bits
Data
Audio
codec
Copyright © 2016, Texas Instruments Incorporated
Figure 6-15. HFP 1.6 Architecture Versus Assisted HFP 1.6 Architecture
For detailed information on the HFP 1.6 profile, see the Hands-Free Profile 1.6 Specification
(www.bluetooth.org/en-us/specification/adopted-specifications).
6.4.4.2 Assisted A2DP
The advanced audio distribution profile (A2DP) enables wireless transmission of high-quality mono or
stereo audio between two devices. A2DP defines two roles:
• A2DP source is the transmitter of the audio stream.
• A2DP sink is the receiver of the audio stream.
A typical use case streams music from a tablet, phone, or PC (the A2DP source) to headphones or
speakers (the A2DP sink). This section describes the architecture of these roles and compares them with
the corresponding assisted-A2DP architecture. To use the air bandwidth efficiently, the audio data must be
compressed in a proper format. The A2DP mandates support of the SBC scheme. Other audio coding
algorithms can be used; however, both Bluetooth devices must support the same coding scheme. SBC is
the only coding scheme spread out in all A2DP Bluetooth devices; thus, it is the only coding scheme
supported in the assisted A2DP modes. Table 6-4 lists the recommended parameters for the SBC scheme
in the assisted A2DP modes.
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Detailed Description
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