CC2560A Datasheet, PDF (30/52 Pages) Texas Instruments – Dual-Mode Bluetooth Controller

CC2560A NRND; CC2564 NRND
CC2560A, CC2560B, CC2564, CC2564B
SWRS121E – JULY 2012 – REVISED JANUARY 2016
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• Allow overflow: if overflow is allowed, the Bluetooth RX continues receiving data and overwrites any
data not yet sent to the codec.
• Do not allow overflow: if overflow is not allowed, RF voice packets received when the buffer is full are
discarded.
6.4.4 Assisted Modes (CC2560B and CC2564B Devices)
The CC256x device contains an embedded coprocessor that can be used for multiple purposes (see
Figure 1-1). The CC2564 and CC2564B devices use the coprocessor to perform the LE or ANT
functionality. The CC256x device uses the coprocessor to execute the assisted HFP 1.6 (WBS) or
assisted A2DP functions. Only one of these functions can be executed at a time because they all use the
same resources (that is, the coprocessor; see Table 3-1 for the modes of operation supported by each
device).
This section describes the assisted HFP 1.6 (WBS) and assisted A2DP modes of operation in the CC256x
device. These modes of operation minimize host processing and power by taking advantage of the device
coprocessor to perform the voice and audio SBC processing required in HFP 1.6 (WBS) and A2DP
profiles. This section also compares the architecture of the assisted modes with the common
implementation of the HFP 1.6 and A2DP profiles.
The assisted HFP 1.6 (WBS) and assisted A2DP modes of operation comply fully with the HFP 1.6 and
A2DP Bluetooth specifications. For more information on these profiles, see the corresponding Bluetooth
Profile Specification (www.bluetooth.org/en-us/specification/adopted-specifications).
6.4.4.1 Assisted HFP 1.6 (WBS)
The HFP 1.6 Profile Specification adds the requirement for WBS support. The WBS feature allows twice
the voice quality versus legacy voice coding schemes at the same air bandwidth (64 kbps). This feature is
achieved using a voice sampling rate of 16 kHz, a modified subband coding (mSBC) scheme, and a
packet loss concealment (PLC) algorithm. The mSBC scheme is a modified version of the mandatory
audio coding scheme used in the A2DP profile with the parameters listed in Table 6-3.
Channel mode
Sampling rate
Allocation method
Subbands
Block length
Bitpool
PARAMETER
Table 6-3. mSBC Parameters
Mono
16 kHz
Loudness
8
15
26
VALUE
The assisted HFP 1.6 mode of operation implements this WBS feature on the embedded CC256x
coprocessor. That is, the mSBC voice coding scheme and the PLC algorithm are executed in the CC256x
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.
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Detailed Description
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