CC2564MODN Datasheet, PDF (23/62 Pages) Texas Instruments – Bluetooth Host Controller Interface (HCI) Module

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CC2564MODN, CC2564MODA
SWRS160D – FEBRUARY 2014 – REVISED DECEMBER 2015
5.8.6 Two-Channel Bus Example
Figure 5-8 shows a 2-channel bus in which the two channels have different word sizes and arbitrary
positions in the bus frame. (FT stands for frame timer.)
Clock
FT
127 0 1 2 3 4 5 6 7 8 9
42 43 44
...
... _{127 0}
Fsync
Data_Out
MSB
LSB
bit bit bit bit bit bit bit bit bit bit bit
0 1 2 3 4 5 6 7 8 9 10
MSB
LSB
bit bit bit bit bit bit bit bit
...
0123 4567
Data_In
bit bit bit bit bit bit bit bit bit bit bit
0 1 2 3 4 5 6 7 8 9 10
bit bit bit bit bit bit bit bit
...
0123 4567
PCM_data_window
CH1 data start FT = 0
CH1 data length = 11
CH2 data
start FT = 43
Figure 5-8. 2-Channel Bus Timing
CH2 data
length = 8
Fsync period = 128
Fsync length = 1
twochpcm_swrs064
5.9 Assisted Modes
The TI CC2564MODx module contains an embedded coprocessor that can be used for multiple purposes.
The module uses the coprocessor to perform the LE or ANT functionality. The module also 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 5-1 for the modes of operation supported by the module).
This section describes the assisted HFP 1.6 (WBS) and assisted A2DP modes of operation in the module.
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 in Adopted Bluetooth Core Specifications.
5.9.1 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 5-3.
PARAMETER
Channel mode
Sampling rate
Allocation method
Subbands
Block length
Bitpool
Table 5-3. mSBC Parameters
VALUE
Mono
16 kHz
Loudness
8
15
26
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