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CP3SP33SMS/NOPB Datasheet(PDF) 258 Page - Texas Instruments |
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CP3SP33SMS/NOPB Datasheet(HTML) 258 Page - Texas Instruments |
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258 / 407 page  CVSD/PCM Converter 0 CVSDIN0 CVSDOUT0 PCMOUT0 PCMIN0 CVSDIN1 CVSDOUT1 PCMOUT1 PCMIN1 ATDR1 ARDR1 ATDR0 ARDR0 DS447 AAI CVSD/PCM Converter 1 Bluetooth RAM ATDR2 ARDR2 CP3SP33 SNOSCW5 – MAY 2013 www.ti.com Figure 26-2. CVSD/PCM To/From AAI Data Flow The CVSD/PCM modules can operate in two basic modes: fixed-rate mode and free-run mode. In the fixed-rate mode, the clock frequency supplied to CVSD/PCM module 0 on Auxiliary Clock 2 (or Auxiliary Clock 3 for CVSD/PCM module 1) must be exactly 2 MHz. In the fixed-rate mode, the CVSD/PCM module will expect to receive 8000 PCM samples per second on its PCMIN input, and it will produce 4000 words per second on the CVSDOUT output. Each word holds 16 bits of the CVSD-encoded bit stream. It will also expect to receive 16-bit CVSD-encoded data words at a rate of 4000 per second on its CVSDIN input and will produce PCM samples at a rate of 8000 per second on its PCMOUT output. In the free-run mode the Auxiliary Clocks can be set to any frequency up to a maximum equal to the PCLK Clock frequency. In this mode, the CVSD/PCM module will request a new PCM sample every 250 cycles of the Auxiliary Clock, and it will produce a new CVSD data word every 500 cycles of the Auxiliary Clock. The following examples illustrate the flow of CVSD data in typical applications. 26.9.1 Dual CVSD Channels to AAI This model is illustrated in Figure 26-3 and has the following characteristics. • Two bidirectional CVSD channels through the Bluetooth LLC. • PCM data received by the AAI. • CVSD/PCM conversion done on-chip. • PCM audio data is transferred between the AAI and the CVSD/PCM module by means of DMA. • CVSD audio data is transferred between the CVSD/PCM module and the Bluetooth RAM by means of DMA. • CVSD/PCM modules operate in fixed-rate mode using a 2 MHz clock supplied on Auxiliary Clocks 2 and 3. 258 Dual CVSD/PCM Conversion Modules Copyright © 2013, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links :CP3SP33 |
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