Pcm Configuration; Digital Audio Interface (I²S) - Laird BT800 Series Hardware Integration Manual

BT800-ST Hardware Integration Guide
Version 1.5

8.11 PCM Configuration

Configure the PCM by using PSKEY_PCM_CONFIG32 and PSKEY_PCM_LOW_JITTER_CONFIG (See your PSKey file).
The default for PSKEY_PCM_CONFIG32 is 0x00800000 (for example: first slot following sync is active, 13-bit linear
voice format, long frame sync and interface master generating 256kHz PCM_CLK from 4MHz internal clock with no
tri-state of PCM_OUT).
8.12 Digital Audio Interface (I²S)
The digital audio interface supports the industry standard formats for I²S, left-justified or right-justified. The interface
shares the same pins as the PCM interface, which means each audio bus is mutually exclusive in its usage.
lists these alternative functions.
Table 13: Alternative Functions of the Digital Audio Bus Interface on the PCM Interface.
PCM Interface
PCM_OUT
PCM_IN
PCM_SYNC
PCM_CLK
Configure the digital audio interface using PSKEY_DIGITAL_AUDIO_CONFIG, see BlueCore Audio API Specification
and the PS Key file.
Figure 13: PCM Configuration
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Figure 11 shows the timing diagram.
I²S Interface
SD_OUT
SD_IN
WS
SCK
20
Table 13
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