9
Audio Interface
The audio interface circuit consists of:
■
Stereo/dual-mono audio codec
■
Dual analogue audio inputs
■
Dual analogue audio outputs
■
3 digital MEMS microphone inputs
■
Configurable PCM (PCM1) and I²S interfaces
Figure 9.1 shows the functional blocks of the interface. The codec supports stereo/dual-mono playback and recording
of audio signals at multiple sample rates with a 16-bit resolution. The ADC and the DAC of the codec each contain
2 independent high-quality channels. Any ADC or DAC channel runs at its own independent sample rate.
G
-TW
-0
007451
.4.3
Stereo / Dual-mono Codec
Memory
Management
Unit
MMU Voice Port
Register Interface
Voice Port
Registers
PCM1
Digital
Audio
Stereo
Audio
Codec
Driver
PCM1 Interface
2 x Differential
DAC Outputs
2 x Differential
ADC Inputs
Digital
MICs
2 x Digital
MICs
Figure 9.1: Audio Interface
The interface for the digital audio bus shares the same pins as the PCM1 codec interface described in Section
9.3. Table 9.1 lists the alternative functions.
Important Note:
The term
PCM
in Section 9.3 and its subsections refers to the PCM1 interface.
PCM Interface
I²S Interface
PCM_OUT
SD_OUT
PCM_IN
SD_IN
PCM_SYNC
WS
PCM_CLK
SCK
Table 9.1: Alternative Functions of the Digital Audio Bus Interface on the PCM1 Interface
Advance Information
This material is subject to CSR's non-disclosure agreement
© Cambridge Silicon Radio Limited 2011
Page 36 of 110
CS-209182-DSP1
CSR8640 BGA
Data Sheet
