DocID028279 Rev 1

5/13

STA1080, STA1085, STA1090, STA1095

System description

13

2.4.1

Audio interfaces

A complete set of audio interfaces is provided, in order to simplify integration with amplifiers,

and input sources. Each interface can be routed to the sound subsystem. A complete list of

audio interfaces is provided below:



Audio ADC

–

Shared between AUX LINE and TUNER LINE

–

ADC Inputs are single ended 3.3 V



Voice ADC

–

Shared among Voice and TEL-IN lines with embedded multiplexer

–

Both Mic and Tel-In lines are differential inputs



Stereo DAC



Multiple I2S IN



Multiple I2S OUT



SPDIF IN for CD/CDROM input with Hardware Block Decoder for CDROM error

correction.

2.4.2

Routing and sample rate converters

Each audio interface can be routed in both directions (IN/OUT) through hardware sample

rate converters, which allow normalizing the sampling rate to the sound processing engine.

The audio routing infrastructure is designed to deliver high quality sample rate conversion

on multiple channels, allowing simultaneous audio streams, such as Bluetooth® Hands

Free and audio media playback, to be handled without CPU load.

2.4.3

Sound DSP

Accordo2 family devices are equipped with multiple DSPs dedicated to sound processing,

fully integrated with the sound subsystem with a specific isochronous bus. DSP is provided

with an integrated sound processing library implementing effects like spatialization,

balancing and equalizer, etc..

2.5

SDMMC

Accordo2 family devices are equipped with SDMMC controllers, which allow interfacing to

either mass storage devices, or to Wi-Fi modules.

2.6

DMA

DMA is designed to efficiently perform memory to memory, and memory to peripherals

transfers, offloading such tasks from the processor, thus reducing interrupt handling load.

DMA provides independent channels which can be dynamically assigned to different data-

path. Complex Scatter/gather transfers can be implemented by programming specific DMA

command linked lists.