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The 2-Channel Serial Audio Interface:

A Tutorial

INTRODUCTION

It may come as a surprise to those trying to make their initial investigation into audio systems design that there is a

de-facto standard for transferring audio data within a system. Despite the differing naming conventions used within

the industry, these apparently different interfaces are essentially identical. For the sake of simplicity, we will use the

term Serial Audio Interface (SAI) in this discussion. The Serial Audio Interface is by far the most common mecha-

nism used to transfer two channels of audio data between devices within a system; for instance, from the analog-

to-digital converter to the Digital Signal Processor (DSP) and then the digital-to-analog converter, as shown in

Figure 1.

Figure 1 System Block Diagram

Analog-to-Digital Converter Digital-to-Analog Converter

DSP

Left / Right Clock

Serial Clock

Serial DataSerial Data

JUNE '05

AN282REV1

AN282

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Inhaltsverzeichnis

Seite 1 - A Tutorial

Seite 2 - 1.3 Serial Clock

2 AN282REV1AN2821. THE SERIAL AUDIO INTERFACE The Serial Audio Interface is comprised of two control clocks, the Left / Right and Serial Clocks, and t

Seite 3

AN282AN282REV1 32. THE SERIAL AUDIO INTERFACE FORMATS There are several de-facto industry standards or formats that define the required alignments and

Seite 4 - 3. TIME ALIGNMENT

4 AN282REV1AN2822.3 I²S Data FormatThe “Inter-IC Sound” bus (I²S) format was originally developed and standardized by Philips Electronics. The Philips

Seite 5 - AN282REV1 5

AN282AN282REV1 54. IMPLEMENTATIONS OF MORE THAN TWO CHANNELS The Serial Audio Interface can be easily scaled to support larger channel counts simply b

Seite 6 - 5. REVISION HISTORY

6 AN282REV1AN2825. REVISION HISTORYRelease Date ChangesRevision 1 June 2005 Initial ReleaseContacting Cirrus Logic SupportFor all product questions an

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Cirrus-logic AN282 Bedienungsanleitung

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