I2S/TDM Library

vendor:	XMOS
Version:	2.3.0
scope:	General Use
description:	Arithmetic and DSP library
category:	General Purpose
keywords:	Arithmetic, DSP, VPU
devices:	xcore.ai

Overview

This is a software library that allows you to control an I²S or TDM (time division multiplexed) bus via xCORE ports. I²S and TDM are digital data streaming interfaces particularly appropriate for transmission of audio data. The components in the library are controlled via C using the XMOS multicore extensions (xC) and can either act as I²S master, TDM master or I²S slave.

Features

• I²S master, TDM master and I²S slave modes.
• Handles multiple input and output data lines.
• Support for standard I²S, left justified or right justified data modes for I²S.
• Support for multiple formats of TDM synchronization signal.
• Efficient "frame-based" versions of I²S master and slave allowing use of processor cycles in between I2S signal handling.
• Sample rate support up to 192kHz or 384kHz for I²S.
• Up to 32 channels in/32 channels out (depending on sample rate and protocol).

Resource Usage

The I²S and TDM modules use one logical core and between 1.6 and 2.1kB of memory. There may be spare processing time available in the callbacks of I²S and TDM. IO usage is 1 x 1b port for each signal or 4b ports for data in some cases.

Related Application Notes

The following application notes use this library:

• AN00162 - Using the I²S library
• AN02016: Integrating Audio Weaver (AWE) Core into USB Audio
• AN02003: SPDIF/ADAT/I2S Receive to |I2S| Slave Bridge with ASRC

Known Issues

• None

Required Tools

• XMOS XTC Tools: 15.3.0

Required Libraries (dependencies)

• lib_xassert (www.github.com/xmos/lib_xassert)

Support

This package is supported by XMOS Ltd. Issues can be raised against the software at www.xmos.com/support