| orphan: |
|---|
| vendor: | XMOS |
|---|---|
| version: | 6.0.1 |
| scope: | General Use |
| description: | I²S/TDM controller ("master") and target ("slave") |
| category: | Audio |
| keywords: | Audio, PCM |
| devices: | xcore-200, xcore.ai |
I²S (Inter-IC Sound) is a digital serial protocol developed for transmitting high-quality audio data between components, like microcontrollers, audio codecs, and DSPs. It’s commonly used for PCM (Pulse Code Modulation) audio, which is the standard form for digital audio representation. I²S has three main lines: Serial Data (SD), Serial Clock (SCK) [1], and Word Select (WS) [2], with separate channels for clock and data, reducing jitter and ensuring synchronisation.
In TDM (Time-Division Multiplexing) mode, multiple audio channels can be sent over a single I²S data line, with each channel occupying specific time slots. This allows I²S to support multi-channel audio, useful for applications like surround sound.
lib_i2s allows interfacing to I²S or TDM (time division multiplexed) buses via xcore ports
and can act either act as I²S controller (previously termed master) or target (previously termed
slave) or TDM controller.
| [1] | sometimes refered to as Bit Clock (BCLK) |
| [2] | sometimes refered to as Left/Right(LRCLK) |
- I²S controller, TDM controller and I²S target modes.
- Supports multiple input and output data lines.
- standard I²S, left justified or right justified data modes for I²S.
- Multiple formats of TDM synchronisation signal supported.
- Sample rates up to 384 kHz (TDM limited to 192 kHz).
- Up to 32 channels in/32 channels out (depending on sample rate and protocol).
- I²S target cannot support > 96 kHz on a 4-bit port (#141)
- XMOS XTC Tools: 15.3.0
- lib_xassert (www.github.com/xmos/lib_xassert)
The following application notes use this library:
This package is supported by XMOS Ltd. Issues can be raised against the software at www.xmos.com/support