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How is PDM different from I2S and TDM?
PDM-based architecture differs from I2S and TDM in that the decimation filter is in the receiving IC, rather than the transmitting IC. The output of the source is the raw high sample rate modulated data, such as the output of a Sigma-Delta modulator, rather than a decimated data, as it is in I2S.
When to use time division multiplexed ( TDM ) format?
Time division multiplexed (TDM) formats are used when more than two channels of data are to be transferred on a single data line. A TDM data stream can carry as many as sixteen channels of data and has a data/clock configuration similar to that of I2S.
How is the I2S defined for two channels?
I2S is defined for two channels, the word select line (oft called LRCLK) is used to determine which channel the current data belongs to. The best way to achieve it would depend on the hardware you have, so this isn’t really answerable.
What do you need to know about I2S protocol?
The protocol is called I 2 S and comes as a hardware peripheral on many microcontrollers. It’s a surprisingly simple interface that’s quite easy to work with and thus quite hackable, so it’s worth a bit of further investigation.
How many channels can I2S be used for?
I2S is sometimes used to carry multiple channels, particularly between ADC/DAC and CODEC devices. The standard is for two channels, as mentioned by colin in his answer, however you can send multiple datastreams with extra lines.
Where does the data begin in I2S mode?
Classic I2S mode DSP mode packs channel data together in the bit stream (left data followed by right data for each slot) and does not use WS to identify left and right data. In this mode, the data region begins at the leading WS edge for the frame.
How many channels can a flexcomms I2S interface support?
Flexcomms 0 through 5 can be configured as an I2S (Inter-IC Sound) interface for digital audio input or output. Each I2S supports up to four channel-pairs. The overall architecture of an example I2S subsystem is shown in Figure 2.