2.15 Inter-IC Sound (I
2
S)
The Verdin module features up to two digital audio interfaces in the "Reserved" category. The
interfaces are intended to support the Inter-IC Sound (I
2
S) standard for connecting to an audio
codec on the carrier board or other compatible audio equipment (e.g. HDMI audio, Bluetooth
adapter, DSP etc.). Depending on the Verdin module, the digital audio interfaces may support
additional standards, such as AC’97 or HAD. However, the I
2
S is the preferred standard for
additional compatibility between different Verdin modules.
2.15.1 Digital Audio Signals
The Verdin I
2
S consists of data input, data output, synchronization, and bit clock signal. Each of the
two data signals hold two stereo streams. The synchronization signal is used for identifying
whether the data belongs to the right or left channel and marks the start of each word. In the I
2
S
standard, the sync and clock signal can be generated either by the SoC or the codec. Check in the
module datasheet and in the codec datasheet which direction is supported. Often it is preferred to
have the codec send the bit clock and the sync signal to the SoC.
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