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I2S Digital Audio Component

I2S is a serial link for digital audio. The I2S bus has 3 lines:

• Bit clock or serial clock (BCK)
• Word clock or word select (WCK)
• Data

Each I2S data line carries 2 audio channels (left and right). Additional data lines can be added for more audio channels.

The sc_i2s module can input and output multiple stereo audio streams on multiple ports. Audio samples are sent and received on a streaming channel.

module_i2s_master

This module is a single thread I2S bus master. It can transmit and receive audio data and drives the word clock and bit clock.

It requires the following resources:

• 1 thread (MIPS dependant on number of inputs and outputs)
• 2 clock blocks
• 1 x 1-bit input port for each I2S input plus 1 for MCK
• 1 x 1-bit output port for each I2S output plus 2 for BCK and WCK
• 0.5 kB memory

module_i2s_slave

This module is a single thread I2S bus slave. It can transmit and receive audio data from an external word clock and bit clock.

It requires the following resources:

• 1 thread (MIPS dependant on number of inputs and outputs)
• 1 clock block
• 1 x 1-bit input port for each I2S input plus 2 for BCK and WCK
• 1 x 1-bit output port for each I2S output
• 0.5 kB memory