Needed help in I2S communication.

sri-sri

Hi All,Please forgive for my naive question here. I2S protocal has 4 lines, LRCLK, MCLK, SOUT and SIN lines. OF these LRCLK and MCLK are clock lines.

Assuming that I have interfaced an Audio codec to a DSP chip via i2S line. If I have transmitted Digital data from Audio Codec on SOUT line to DSP chip, what do I receive on Sin line.

1.Some sort of Acknowledgement from the DSP chip

#OR#

2. The processed data from the DSP chip?

Considering: Audio codec as Master and DSP chip as slave.

Please help me in understand this protocol also any advice on reading material related to I2S is much appreciated.

over 10 years ago

0 Diego Melendez over 10 years ago

TI__Guru 57800 points

Hi Sri,

SDIN signal should be the digital audio data from the DSP. The codec receives that data and is able to process it and use it on any analog output. The attached document explains the I2S protocol. These application notes will provide you insight on Audio serial interface configurations with our codecs.

http://www.ti.com/.../slaa469.pdf

Best Regards,

-Diego Meléndez López
Audio Applications Engineer

I2S_BUS.pdf

0 sri-sri over 10 years ago in reply to Diego Melendez

Genius 4140 points

Hi Diego,

Thank you so much for your help. I just want to conform this.

1. If a data is sent on S_out line at time T. [assume that the DSP chip takes time x to process the data ]
2. Then the data that I receive on S_in line at time T+x is the processed data from DSP?

(also at the same time I am sending another frame of data on S_out line).

0 Blake TI Community over 10 years ago in reply to sri-sri

TI__Guru* 92935 points

Thanks Diego for jumping in to help out Sri!

0 Diego Melendez over 10 years ago in reply to Blake TI Community

TI__Guru 57800 points

Hi Sri,

Yes, the DSP processing will add a latency to the audio data you are sending and receiving back.

Best Regards,

-Diego Meléndez López
Audio Applications Engineer

Audio

Audio forum

Needed help in I2S communication.