topic i.mx6 Audio Clock source form clk2_p/n in i.MX Processors

i.mx6 Audio Clock source form clk2_p/n

darrenwang — Thu, 28 Apr 2016 06:18:16 GMT

Can we get the Audio Clk 24.576 MHZ from i.mx6 CLK2_P/CLK2_N?

We want to output the i2s signal for audio dac, but we use an oscillator at i.mx6 pin D5 and pin D5.

Re: i.mx6 Audio Clock source form clk2_p/n

art — Thu, 28 Apr 2016 09:54:29 GMT

First, please note that CLK2_P and CLK2_N are the differential LVDS signals, not a regular logic High/Low signals. Most likely, your audio codec IC does not support the LVDS clock input.

Second, there seems to be no appropriate clock source inside i.MX6 processor (if using regular 24MHz crystal as the clock reference) to generate 24.576MHz frequency.

So, most likely, the answer is: no, it is not possible to use the CLK2_P and CLK2_N pins to output the 24.576MHz clock to an external audio codec.

Have a great day,
Artur

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Re: i.mx6 Audio Clock source form clk2_p/n

darrenwang — Fri, 29 Apr 2016 03:57:45 GMT

Thanks for reply,

i meas i follow the SABRE AI CPU Card schematic.

use 24.576 oscillator with a converter to CLK2_P/N .

then we want to ouput i2s signal as w5/BCLK;V6/DOUT/;U7/LRCLK,

so how can we to configuration the code to do this function?

Thank you.