topic Re: IMX7 SAI1 MCLK in Slave mode in i.MX Processors

IMX7 SAI1 MCLK in Slave mode

frankyhsu — Thu, 16 Feb 2017 11:29:06 GMT

We plan to use SAI1 as the slave mode and codec side is the master mode. But we still want use MCLK to serve the clock to codec. Does it work for this configuration?

Thanks.

Franky.

Re: IMX7 SAI1 MCLK in Slave mode

igorpadykov — Thu, 16 Feb 2017 23:05:10 GMT

Hi Franky

seems not as described in sect.13.8.3.1.1 Audio master clock i.MX7 RM :
The audio master clock is used to generate the bit clock when the receiver or transmitter
is configured for an internally generated bit clock.

http://cache.nxp.com/files/32bit/doc/ref_manual/IMX7DRM.pdf

Best regards
igor
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Re: IMX7 SAI1 MCLK in Slave mode

frankyhsu — Fri, 17 Feb 2017 01:17:55 GMT

Do you mean whatever we use master mode(transmitter) or slave mode (receiver), the MCLK can be a clock output?

Re: IMX7 SAI1 MCLK in Slave mode

sidebranch — Wed, 14 Jun 2017 08:26:12 GMT

I have the same question as the original poster: If the i.MX7 is slave, and the (external) master provides the bitclock (BCLK, configured as input on i.MX7), is it necessary to drive the MCLK on the i.MX7 or can it be unconnected?

If is must be driven, may it be driven with the BCLK?

This is totally unclear from the reference manual.