topic Connected module I2s Kinetis slave and Gsm module Master in PCM in Kinetis Microcontrollers

Connected module I2s Kinetis slave and Gsm module Master in PCM

asie — Thu, 11 Jul 2013 11:21:08 GMT

If the Kinetis I2s the module could be connected as Slave Sierra Gsm module is master in pcm.

The waveforms are similar but not exactly the same for that question.
The Fs of kinetis is half clock cycle advance respect to the drawing of the Sierra.

In the file i2s ....... is the drawing that shows the Kinetis Slave mode and file Sierra_pcm this drawing that shows the Sierra.

Question: Is it possible to configure the I2S module of Kinetis for it to work in slave mode gsm module (pcm) Siera Wireless

Best regards

Re: Connected module I2s Kinetis slave and Gsm module Master in PCM

LuisCasado — Thu, 11 Jul 2013 21:51:25 GMT

Hi Joan,

I think it should be ok. The half clock cycle in FS couldn't be a problem. FS is asserted by modem with the clock 'low' and Kinetis figure shows FS asserted when clock is 'high'. But Kinetis will read the bit after falling edge of clock (S18) with modem data valid in the same point and the data valid write by Kinetis will be after falling edge of clock, modem get data in the same point (Tin-hold).

I thin the modem diagram is confusing because is showing firts the bit0 of the previous word, and then the bit 15 of the next word, after FS is asserted.

At least,it is my view.

Best Regards,

Luis,

Re: Connected module I2s Kinetis slave and Gsm module Master in PCM

asie — Fri, 12 Jul 2013 07:04:08 GMT

Thanks for your reply Luis.

We will check the logic analyzer signals and send you the result.

Best regards

Joan