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K70 I2S signals to SGTL5000

Question asked by Chiranjeev N on Jan 23, 2015
Latest reply on Jan 27, 2015 by xiangjun.rong
Hi,
1) I would like to know why the Power down isolater is used for I2S signals in TWR-AUDIO-SGTL schematic.
since i m designing a board using SGTL5000 Audio codec in which I2S signal is directly driven from K70 processor and clock as well.
2) I would like to confirm using SGTL5000 Audio codec in which I2S signal and clock is directly driven from K70 processor is there is no need of separate crystal to SGTL5000? (it will work fine).please suggest any other has to be taken care while designing above circuit...
3)In k70 Tower kit,I m going to use SD card as well, the card detection will be done by this SD_CARD_PTE28 pin.But i want to understand how its get detected.?( what i understood is when we insert the SD card the respective pin get grounded and GPIO will read as pulldown hence it will get detected.please correct me if i m wrong..

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