About the IO Level

Hi,
the TX1 system-on-module datasheet said the pins with CZ、ST、LV-CZ type. And the CZ can campatiable 1.8V/3.3V
is That True? And As it said ,I2S0/1、SPI2 are CZ pin types. GPIO14、17、 18 are also CZ. So Can I use 3.3V level to connect with these pins?

Yes, CZ pins can compatible 3.3V , but I2S0/1, SPI2, GPIO14/17/18 are all connected to 1.8V in module, so you can not use 3.3V to them.