Connecting TX1 to MEMS mics using PDM line

Hi, in the datasheet it is mentioned that the TX1 has up to 6 PDM channels.
but i cannot find any more information about it.
what pins are used for the PDM data inputs and output clock for the MEMES mics ?
and how do i configure the on board audio codec for this ?

is there any example and code for this ?
thanks