Regarding K26P169M180SF5 SPI bus speed:
From the datasheet the maximum SPI frequency (Master mode) is specified for two voltage ranges:
2.7V < Vcc < 3.6V: 30MHz
1.71V< Vcc < 3.6V: 15MHz
For our application, running at 1.8V, this becomes a problem!
What is the limiting factor for the maximum SPI frequency and would it be possible to run the SPI at 30MHz even when Vcc=1.8V?