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SPI link max speed between two STM32 of different families

Question asked by Druart.Sylvain on Jun 22, 2016
Latest reply on Jun 22, 2016 by Clive One
Hi all,

I have two boards which are respectively including an STM32F429 and an STM32F303.
I want to achieve a SPI link between those boards with these following features.
- STM32F429 is master; STM32F303 is slave
- STM32F303 is transmit only; so it never receives anything from the 429.
- Max SPI clock of 429 is 45Mhz
- Max SPI clock of 303 is 18MHz
Simple question:
Is it possible to transmit the data from the 303 to the 429 at 45MHz since the 303 receives its clock signal from the 429 ?
If yes, does it means that the SPI peripherals inside the MCU does not have any mechanism that implies the local clock of the MCU ? Also is it possible that a difference of fabrication tehchnology makes this SPI operation at 45MHz impossible beacause the 303 can not support it in terms of its limiting techno parameters ?

Thanks,

Sylvain

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