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Access to flexspi registers takes 60 ns per instruction

Question asked by Nikolay Iontchev on Aug 14, 2019
Latest reply on Sep 9, 2019 by Kerry Zhou

We are using flexspi bus to read data from FPGA. with iMX RT 600 MHz processor. We have found out the access to the plexspi control registers is very slow. We have measured 60 nano seconds for reads and the same for writing. For example

base->ISR = mask;

takes 60 ns and we would like to know if this is what it takes to communicate from 600 MHz bus to the much slower 150 MHz bus or may be we haven't configured correctly our device?

 

Thank you,

Nik

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