Hi Prasanna Naik,
1. SDRAM for K22, you can use the flexbus interface
More details, you can refer to this post:
Flexbus and SDRAM Multiplex on K65F_169GBA
And an5095:
http://cache.nxp.com/files/32bit/doc/app_note/AN5095.pdf
2. QSPI for K22
Unfortuntatly, MK22FN512VLL12 doesn't have the QSPI interface, maybe you just can use the SPI interface.
Flex memory is just used for the internal memory, it can't be used to the external memory.
Wish it helps you!
Have a great day,
Kerry
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