Hello sanjay jadhav:
There is an application note about using Flex memory in Kinetis devices:
http://cache.freescale.com/files/32bit/doc/app_note/AN4282.pdf
From your comment I assume the board is a FRDM-K20D50M. The MCU on-board is a MK20DX128VLH5. You can download the C90TFS flash driver from this link:
http://cache.freescale.com/files/32bit/software/C90TFS_FLASH_DRIVER.exe
Then once installed you will find an example for MK20DX128xxx5 in this path:
"...\Standard_Software_Driver_v1.03\C90TFS\Demos\build\MK20DX128xxx5"
I hope this helps.
Regards!,
Jorge Gonzalez
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