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Programming 28022 with SDflash

I need to program 28022 parts with SDflash. I can program them successfully with CCS4 , but not with SDflash running the 40Mhz configuration.

My first question is why doesn't 40Mhz work, since  the 28022 is a 50 Mhz part? The second question is does anyone have the erase, flash and verify algorithms for 50Mhz that they can share?