Finally got resolution for this issue. There was a little mismatch of signals happening for Erase command to work with Spansion memory. There is a different set of arguments to had to be passed for Block erase and Full erase. Also CS down duration required for executing commands are also different. There was a piece of code which was changing CS value just after sending of Erase command and thought that Erase is completed. Unlike Read and Write commands, Erase do not notify to calling function. It changes the Busy bit in status register after Erase is successfully completed. So I have inserted polling to check this bit and was able to get desired result. Thanks for your patience and helping. - Bhavesh
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