Please refer the Migration application note from the link given below which describes the differences between FL1-K and FL064L which you need to take in to consideration :
The same code which you used for FL164K might not work for FL064L. There are changes in status and config registers. Refer the above application note for mode details.
Thank you very much for your response. I looked through the document that you recommended and there appears to be a significant amount of differences ! If this is meant to be a replacement chip and since these chips are being used to replace the Altera EPCS\EPCQ - please could you provide more support of how to make this work. Originally Spansion\Cypress provided documents of how to implement their flashes as a replacement for the Altera FLash's. Now that you have made the current Flash "Not Recommended for new designs" and we have to replace it - please could you guide us as to what we need to do to make the replacement work ! The original flash chip worked just fine !
Thank you for all your help in advanced