We do not have any device like 'S25FS01GS'. We have 'S70FS01GS' device, which is a dual die stack of two S25FS512S die.
Two FS512S devices are stacked within the same package to provide 1 Gb of memory. The two devices share the CS# input to provide a contiguous 1Gb address space.
Here is a link to the datasheet of S70FS01GS - http://www.cypress.com/file/215911/download. You can go through section '12.4 FS01GS Behavior and Software Modifications' for further clarity.
Please let me know if you have any further queries.
Thanks and regards,
Thanks for the clarification. I have component which is labelled as FS01G so I assumed that the prefix is S25 like the other Cypress component we have used (S25FS256).