Master Spi with Two slaves

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Hi, i am using at32uc3a and atmel studio6 for my custom board. Previously i interfaced with one spi slave(atmel flash chips), but i want to add interface for FRAM device.

Interface Details :

Data Flash -> SPI0 -> CS0
FRAM -> SPI0 -> CS1

while doing programming i confused with register settings. For this situation am i go with Fixed peripheral select or Variable peripheral select? if want to select Fixed or Variable then what is a procedure? anyone make me choosing right choice.