https://docs.amd.com/v/u/en-US/xapp1313-spartan-spi-config
Spartan-7 FPGA Configuration with SPI Flash and Bank 14 at 1.35V Application Note (XAPP1313) -...
Describes a method for configuring a Spartan-7 FPGA from a 1.8V serial SPI NOR flash memory connected to the FPGA dedicated I/O bank 0 at 1.8V and multi-use...