FL-L NOR Flash Memory Family Infineon Technologies FL-L NOR Flash Memory Family uses a 65nm process lithography and floating gate technology. The FL-L family connects to a host system via a Serial Peripheral Interface (SPI). The FL-L family supports traditional SPI single-bit (Single I/O or SIO) and optional 2-bit (Dual I/O or DIO). Also, it supports four-bit wide Quad I/O (QIO) and Quad Peripheral Interface (QPI) commands.