It communicates over a SPI interface with Quad I/O and QPI support, clocking up to 133 MHz for fast read throughput in execute-in-place (XIP) and firmware-update scenarios.
133 MHz clock and Quad I/O — why the interface speed matters
At 133 MHz in Quad I/O mode, each clock cycle transfers four bits, yielding an effective data rate of 532 Mbps. This is the difference between a sub-second boot and a multi-second wait when loading a firmware image or executing code directly from Flash. The QPI mode further reduces command overhead by encoding all signals on the four I/O lines, which simplifies the host controller's state machine. For designs that already budget a 3.3V supply and a handful of GPIOs for the SPI bus, this part fits without adding a parallel memory controller.
The FL-L series is Infineon's current-generation SPI NOR Flash family, so firmware and hardware investment in this part should have a multi-year procurement horizon.