16 Mbit NOR Flash — what the specs mean for a board bring-up
The S25FL116K0XMFI043 is a 16 Mbit NOR Flash from Infineon's FL1-K series, organized as 2M x 8 bits and accessed over a quad-I/O SPI bus at up to 108 MHz. That clock rate translates to a read throughput around 54 MB/s in quad mode — enough for execute-in-place booting of a small RTOS or U-Boot stage from the flash itself without copying to RAM first. The 8-SOIC package (3.90 mm wide, 0.154" pitch) is a common footprint that reworks easily on a four-layer board.