The Infineon S25FL128SAGBHI300 is a 128 Mbit SPI Quad I/O NOR flash from the FL-S series, organized 16M x 8 and clocked at 133 MHz. It runs on a 2.7 V to 3.6 V supply and comes in a 24-BGA (6x8 mm) package rated for -40°C to 85°C industrial temperature. This is a non-volatile memory part meant for code shadowing, firmware storage, or data logging in embedded systems where a fast serial interface saves board space over a parallel NOR flash.
133 MHz clock and Quad I/O — what it means for throughput
The SPI Quad I/O interface operates at 133 MHz. This supports execute-in-place for a Cortex-M class MCU without a separate parallel boot flash.