256 Mbit NOR Flash for code-shadowing and data-logging
The S25FS256SAGBHV200 is a 256 Mbit (32M x 8) NOR Flash memory from Infineon's FS-S series, organized as a single 32M x 8 array and accessed through a SPI Quad I/O or QPI interface at up to 133 MHz. This density suits firmware storage for a Cortex-M or RISC-V application processor where the code image plus a file-system partition fits within 32 MB — common in industrial gateways, programmable logic controllers, and human-machine interfaces that boot from serial NOR and execute in place.
Interface and throughput for the SPI bus
Quad I/O mode drives four data lines simultaneously, pushing the effective read throughput beyond 500 Mbit/s at the 133 MHz clock — enough to feed a high-speed QSPI controller without wait states during code fetch. The 1.7 V supply rail keeps the I/O levels compatible with low-voltage SoC banks, avoiding the need for a separate level translator on the SPI bus.