128 Mbit Quad-SPI NOR flash — what the 104 MHz clock buys you
The S25FL129P0XNFV011 is a 128 Mbit Cypress FL-P series NOR flash memory that communicates over a Quad-SPI interface at up to 104 MHz. That clock rate, combined with the Quad I/O protocol, gives you a read throughput that keeps an ARM Cortex-M or similar MCU fed without waiting on the flash — the 16M x 8 organization maps directly to a linear address space for execute-in-place (XIP) code.
Obsolete — sourcing this part today
Cypress lists the S25FL129P0XNFV011 as obsolete.
8-WSON package and the exposed-pad thermal path
That pad is not just mechanical — it is the primary thermal path out of the die. The write cycle times — 5 µs per word, 3 ms per page — are fast enough for OTA staging or config storage, but repeated back-to-back page writes without a cooldown interval will push the die temperature if the board copper is skimpy.