64 Mbit NOR Flash, Quad SPI at 108 MHz
The S25FL164K0XMFIS11 is a 64 Mbit NOR Flash memory from Cypress's FL1-K series, organized as 8M x 8 bits. The 2.7 V to 3.6 V supply range and -40°C to 85°C operating temperature make it a fit for industrial controllers, outdoor telecom gear, and similar environments where the board sees temperature swings but not extreme heat.
Write-cycle timing and page programming
Page and word write cycles complete in 3 ms typical. That is in line with mainstream serial NOR Flash; it matters for firmware-update routines where the host MCU must wait for the program cycle to finish before issuing the next command. If your update payload is large, the 3 ms page-write time sets the floor for total programming duration.