Amazon.com: Waveshare W25QXX DataFlash Board Serial DataFlash Module with Serial NOR Flash Memory W25Q128FV Onboard Support Standard/Dual/Quad SPI/QPI Interface : Electronics
LPC5536 - Octal SPI, PSRAM and I3C - NXP Community
Quad-SPI, Everything You Need To Know! – Embedded Inventor
Bare Metal” STM32 Programming (Part 12): Using Quad-SPI Flash Memory – Vivonomicon's Blog
Serial Peripheral Interface – Master/Slave with Octal, Quad, Dual and Single SPI Bus support
Quad SPI (QSPI) PSRAM SDR in SOP8 Package - AP Memory | Mouser