AN 763: Intel® Arria® 10 SoC Device Design Guidelines

ID 683192
Date 5/17/2022
Document Table of Contents Selecting QSPI Flash Devices

GUIDELINE: Use QSPI flash with <16 MB for bare-metal applications.

QSPI flash with <16 MB always uses 3-byte addressing that is accessible by the HPS Boot ROM. Thus, when the HPS is reset (cold or warm) there is no need to reset or power cycle the QSPI flash.

For QSPI with >16 MB, consider using QSPI extended 4-byte addressing commands (if applicable).

Some QSPI flash offers extended command set that allows 4-byte addressing to be used without switching to 4 byte-addressing mode. Doing so means that the flash is retained in 3-byte addressing mode, and can be accessed by the Boot ROM on the next reset cycle without needing to reset or power-cycle the QSPI flash.

For more information about QSPI boot, refer to the Arria 10 QSPI Boot Getting Started Guide.