Intel® Agilex™ Configuration User Guide

ID 683673
Date 10/29/2021
Public

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3.2.7.1. Understanding Quad SPI Flash Byte-Addressing

At power-on the SDM operates from boot ROM. The SDM loads configuration firmware from Quad SPI flash using 3-byte addressing. Once loaded, if the flash size is 256 Mb or larger, the SDM configures the Quad SPI flash to operate in 4-byte addressing mode and continues to load the rest of the bitstream until configuration completes.

Intel® Agilex™ devices support the following third-party flash devices operating at 1.8 V:
  • Macronix MX66U 512 Mb, 1 and 2 gigabits (Gb)
  • Macronix MX25U 128 Mb, 256 Mb, and 512 Mb
  • Micron MT25QU 128 Mb, 256 Mb, 512 Mb, 1 Gb, and 2 Gb
Micron and Macronix both offer Quad SPI memories with a density range of 128Mb—2Gb.