Hard Processor System Technical Reference Manual: Agilex™ 5 SoCs

ID 814346
Date 11/27/2024
Public
Document Table of Contents

A.2.9.2. Using a Single Flash for both FPGA Configuration and HPS Mass Storage

The QSPI device connected to the SDM can also be accessed directly by the HPS. However, there is a significant speed penalty when doing so. It is up to you to decide whether the speed penalty is acceptable for the end application.

For reference, here are some performance numbers:

  • Maximum HPS read speed from eMMC: 400Mbytes/s
  • Maximum HPS read speed from SD: 100Mbytes/s
  • Maximum HPS read speed from SDM QSPI: 8Mbytes/s

For best performance, Altera recommends using a Flash device connected to HPS for mass storage by HPS.