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

ID 683192
Date 5/17/2022
Document Table of Contents Boot Clock

GUIDELINE: Determine boot clock source.

Configure the boot clock, as it influences the boot duration. This choice is primarily determined with the system boot time requirements. The system boot time requirements must take into account how fast the FPGA needs to be configured in order to be responsive and how fast the HPS software must be booted. The HPS software boot speed is influenced by the following factors:
  • Value of external clock to the HPS (i.e. OSC1 clock)
  • Boot flash source interface operational frequency
  • Fuse options

The possible combinations are described in the Intel® Arria® 10 Hard Processor System Technical Reference Manual and are selected with the CSEL pins.

Note: CSEL pins are not used when booting from FPGA fabric.