Cyclone® V Hard Processor System Technical Reference Manual

ID 683126
Date 12/03/2024
Public
Document Table of Contents

16.4.13.1. Taking the Quad SPI Flash Controller Out of Reset

When a cold or warm reset is issued in the HPS, the reset manager resets this module and holds it in reset until software releases it.
  • Cold reset—HPS I/O are in frozen state (tri-state with a weak pull-up). Pin Mux and GPIO/LoanIO Mux are in the default state.
  • Warm reset—HPS I/O retain their configuration. The Pin Mux and GPIO/LoanIO Mux do not change during warm reset, meaning it does not reset to the default/reset value and maintain the current settings. Peripheral IP using the HPS I/O performs proper reset of the signals driving the IO.

After the Cortex®-A9 MPCore CPU boots, it can deassert the reset signal by clearing the appropriate bits in the reset manager's corresponding reset register. For details about reset registers, refer to "Module Reset Signals".