Cyclone® V Hard Processor System Technical Reference Manual

ID 683126
Date 8/28/2023
Public
Document Table of Contents

4.1.1. HPS External Reset Sources

The following table lists the reset sources external to the HPS. All signals are synchronous to the osc1_clk clock. The reset signals from the HPS to the FPGA fabric must be synchronized to your user logic clock domain.

Table 18.  HPS External Reset Sources

Source

Description

f2h_cold_rst_req_n

Cold reset request from FPGA fabric (active low)

f2h_warm_rst_req_n

Warm reset request from FPGA fabric (active low)

f2h_dbg_rst_req_n

Debug reset request from FPGA fabric (active low)

h2f_cold_rst_n

Cold-only reset to FPGA fabric (active low)

h2f_rst_n

Cold or warm reset to FPGA fabric (active low)

h2f_dbg_rst_n

Debug reset (dbg_rst_n) to FPGA fabric (active low)

load_csr

Cold-only reset from FPGA control block (CB) and scan manager

nPOR

Power-on reset pin (active low)

nRST

Warm reset pin (active low)

nRST and nPOR are powered by the HPS reset and clock input pins power supply (VCCRSTCLK_HPS). For more information on VCCRSTCLK_HPS, refer to the Cyclone V Device Datasheet.