Hard Processor System Technical Reference Manual: Agilex™ 3 SoCs

ID 848530
Date 6/23/2025
Public
Document Table of Contents

8.1. Reset Manager Differences Among Altera® SoC Device Families

The following table shows the differences of the HPS reset manager between various device families.

Table 326.  HPS Reset Manager Differences
Reset Manager Feature

Cyclone® V SoC,

Arria® V SoC

Arria® 10 SoC

Stratix® 10 SoC,

Agilex™ 7

F-Series/I-Series/

M-Series SoC

Agilex™ 5

E-Series/D-Series SoC,

Agilex™ 3

C-Series SoC

Cold reset Sources
  • POR monitor41
  • nPOR pin
  • FPGA fabric
  • FPGA CB 42 and scan manager
  • Software cold reset request
  • Security manager
  • nPOR pin
  • FPGA fabric
  • FPGA CB
  • Software cold reset request
  • SDM
  • HPS cold reset pin 43
  • HPS mailbox request to SDM
  • System watchdogs
  • SDM
  • HPS cold reset pin43
  • HPS or FPGA mailbox request to SDM
  • System watchdogs
Warm reset sources
  • nRST pin
  • FPGA fabric
  • Software warm reset request
  • MPU watchdogs
  • System watchdogs
  • nRST pin
  • FPGA fabric
  • Software warm reset request
  • MPU watchdogs
  • System watchdogs
  • SDM
  • FSBL 44 or software warm reset request
  • System watchdogs
  • (not supported) nRST pin
  • (not supported) FPGA mailbox message to SDM
  • SDM
  • FSBL44 or software warm reset request
  • System watchdogs
  • (not supported) nRST pin
  • (not supported) FPGA mailbox message to SDM
MPU/CPU cold reset ---- ---- COLDMODRST register CPUINRESET register
MPU/CPU warm reset ---- ----
  • MPUMODRST register
  • Software request via RMR_EL3[RR] register
Software request via RMR_EL3[RR] register
Debug reset resources
  • DAP 45 request
  • FPGA fabric
  • DAP request
  • FPGA fabric
  • DAP reset
  • DAP reset
RAM-clearing reset No Yes Handled by SDM Handled by SDM
Anti-tamper reset No Yes Handled by SDM Handled by SDM
41 Power-on reset
42 Control block
43 One of the dedicated SDM I/Os can be configured to work as an HPS cold reset pin
44 First-stage boot loader
45 Debug access port