Hard Processor System Technical Reference Manual: Agilex™ 5 SoCs

ID 814346
Date 4/01/2024
Public
Document Table of Contents

8.7.5.4. HPS Mailbox-triggered Cold Reset

If the cold reset is generated from internal sources (for example, a Mailbox command from the HPS software), the SDM will switch this pin to output and drive a pulse to indicate reset. At this point, referring to the Agilex™ 5 Configuration User Guide, the bitstream configuration file containing the FSBL must be resent to the SDM using the same interface that the MSEL[2:0] pins specified during POR. Once the cold reset procedure is complete, this pin will be switched back to input and can be pulled high by the external pull-up resister. Note that the FPGA will not be disturbed during this process. The following figure shows the HPS Mailbox-triggered cold reset behavior.

Figure 280.  HPS_COLD_nRESET signal behavior (HPS Mailbox-triggered Cold Reset)