Arria V Hard Processor System Technical Reference Manual

ID 683011
Date 12/02/2022
Public
Document Table of Contents

4.2.2. Reset Pins

Figure 14. Reset Pins

The test reset (nTRST), test mode select (TMS), and test clock (TCK) pins are associated with the TAP reset domain and are used to reset the TAP controller in the DAP. These pins are not connected to the reset manager.

The nPOR and nRST pins are used to request cold and warm resets respectively. The nRST pin is an open drain output as well. A warm reset drives the nRST pin low. The amount of time the reset manager pulls nRST low is controlled by the nRST pin count field (nrstcnt) of the reset cycles count register (counts). This technique can be used to reset external devices (such as external memories) connected to the HPS.