Intel® Arria® 10 Hard Processor System Technical Reference Manual

ID 683711
Date 1/10/2023
Public

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4.2.2. Reset Pins

Figure 13. 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 output as well. Any warm reset request causes the reset manager to drive the rst_pin_oe_rst output enable high, which 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); the default is 2048 clocks. This technique can be used to reset external devices (such as external memories) connected to the HPS.