Intel® Arria® 10 Hard Processor System Technical Reference Manual

ID 683711
Date 8/28/2023
Public
Document Table of Contents

18.6.9.1. Generating a Single Pulse on PPS

To generate single Pulse on PPS: †

  1. Program 11 or 10 (for interrupt) in Bits [6:5], TRGTMODSEL, of Register 459 (PPS Control Register) to instruct the MAC to use the Target Time registers (register 455 and 456) for the start time of PPS signal output. †
  2. Program the start time value in the Target Time registers (register 455 and 456). †
  3. Program the width of the PPS signal output in Register 473 (PPS0 Width Register). †
  4. Program Bits [3:0], PPSCMD, of Register 459 (PPS Control Register) to 0001 to instruct the MAC to generate a single pulse on the PPS signal output at the time programmed in the Target Time registers (register 455 and 456). †

Once the PPSCMD is executed (PPSCMD bits = 0), you can cancel the pulse generation by giving the Cancel Start Command (PPSCMD=0011) before the programmed start time elapses. You can also program the behavior of the next pulse in advance. To program the next pulse: †

  1. Program the start time for the next pulse in the Target Time registers (register 455 and 456). This time should be more than the time at which the falling edge occurs for the previous pulse. †
  2. Program the width of the next PPS signal output in Register 473 (PPS0 Width Register). †
  3. Program Bits [3:0], PPSCMD, of Register 459 (PPS Control Register) to generate a single pulse on the PPS signal output after the time at which the previous pulse is de‑asserted. And at the time programmed in Target Time registers. If you give this command before the previous pulse becomes low, then the new command overwrites the previous command and the EMAC may generate only 1 extended pulse.