Stratix® 10 Configuration User Guide

ID 683762
Date 11/04/2024
Public
Document Table of Contents

3.1.7.4.5. PFL II IP Recommended Constraints for Other Output Pins

Set output delay to PFL II IP output pins

Example below sets the output delay for the pfl_flash_access_request output pin.
  • You don't have to constraint the path when this signal feeds arbiter logic or device tristate logic,
  • You don't have to constraint the path when this signal feeds the pfl_flash_access_granted input pin while not using the device arbiter logic or the external processor.
  • You can constraint the path when this signal feeds the processor or an external device controls.
set_output_delay -add_delay -clock [get_clocks { clk_50m_sysmax }] \
-max $flash_access_request_tracemax [get_ports {pfl_flash_access_request}]

set_output_delay -add_delay -clock [get_clocks { clk_50m_sysmax }] \
-min $flash_access_request_tracemin [get_ports {pfl_flash_access_request}]

Set output delay to flash_nreset output pin

The flash_nreset output pin is available in Burst mode only.

set_output_delay -add_delay -max -clock [get_clocks { FLASH_CLK }] $flash_out_max_dly [get_ports {flash_nreset}]
set_output_delay -add_delay -min -clock [get_clocks { FLASH_CLK }] $flash_out_min_dly [get_ports {flash_nreset}]

Set a false path for fpga_nconfig output pin

You can set the fpga_nconfig output pin to a false path since the nCONFIG is an asynchronous input pin..

set_false_path -from [get_ports {fpga_nconfig}] -to *

Set output delay to pfl_watchdog_error output pin

  • You don't have to constraint the path when the signal feeds the internal logic.
  • You can constraint the path when signal feeds an external host.
set_output_delay -add_delay -clock [get_clocks { clk_50m_sysmax }] \
-max $pfl_watchdog_error_tracemax [get_ports {pfl_watchdog_error}]

set_output_delay -add_delay -clock [get_clocks { clk_50m_sysmax }] \
-min $pfl_watchdog_error_tracemin [get_ports {pfl_watchdog_error}]