Intel® Agilex™ Configuration User Guide

ID 683673
Date 7/05/2022
Public

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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}]

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