Lattice Radiant: Why does the constraint coverage did not improve after using set_false_path constraint?

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• Lattice Radiant: How do i constraint a path with false path at Pre-Synthesis?

  It is not recommended to constraint from pin to pin in pre-synthesis path thus set_false_path may not be applicable. Instead, use post-synthesis path to do the set_false_path constraint. (use PDC)

• All Nexus / Radiant: Why can't users see reset signals on the timing analysis reports even without setting the set_false_path constraints?

  Resets are not timed or cannot be checked on the timing analysis reports if they are using Global/Set Reset (GSR) component. GSR will be used if the following are set: 1. GSR is instantiated on the RTL and set to the reset signal. 2. GSR-related ...

• Lattice Radiant: How do I achieve 100% timing coverage?

  To achieve 100% timing coverage, you must define the following constraints: 1) create_clock constraint on all your clock ports 2) create_generate_clocks on all nets/pins/ports 3) set_input_delay and set_output_delay on your input and output ports. ...

• How can the user set a false path on my pre-synthesis constraint files (SDC/FDC) between the PLL clock outputs if these are generated in the post-synthesis stage?

  To set this as false_path in pre-synthesis, user need to define the create_generated_clock on the SDC/FDC file as well. Just make sure that the create_generated_clock constraint at the pre-synthesis stage captures all of the properties of the PLL ...

• All Devices: Why does 'set_multicycle_path -hold' constraint is not propagated to Synthesis using Synplify Pro FDC file?

  Description: The issue is present using Radiant 3.1.1 or below on any of the available FPGA devices on the tool. Solution: There is a work around using the Tcl console in the radiant GUI, or if you opt to use the tool from the command line it is even ...