Lattice Radiant: Do I need to constrain the LPDDR4 Output ports?

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• Lattice Radiant/Diamond: Do I need to constrain internal paths found on Hard Blocks (Lattice primitives)?

  Timing within hard blocks are already optimized. Paths utilized in the primitive are already consistent hence Ideally there is no need to have them (the paths inside) constrained separately. Users would just need to connect the input/output ports to ...

• 1774 - Diamond: How can the user set the DELAYB cell to add delay to an input port when a single register exists between the input and output ports?

  When only one register is present between the primary input and the primary output ports, that register is automatically placed in the output PIO cell . This prevents the DELAYB cell from being used in the input PIO cell even when user add the DELAYB ...

• Lattice Radiant: How to resolve the issue in generating output bitstream on Radiant's Deployment Tool?

  Description: The user encounters an error on the Deployment tool when trying to convert their generated bitstream from Radiant. Solution: The issue on the generation of output bitstream is due to the encrypted bit file generated by the Radiant's ...

• 2997 - Lattice Diamond: How does the synthesis tool treat the unused input and output ports declared in the RTL code and not used(logic is not being assigned to the IO Ports)?

  The synthesis tool will remove the unused Input ports declared in the design. For unused Output ports, the tool can either tie them to the GND or leave them tri-stated. You can check this in the RTL view of the Synthesis tool. It is recommended to ...

• Lattice Radiant: How do I constrain my Soft DPHY Data lanes?

  You may refer to Section 5.22.2 (DDR Input Setup and Hold Time Constraints) of CrossLink-NX High-Speed I/O Interface Technical Note (FPGA-TN-02097-1.8) while referencing the values found in Section 3.17 (External Switching Characteristics). For ...