Diamond: How does Timing Analysis use the CLKOFFSET value of the INPUT_SETUP preference?

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• Diamond: Why is the HOLD_OFFSET on the timing report a negative value when using the INPUT_DELAY option on the INPUT_SETUP preference?

  Based on the preferences section of Diamond Help, this is a normal/expected behavior of the timing engine and is seen on the timing reports. INPUT_DELAY is independent of frequency/period and would take the negative of the hold value as the ...

• Diamond: How to add falling clock to INPUT_SETUP constraint/preference in Diamond?

  1. Try using Synplify Pro as the synthesis tool and migrate your LDC file to an SDC file (please put the correct names of the clock, ports, nets, and pins as these might change when changing synthesis tool.) 2. Use INPUT_SETUP preference. This has ...

• What would happen on the timing analysis if user set a negative value on the set_input_delay constraint?

  User can either set the negative value on the -max option or on the -min option: 1. Setting a negative value for the -max option of the set_input_delay: When user set a value of the set_input_delay for the -max option, this applies to the setup ...

• 740 - Lattice ispLEVER: Timing Analysis: What is the I/O Timing Report?

  Lattice ispLEVER: Timing Analysis: The I/O Timing Report (.ior) is a used to report the IO timing analysis of your design. Input Setup and Hold times (Tsu, Th) and Clock-to-Output times (Tco) are reported. The IO Timing Report sweeps across all the ...

• Lattice Diamond: Are the hold window analysis violations observed on the Timing Analysis View valid timing violations? Do users need to make sure that these are passing even though they are not blocking bitstream generation?

  Even though PAR timing did not show any timing violations, users/designers must check the Timing Analysis View for hold window violations. Hold Window analysis is only for boundary paths, i.e. paths involving input or output ports specified with an ...