MachXO2: How to account for frequency tolerance when using the internal OSC?
Workaround 1:
Thus, if you would like to check the oscillator tolerance, you will change the nominal value in your RTL, let MAP and PAR automatically constrain the frequency, and check the PAR Trace. If the design is passing, then it is guaranteed to work between the frequencies.
Workaround 2:
The user can also retain the required frequency in RTL and constrain the frequency to the next highest in Spreadsheet View. Timing Analysis will be done based on the frequency in the constraint.