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This will be a simulator setting so how you do it will depend on what simulator you are using. What you want to change is the minimum time step that the simulator will recognize. It appears that you are using (perhaps it is the default) a resolution of 'ps' which means that any fractional picoseconds will get truncated, hence 2.3 ps becomes 2 ps. You should be able to change the default time unit to something smaller like femtoseconds (fs) with a command line switch. With Modelsim, this would be done like this "vsim ... -t fs"