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Hey All!
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So I looked into TimeQuest, but it appears to need clocks in order to make constraints for the rest of the design. I think no problem, I'll just make the first stage synchronous by adding a clocked process.
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Using Timequest properly assumes that you provide a sdc-file in which you define the timing constraints.
Most import is the clock frequency. It is set per default to 1000MHz, which is rather high.
You can observe the recognized clocks in the Timequest GUI by clicking
Diagnostics -> Report Clocks
Defining your own clock (50MHz for example) in a sdc-file:
create_clock -add -period 20.000 -waveform { 0.000 10.000 } -name think_of_a_pretty_clock_name
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