How do I select a Universal Control Term? (UCLK, URST, UPST, UOE)
The Universal Control Terms are software (fitter algorithm)
determined. They are not controlled from the design entry
tools by an attribute or other. When these terms will be
used is design dependent.
For example: If a clock is driving a large number of
registers that are spread out across multiple Logic Blocks,
the software will decide if the UCLK would be a better
alternative than a Product Term clock. In this situation
it is very likely the UCLK will be used. The usage of a
UCLK can be verified in the report file.