The eFUSE programming operations require a clock source to be
supplied through either the EMCCLK pin or FUSE_CLK
primitive. See the
Spartan UltraScale+ FPGA Data Sheet: DC and AC Switching
Characteristics (DS930) for
eFUSE programming clock requirements.
Important: The DNA_PORTE2 and the
FUSE_CLK primitives cannot be used in the same design.