描述

解决方案

When using logic such as a LUT (INV) or even a BUFIO2 to invert a clock, the timing engine has no indication that the clock was inverted. The inverting components are viewed as combinatorial logic, not clock-modifying blocks.

To correct this issue, use local inversion or a clock-modifying block to invert the clock.DCM, DLL, PLL, BUFR, PMCD, and MMCM components are considered to be clock-modifying blocks.