The driver of the global net must be unlocked from the quadrant location before it can be locked onto a middle global CCC resource. For example, a global net driving a FROM, UJTAG, or CCC macro must be assigned to a chip global.
Action
One of the following:
Unlock the driver of the global net from the quadrant CCC location, and then lock it to a middle global CCC location.
Unlock the driver of the global net from the quadrant CCC location, and run layout again. The clock driver will automatically be assigned to a middle global CCC location during layout.