The primitives in the following table are different configurations of the clock BUFGCTRL buffers. The Vivado tools manage the configuration of all these primitives, and the Vivado Design Suite User Guide: Using Constraints (UG903) describes the LOC constraint.
| Primitive | Input | Output | Control |
|---|---|---|---|
| BUFGCTRL | I0, I1 | O | CE0, CE1, IGNORE0, IGNORE1, S0, S1 |
| BUFGCE_1 | I | O | CE |
| BUFGMUX | I0, I1 | O | S |
| BUFGMUX_1 | I0, I1 | O | S |
| BUFGMUX_CTRL | I0, I1 | O | S |