Primitive: General Clock Buffer
- PRIMITIVE_GROUP: CLOCK
- PRIMITIVE_SUBGROUP: BUFFER
Introduction
This design element is a high-fanout buffer that connects signals to the global routing resources for low-skew distribution of the signal. BUFGs are typically used on clock nets as well other high-fanout nets like sets, resets, and clock enables.
Port Descriptions
| Port | Direction | Width | Function |
|---|---|---|---|
| I | Input | 1 | Clock input. |
| O | Output | 1 | Clock output. |
Design Entry Method
| Instantiation | Yes |
| Inference | Recommended |
| IP and IP Integrator Catalog | No |
VHDL Instantiation Template
Unless they already exist, copy the following two statements and paste them before the entity declaration.
Library UNISIM;
use UNISIM.vcomponents.all;
-- BUFG: Global Clock Simple Buffer
-- 7 Series
-- Xilinx HDL Language Template, version 2026.1
BUFG_inst : BUFG
port map (
O => O, -- 1-bit output: Clock output
I => I -- 1-bit input: Clock input
);
-- End of BUFG_inst instantiation
Verilog Instantiation Template
// BUFG: Global Clock Simple Buffer
// 7 Series
// Xilinx HDL Language Template, version 2026.1
BUFG BUFG_inst (
.O(O), // 1-bit output: Clock output
.I(I) // 1-bit input: Clock input
);
// End of BUFG_inst instantiation
Related Information
- 7 Series FPGAs Clocking Resources User Guide (UG472)