Automatically Derived Clock Example - 2024.1 English

Vivado Design Suite User Guide: Using Constraints (UG903)

Document ID
UG903
Release Date
2024-06-15
Version
2024.1 English

The following automatically derived clock example is a clock generated by an MMCM.

The master clock clkin drives the input CLKIN of the MMCME2 instance clkip/mmcm0. The name of the auto-generated clock is cpuClk and its definition point is clkip/mmcm0/CLKOUT.

Figure 1. Auto Generated Clock Example

Tip: Use the get_clocks -of_objects <pin/port/net> command to query an auto-generated clock without knowing its name. This makes your constraint or script independent of the clock name changes.