Input clock of clock wizard

[dgottesm]

Hi

When inputting an external clock into the clock wizard, does the input have to be driven by a BUFG, or can it be driven by a simple IBUF

Meaning, is this ok?

[dpaul]

@dgottesm,

Quote

When inputting an external clock into the clock wizard, does the input have to be driven by a BUFG, or can it be driven by a simple IBUF.

Normally not needed as you are feeding the input clock to the clock_wizard(MMCM/PLL). You will see in the above pic that IBUF/BUFG are a part of the clock_wizard IP.

You just do the port mapping in the RTL and let Vivado synthesis engine do the rest.

Yes the above depiction is ok.

 

 

[xc6lx45]

There is also an option on the first wizard page in the "Input clock information" section. It may be slightly hidden, you may need to scroll (Source: "Single ended clock capable").

 

[dgottesm]

18 hours ago, xc6lx45 said:

There is also an option on the first wizard page in the "Input clock information" section. It may be slightly hidden, you may need to scroll (Source: "Single ended clock capable").

 

@xc6lx45

Thanks, I did not notice that set of options. However, it is an external clock, and I am inputting it in a clock capable pin... should/can I still choose global buffer?