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Participant manb
Participant
271 Views
Registered: ‎02-08-2019

IBUF and IBUFG primitives

Hello 

 

I have following query for IBUF/IBUFG.

1. These are for clock input at FPGA PAD. Do we need to instatiated these or vivado autimatically placed these primitives.?

2. If tool automatically placed these primitives then why we should worry to instantiate these primitives? Because in some documents describes "How to instantiate these primitives".

 

Thanks

Manish 

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2 Replies
Moderator
Moderator
198 Views
Registered: ‎04-18-2011

Re: IBUF and IBUFG primitives

I think it depends on the device family and or the tool flow. 

In newer architectures (7series and later) the tools know to use the dedicated path to the clocking resources from a clock capable IO and there is no need of ibufg... 

 

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Highlighted
187 Views
Registered: ‎01-22-2015

Re: IBUF and IBUFG primitives

@manb 

You will not find IBUFG in the libraries guide (UG953) for 7-Series.

Also, you will not find IBUFG in the libraries guide (UG974) for UltraScale.

Although some documents refer to IBUFG, it appears to be the same as IBUF.

So, for a clock entering the FPGA via a clock-capable pin:

  • if you are instantiating components, then you should instantiate IBUF
  • If you are using the Clocking Wizard, then IBUF will be automatically inferred for you

Mark